To find the right proposal !
Internship and thesis proposals
Criteria for selection
Number of proposals
64
1
New quantum sensor concepts for measuring gravity on antihydrogen.
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Metrology
Type of internship
Théorique, numérique Description
For several years now, the Kastler Brossel laboratory has been studying the possibility of using the quantum bounce of an atom, thanks to the Casimir Polder potential, to produce atomic interference and a precise measurement of gravity. Until now, models have neglected surface losses. We want to take them into account and calculate their effect on the interference. This theoretical project will be based mainly on numerical simulations and analytical models.
Contact
Pierre Cladé
15/10/2024
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Thesis :
Funding :
2
Next generation of quantum sensors based on atom interferometry
Domaines
Quantum optics/Atomic physics/Laser
Metrology
Type of internship
Expérimental Description
Atom interferometry is a key tool for developing high-precision quantum sensors. The Kastler Brossel Laboratory is a world leader in this field. Thanks to its work on measuring recoil velocity through atomic interferometry, it has provided the most accurate determination of the fine-structure constant α.
We are offering two experimental internship subjects, each of which could lead to a doctoral thesis.
The first concerns the construction of a large momentum transfer beam splitter on a rubidium atom interferometer.
The second subject concerns the construction of an interferometer using Ytterbium atoms
Contact
Pierre Cladé
15/10/2024
/
Thesis :
Funding :
3
Nano-imaging of non-Fourier heat flow
Domaines
Condensed matter
Hydrodynamics/Turbulence/Fluid mechanics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Efficient heat management is critical for the optimal performance and energy consumption of modern-day electronics. While Fourier’s macroscopic model for heat diffusion has been a valuable tool for homogeneous solids at room temperature, it falls short in describing heat propagation accurately under certain conditions. This PhD project aims to quantitatively investigate scenarios where the Fourier model breaks down and work towards developing a more physically satisfying model of heat propagation. In particular, this project will focus on the phonon viscous hydrodynamic transport regime that has recently attracted considerable interest in the scientific community. It is a regime that is neither ballistic nor diffusive and emerges when quasi-particles interact strongly with each other without loosing momentum.
The goal of this PhD will be to build a very sensitive and local thermometer (based on SQUID technology) so as to map out the temperature distribution at a few tens of nm to look for signatures of this non-Fourier like behaviour.
As a PhD researcher, you will participate in the design, construction and operation of the SQUID based microscope. Enthusiasm for instrumentation is necessary.
The PhD can be funded for 3 years, starting in Fall 2025 (no later than 01/11/2025).
Applications are accepted on an ongoing basis until the position is filled.
Contact
Arthur Marguerite
15/10/2024
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Thesis :
Funding :
4
Emergent quantum computation from the dynamics of complex systems
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Fields theory/String theory
Quantum Machines
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Non-equilibrium Statistical Physics
Type of internship
Théorique, numérique Description
Investigating innovative approaches to analog computing by harnessing the emerging dynamics of quantum systems represents an exciting and modern frontier. This endeavor holds the potential to transform domains such as optimization, machine learning, and simulations by addressing complex problems that classical computers struggle to solve. It introduces a new computational paradigm applicable to fields like optimization, artificial intelligence, and scientific simulations, offering the promise of improving the efficiency and effectiveness of solving intricate real-world challenges.
During this theoretical internship, the Master's student will learn, generalize, and apply methods developed in recent and promising works to explore innovative and advanced strategies for utilizing the intricacies of quantum systems. The goal is to develop emergent computational capabilities, particularly aimed at solving optimization problems and tackling interdisciplinary challenges. The internship’s theoretical research will involve both analytical and numerical methods, with a focus on the quantum many-body physics of state-of-the-art quantum platforms, including superconducting quantum circuits and other quantum systems. This is an internship proposal that can continue into a PhD thesis.
Contact
Cristiano Ciuti
15/10/2024
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Thesis :
Funding :
5
Many-body effects in silicon & germanium spin qubits
Domaines
Condensed matter
Low dimension physics
Quantum information theory and quantum technologies
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Théorique, numérique Description
Silicon & Germanium spin qubits have made outstanding progress in the past few years. In these devices, the elementary information is stored as a coherent superposition of the spin states of an electron or hole in a quantum dot. These spins can be manipulated electrically owing to spin-orbit coupling, and are entangled through exchange interactions, allowing for a variety of one- and two-qubit gates required for quantum computing and simulation. Grenoble is developing original spin qubit platforms on Si and Ge, and holds various records in spin lifetimes and spin-photon interactions. At CEA Grenoble, we support the progress of these advanced quantum technologies with state-of-the-art modelling. In particular, we are developing the TB_Sim code, able to describe very realistic qubit structures down to the atomic scale.
The role of Coulomb interactions in spin qubits remains poorly understood. Quantum dots with 3 to 5 electrons or holes are expected to screen noise & disorder better than singly-occupied ones; yet Coulomb interactions can dramatically reshape the spectrum and dynamics of the system (Wigner localization…). The aim of this master training is, therefore, to model the effects of Coulomb interactions on spin qubits using “configuration interaction” methods for the many-body wave functions, in relation with ongoing experiments in the lab. This Master thesis may be followed by a PhD project on spin manipulation and entanglement in arrays of spin qubits.
Contact
Yann-Michel Niquet
15/10/2024
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Thesis :
Funding :
6
Quantum transport of charge and heat in non-abelian quantum hall states of graphene
Domaines
Condensed matter
Low dimension physics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Even-denominator states of the fractional quantum Hall effect (e.g. 𝜈=5/2) are expected to host excitations that have non-abelian anyonic statistics, corresponding to quantum particles that are neither bosons nor fermions, and the ground state of which changes orthogonally upon exchanging two identical particles. Non-abelian anyons are promising candidates for the realization of topological quantum computing; however, demonstrating the existence of non-abelian statistics is an extremely challenging task, requiring advanced experiments such as interferometry, collisions, and thermal transport measurements. So far, only the latter has been achieved, in only a single system: high-mobility semiconductor GaAs heterostructures. In this project, we propose to implement heat transport and collision experiments, in bilayer graphene, which has recently been shown to host a large number of even-denominator states much more robust than in GaAs, that are thought to be non-abelian. Performing those experiments in bilayer graphene will allow demonstrating the universality of the properties of non-abelian anyons.
This internship, which is planned to be followed by a PhD, involves advanced experimental techniques, including the nanofabrication of ultra-clean bilayer graphene samples in van-der-Waals heterostructures and ultra-high sensitivity thermal and noise measurements at very low temperatures and high magnetic field.
Contact
François Parmentier
14/10/2024
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Thesis :
Funding :
7
Superconducting Devices in Silicon
Domaines
Condensed matter
Low dimension physics
Quantum information theory and quantum technologies
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
The project focuses on the study of superconducting devices with silicon as a semiconductor. Those include standard silicon transistors with superconducting source and drain contacts and superconducting resonators. The common properties is the superconducting material which is elaborated with the constrain of being compatible with the silicon CMOS technology.
In the actual situation of the project, devices with CoSi2, PtSi and Si:B superconducting contacts have been fabricated using the 300 mm clean room facility at the LETI and in collaboration with our partners at Uppsala university and C2N Paris Saclay. The main issue is now to characterize the electronic transport properties at very low temperature. Depending on the quality of the contact interface between the S/D contacts and the silicon channel, various behavior are expected. In the case of opaque contacts, the current at very low S/D bias is blocked due to the opening of the superconducting gap. In the opposite case, superconducting correlations extend in the channel and a gate-tunable non-dissipative supercurrent is expected to flow though the transistors. This situation, met for other materials like germanium (see other master project on protected qubit ), is the ultimate goal of the project.
The master internship will focus on measurements at very low temperature of existing devices.
Contact
François Lefloch
14/10/2024
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Thesis :
Funding :
8
Photonic Crystal Cavities for Terahertz Biosensing
Domaines
Condensed matter
Biophysics
Low dimension physics
Physics of living systems
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Metrology
Type of internship
Expérimental Description
THz waves, typically between 0.1 THz and 10 THz, have great potential for a wide range of biomedical diagnostic applications, as well as for the fundamental study of a variety of biomolecules. Indeed, many biomolecules and biomolecular complexes exhibit relevant intramolecular and intermolecular resonances in this frequency range, paving the way for a wide range of biomedical and diagnostic applications. THz biosensing is therefore a fast-growing field of research. An extraordinary advantage of THz spectroscopy for biological applications is that it enables direct, label-free probing of the interaction of biomolecules with THz radiation.
The aim of this internship is to develop original THz photonic crystal cavities offering a high THz electric field concentration with an ultra-high quality factor, and thus optimized for high-sensitivity THz biosensing. Òur group has recently realized THz cavities providing high electric field confinement with a quality factor of a few tens but limited by the use of metals with ohmic losses. To overcome these limitations, the candidate will realize dielectrically patterned, metal-free, THz photonic crystal cavities that will be further implemented into THz biosensors, to come closer to today's state-of-the-art bioanalytical tools. The candidate will design the photonic crystal cavities using simulations based on finite element method, participate to their fabrication and investigate their optical properties using THz spectroscopy systems.
Contact
Juliette MANGENEY
11/10/2024
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Thesis :
Funding :
9
Semiconductor saturable absorber mirrors for mid-IR fiber and cascade laser combs
Domaines
Condensed matter
Low dimension physics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
Saturation of the light-matter interaction is a general nonlinear feature of materials: atoms or semiconductors. In semiconductors, controlling saturation phenomena is important for fundamental physics and applications. A seminal example is the semiconductor saturable absorption mirror (SESAM), that revolutionized ultra-fast lasers in the vis/near-IR spectral range.
In the mid-IR (lambda=3-30 um), the intensity required for saturation is high, about 1 MW/cm2. This high value explains why SESAM mirrors are missing from the toolbox of mid-IR opto-electronics.
The host team proposed that absorption saturation can be engineered if the system operates in the strong light-matter coupling regime, and provided an experimental proof.
The team designed SESAMs with low saturation intensities: the goal is generating mid-IR frequency combs with tabletop fiber or interband cascade lasers.
The goal of the internship is to develop low-power SESAMs in the mid-IR, supported by recently obtained results, that suit the comb application with fiber and/or cascade lasers. Experiments will be performed by optical pumping with a tunable QC laser in an existing experimental setup.
If time permits, time domain characterizations will be performed with a mid-IR pump/probe setup.
This project evolves in the context of a running ANR grant and of an ERC Advanced grand. It opens up exciting perspectives in the realization of ultrafast, mode-locked mid-IR fiber and semiconductor lasers.
Contact
Raffaele Colombelli
11/10/2024
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Thesis :
Funding :
10
Ultra-fast mid-IR modulators for applications to frequency combs and spectroscopy
Domaines
Condensed matter
Low dimension physics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
Electrically reconfigurable surfaces are artificial components whose optical properties (reflection, absorption) can be addressed electrically. They are particularly useful as amplitude or phase modulators.
In the mid-infrared (MIR, 3um<lambda<30um), these functionalities are useful for applications such as laser phase stabilization, spectroscopy, EO frequency comb generation.
The ultrafast (10–40GHz) modulation of MIR radiation is a missing device functionality. The Host Team is at the forefront of research with a far-reaching approach: the development of electrically reconfigurable surfaces for the MIR.
The Host Team recently demonstrated ultra-fast MIR modulators with performances that are compatible with real world applications.
The specificity (and the beauty) of the concept is that it relies on a fundamental physics phenomenon: the strong-coupling regime between light and matter.
The goal of this internship is: (i) employing the currently existing modulators to generate EO frequency combs, a crucial step for applications. (ii) participate in the full characterization, and result interpretation, of a new generation of modulators with improved functionalities.
The experiments will be performed with the existing setup, built around a tunable quantum cascade laser. The perspective intern will also have the possibility to add improvements to the setup (for instance the measurement of the modulation phase).
Contact
Raffaele Colombelli
11/10/2024
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Thesis :
Funding :
11
Coupling of Josephson currents and magnetization dynamics is S/F hybrids
Domaines
Condensed matter
Type of internship
Expérimental Description
The interplay between superconductivity and magnetism has attracted the attention of physicists for years. The coupling between magnetization dynamics and the superconducting state constitutes a pivotal topic, because of its fundamental interest and its relevance in the nascent field of ”superconducting spintronics”.
The spin dynamics can be excited by ferromagnetic resonance (FMR), particularly by shining microwaves that excite the magnetization precession of the macroscopic-magnetic moment. If the ferromagnet is connected to two superconducting electrodes, and these are close enough, this precession of the magnetization expectedly yields the condition for the generation of unconventional superconducting spin-triplets, thus allowing for Josephson coupling across the ferromagnet. The internship is devoted to experimentally verifying this theoretical prediction, and investigating how spin pumping into the superconductor interplays with Josephson coupling. The existing literature on S/F hybrids most often studies (low-Tc) s-wave superconductors. Instead, here we propose (high-Tc) d-wave ones, which are up to now unexplored in this context and display many unique properties. For example, an anisotropic gap results in a high density of QP (Andreev) bound states at the Fermi level.
This internship and the PhD thesis that should follow will focus on understanding the different mechanisms at play, and the potential of these effects for spintronic applications.
Contact
Javier Villegas
11/10/2024
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Thesis :
Funding :
12
Quantum inspired algorithms meet artificial intelligence
Domaines
Condensed matter
Quantum Machines
Quantum information theory and quantum technologies
Type of internship
Théorique, numérique Description
Quantum computers are expected to change computations as we know it. How are they supposed to do that? Essentially they allow us to perform a subpart of linear algebra (certain matrix-vector multiplications) on exponentially large vectors. A natural mathematical famework to understand what they do is the tensor network formalism. Conversally, tensor networks are becoming popular as tools that can take the place of quantum computers, yet run on perfectly classical hardware. To do so, they rely on a hidden underlying structure of some mathematical problems (a form of intrication) that can be harvested to compress exponentially large vectors into small tensor networks. An increasing number of, apparently exponentially difficult, problems are getting solved this way.
This internship lies at the intersection between theoretical quantum physics and applied mathematics. The goal will be to develop and apply new algorithms to “beat the curse of dimensionality”, i.e. to push the frontier of problems that we are able to access computationally. More specifically, we will explore a new approach to address a class of high dimensional integrals that arise in the context of Feynman diagram calculations [1]. The envisionned algorithms combine the normalization flow approach (from neural networks) with the tensor cross interpolation (from tensor networks).
[1] https://journals.aps.org/prx/abstract/10.1103/PhysRevX.10.041038
Contact
Xavier Waintal
11/10/2024
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Thesis :
Funding :
13
Study of color centers in 2D materials for quantum sensing
Domaines
Condensed matter
Low dimension physics
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
This project aims to overcome these limitations through the design of a new flexible quantum sensor based on an atomically-thin two-dimensional (2D) material. To this end, we will study the magneto-optical properties of recently discovered spin defects in 2D hexagonal boron nitride (hBN) also known as white graphene.
The internship work aims at building a state-of-the-art optical setup to measure quantum properties of color centers in hBN. This will include the development of a Hanbury Brown and Twiss measurement setup to assess the single photon nature of the emitters and the measurement of their spin relaxation and coherence times.
This project makes a bridge between two vibrant fields of research in condensed matter: (i) point defects for quantum technologies and (ii) 2D materials beyond graphene. It is expected to have strong and broad impacts for applied science (printed electronics, spintronics, optoelectronics …) and from the point of view of fundamental physics.
This experimental work will benefit from the state-of-the art facilities and the world-recognized expertise of LPCNO Toulouse for the fabrication of atomically thin materials and their study by advanced optical spectroscopy tools. In particular, the candidate will have the opportunity to work with tunable wavelength lasers, liquid Helium magneto-cryostats and single photon detectors.
Contact
Cedric ROBERT
10/10/2024
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Thesis :
Funding :
14
Magneto-ionic gating in magnetic tunnel junctions
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Magneto-ionics is an emerging field that offers great potential for reducing power consumption in spintronics memory applications through non-volatile gate-control of magnetic properties. By combining voltage-controlled ionic motion from memristor technologies, typically used in neuromorphic applications, with spintronics, magneto-ionics also provides a platform to create a new generation of neuromorphic computing functionalities based on spintronics devices. Our group has been at the forefront of investigating the magneto-ionic control of magnetic properties in various materials and nanodevice geometries. We have demonstrated gating effects on magnetic anisotropy and the Dzyaloshinskii–Moriya interaction and characterised in depth the interactions between the mobile ions and the magnetic atoms.
One major challenge remains ahead for the use of magneto-ionics in practical applications, its integration into magnetic tunnel junctions (MTJ), the building blocks of magnetic memory architectures. This will not only unlock the dynamic control of switching currents in magnetic tunnel junctions to reduce power consumption in memory technologies, but also allow for the modulation of stochastic magnetisation switching, which has important implications in probabilistic computing.
We are currently seeking a highly motivated candidate to join our team at C2N and work on an experimental research project focused on the implementation of magneto-ionic gating schemes in MTJs.
Contact
Liza Herrera Diez
10/10/2024
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Thesis :
Funding :
15
Cavity-enhanced superfluorescence of perovskite nanocrystals superlattices
Domaines
Condensed matter
Low dimension physics
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Since their first synthesis in 2015, perovskite nanocrystals have attracted much attention due to their easy and cheap large-scale fabrication, and excellent optical properties for optoelectronics and quantum optics applications. A key breakthrough occurred in 2018 when superfluorescence was observed in superlattices of CsPbBr3 nanocrystals at low temperatures. Superfluorescence, a phenomenon where emitters synchronize through their long-range interaction and emit a burst of coherent light, had previously been limited to atoms and a few solid-state systems due to the difficulty of obtaining identical individual emitters at high densities within a superstructure. Perovskite nanocrystals, with their narrow size dispersion, provide an ideal material for creating superlattices that can achieve this effect. Integrating these superlattices into optimized optical microcavities is also crucial for enhancing superfluorescence through cavity quantum electrodynamics effects. In the Nano-optics group, a fibered Fabry-Perot microcavity was designed to enhance the emission of solution-processed nanoemitters. The goal of the project is to couple perovskite nanocrystal superlattices to this microcavity and study the superfluorescence in free space and cavity configurations. Enhanced dipole-dipole coupling within the cavity is expected to involve more nanocrystals in the superfluorescence, leading to increased emission.
Contact
Carole Diederichs
09/10/2024
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Thesis :
Funding :
16
Quantum sensing of the 21 cm hydrogen line
Domaines
Condensed matter
Relativity/Astrophysics/Cosmology
Quantum Machines
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Expérimental et théorique Description
The 21 cm hydrogen line is a crucial resource for radioastronomy. The hydrogen element has witnessed many important epochs in the early Universe. The full spectrum of the hydrogen line arising from the red shifted emissions is therefore a highly sought for resource for cosmology and radioastronomy.
In this project which can lead to a PhD, we will use the tools of quantum sensing using superconducting circuits to probe the 21 cm line first for low redshifts and devise techniques to extend this to lower frequencies, suitable for understanding important questions in particular related to dark matter in the early Universe during the Cosmic Dawn.
Contact
Takis Kontos
09/10/2024
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Thesis :
Funding :
17
Etude d’une double source d’atomes froids pour un gyromètre à onde de matière
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum gases
Metrology
Type of internship
Expérimental et théorique Description
La manipulation d’atomes par laser permet de réaliser des interféromètres à onde de matière très sensibles à l’accélération et à la rotation. Il est ainsi possible de réaliser des capteurs extrêmement précis permettant par exemple de déterminer le champ de gravité terrestre ou de réaliser des tests de physique fondamentale. Actuellement, l’ONERA développe une centrale inertielle qui permet de mesurer simultanément les accélérations et les rotations et ainsi de remonter à sa position et son orientation sans utiliser le GPS. Des expériences de laboratoire ont démontré que la technologie quantique était très prometteuse pour ce type d’instrument. Cependant, plusieurs verrous scientifiques et technologiques empêchent actuellement de réaliser un capteur compact et embarquable utilisable en pratique.
Le stage que nous proposons porte sur la levée d’un de ces verrous qui est la réalisation dans un dispositif compact de la double source d’atomes froids nécessaire à une mesure de rotation précise. En particulier, le stagiaire étudiera une technique permettant de séparer en deux un nuage d’atomes froids issu d’un piège magnéto-optique à l’aide de réseaux optiques mobiles. Le stagiaire réalisera dans un premier temps une simulation numérique de l’interaction d’un nuage d’atomes froids avec les lasers, puis participera à sa mise en œuvre sur notre dispositif expérimental. Le stage pourra se poursuivre par une thèse sur le développement d’un gyromètre à atomes froids embarquable.
Contact
Yannick Bidel
08/10/2024
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Thesis :
Funding :
18
Dissipation and Decoherence in a Quantum System
Domaines
Condensed matter
Quantum Machines
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Quantum information theory and quantum technologies
Type of internship
Expérimental Description
http://tiny.cc/QG
What happens to the ground state of a quantum system when we add dissipation? How is the lifetime of excited states affected by dissipation? How is quantum coherence destroyed by dissipation? The student will measure the lifetime and coherence of a bad qubit: a Josephson junction shunted by an on-chip resistance and embedded in a superconducting microwave cavity. The student is expected to aid in the design of devices using microwave simulation software; fabricate samples in a clean room using techniques such as microlithography and electron beam evaporation; cool samples using a cryogen free dilution cryostat; and make sensitive microwave measurements at low temperatures
Contact
Çağlar Girit
08/10/2024
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Thesis :
Funding :
19
High quality superconducting resonators arrays for spin circuit quantum electrodynamics
Domaines
Condensed matter
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Expérimental Description
Quantum computing is currently pushing further the frontier of information technology. Among other fields, solid-state hole-spin qubits are a promising research area. Recently, we reached the strong-coupling regime between the spin of a single hole trapped inside the channel of a silicon transistor and a single microwave photon enclosed in a superconducting resonator [1], realizing a hybrid spin cQED architecture.
The aim of this project is to advance the field of spin cQED by fabricating superconducting resonator arrays made of superconducting thin films of NbN [3,4]. These arrays should allow to study the interaction between one spin and several microwave photonic modes, a first step toward quantum simulation. During the master project, you will participate to the development of new high quality resonators, which includes designing, modelling and measuring them.
Our research team is part of the French national “Plan Quantique” and we strongly collaborate with in-house theory colleagues.
During the master project, you will collaborate on a daily basis with a lively team of three permanent researchers and three PhDs. You will participate to the development of new samples and you will learn to cool down samples to reach cryogenic temperatures. State-of-the-art DC and RF measurements will be used.
[1] Nat. Nano 18, 741, 2023
[2] Phys. Rev. A 75, 032329, 2007
[3] Appl. Phys. Lett. 118, 054001, 2021
[4] arXiv:2403.18150, 2024
Contact
Xavier Jehl
08/10/2024
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Thesis :
Funding :
20
Ultra-strong coupling of a hole spin to a microwave photon
Domaines
Condensed matter
Quantum information theory and quantum technologies
Quantum optics
Type of internship
Expérimental Description
Quantum computing is currently pushing further the frontier of information technology. Among other fields, solid-state hole-spin qubits are a promising research area. Recently, we reached the strong-coupling regime between the spin of a single hole trapped inside the channel of a silicon transistor and a single microwave photon enclosed in a superconducting resonator [1], realizing a hybrid spin cQED architecture.
The aim of this project is to further increase the coupling strength between the hole spin and the microwave photon to reach the ultra-strong coupling regime, a regime of light-matter interaction largely unexplored. First, we will probe this unique quantum system via microwave spectroscopy measurements [2]. In parallel, we will explore how time-domain experiments can unlock the peculiar physics of an ultra-strongly coupled spin to a microwave photon [3, 4].
Our research team is part of the French national “Plan Quantique” and we strongly collaborate with in-house theory colleagues.
During the master project, you will collaborate on a daily basis with a lively team of three permanent researchers and three PhDs. You will participate to the development of new samples and you will learn to cool down samples to reach cryogenic temperatures. State-of-the-art DC and RF measurements will be used.
[1] Nat. Nano 18, 741, 2023
[2] Phys. Rev. A 75, 032329, 2007
[3] Nat. Rev Phys. 1, 19, 219
[4] Rev. Mod. Phys. 91, 025005, 2019
Contact
Xavier Jehl
08/10/2024
/
Thesis :
Funding :
21
Mixed dimensions van der Waals hetero-structures as a plateform for quantum photonics
Domaines
Low dimension physics
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
In recent years, carbon nano-emitters like nanotubes, graphene quantum dots, and nanoribbons have emerged as promising platforms for quantum photonics, particularly in quantum communication and information processing. Their optical properties are versatile, thanks to control over the working wavelength via quantum confinement. Methods such as chemical grafting of color centers in carbon nanotubes and chemically synthesized graphene dots have made these emitters more robust, with room-temperature single-photon emission demonstrated.
However, their performance is often hindered by environmental interactions, leading to dephasing and spectral diffusion. A promising solution is encapsulating nano-emitters in van der Waals heterostructures, which provide an atomically clean environment without needing ultra-vacuum conditions. Conductive 2D materials like graphene also allow for gating, reducing spectral diffusion by screening electrostatic fluctuations.
The research group has developed a cryogenic micro-photoluminescence setup, incorporating super-resolution techniques to map single-photon emitters with sub-wavelength precision (~20 nm). Quasi-resonant excitation spectroscopy further explores confined excited states.
This internship aims to deepen understanding of these heterostructures’ photophysics using advanced spectroscopy, with potential exploration of inter-layer excitons that could lead to new physics phenomena and applications like non-classical light sources.
Contact
Yannick Chassagneux
08/10/2024
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Thesis :
Funding :
22
Deep sub-wavelength dielectric cavities coupled to nano-emitters in the cavity quantum electrodynamics regime.
Domaines
Condensed matter
Quantum information theory and quantum technologies
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
This scientific project focuses on coupling nano-emitters to optical micro-cavities, with potential applications in quantum telecommunication and advanced photonics. One key application is the Purcell effect, which accelerates the spontaneous decay rate and funnels photons into a single optical mode.
The strength of light-matter coupling depends on the ratio of the quality factor to the cavity mode volume. Two approaches exist to optimize this: the plasmonic route, which achieves sub-wavelength mode volumes but suffers from Ohmic losses, and the dielectric resonator route, which attains high Q but is limited by the diffraction limit. This project proposes to combine the strengths of both approaches by designing modified dielectric cavities that achieve high Q with sub-wavelength volumes using near-field techniques.
These cavities will couple with solid-state nano-emitters, such as carbon nanotubes or graphene quantum dots, to create artificial atoms for quantum technology applications. By utilizing the discontinuities of the electric field in a dielectric bow-tie antenna, the project aims to create ultra-small mode volumes. Coupling nano-emitters to these cavities requires spatial and spectral matching, achieved through open-cavities with a mirror on the tip of an optical fiber. The bow-tie antenna will be fabricated on this fiber, and the project focuses on designing, nanofabricating, and testing these antennas.
Contact
Yannick Chassagneux
08/10/2024
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Thesis :
Funding :
23
Edge magnetoplasmon interferometers
Domaines
Condensed matter
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Edge magnetoplasmon are the elementary collective excitations of quantum Hall systems and live on the chiral edge states that carry the current. In a closed loop configuration i.e., a Hall island, the EMPs enter a resonant mode corresponding to the ratio of the velocity and the perimeter of the island. In recent works we have studied such objects and showed that we were able to manipulate their geometric properties so as to influence the resonance condition. We have also made it clear how finite-size effects manifest in this system.
This internship will focus on the next step of this research that aims at realizing a rf interferometer in Hall systems. The experiment is based on the addition of a quantum point contact (QPC) to the structure that would separate the resonators in two lobes contacted through the QPC where quasiparticles exchange can happen. The path of EMPs in each cavity would thus lead to an interference of the signal that would in turn lead to a modulation of the transmission signal as a function of the threaded Aharonov-Bohm flux. The long-term objective of the project is to study anyons in fractional quantum Hall systems using this interferometer.
Contact
Gerbold Ménard
07/10/2024
/
Thesis :
Funding :
24
Delta Kick Squeezing for Atom Interferometry beyond the Standard Quantum Limit
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum gases
Metrology
Type of internship
Expérimental Description
The aim of this intership is the implementation of the "Delta-Kick squeezing" (DKS) technique, which relies on the engineering of atom atom interactions in a BEC in free fall. Such interactions induce strong correlations between the atoms, and lead to squeezing in the population difference between the two interferometer paths, and eventually to phase sensitivity below the standard quantum limit.
Contact
Franck Pereira dos Santos
04/10/2024
/
Thesis :
Funding :
25
On-chip Terahertz Spectroscopy of 2D Materials
Domaines
Condensed matter
Low dimension physics
Nouveaux états électroniques de la matière corrélée
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
In the recent years, the study of 2D materials such as the transition metal dichalcogenides (TMD) has led to the discovery of novel quantum states of matter. However, the fabrication of these materials often leads to small samples (~um) which can limit the range of tools used for their study and applications. This is the case of terahertz (THz) spectroscopy which, though limited by diffraction (~300 um), would be a powerful tool because the THz frequency range lies in the same energy range as many electronic excitations in these quantum materials.
In this Master project, we propose to develop a method to perform spectroscopy on micrometer scale 2D materials beyond the current diffraction limitation of standard THz spectroscopy. This new technique uses “on-chip” generation and detection of THz pulses and will allow the candidate to study NbSe2, an exotic SC hosting simultaneously SC and a charge-density-wave (CDW) state. NbSe2 samples will be progressively exfoliated and measured down to the ultimate monolayer 2D limit. These already unprecedented results will pave the way for a PhD thesis for which the candidate will implement pump-probe “on-chip” THz spectroscopy, investigating the dynamics and interaction of the Higgs and CDW modes when driven far away from equilibrium and the possibility of inducing long-lived metastable SC states in this system.
Contact
Romain Grasset
Laboratory : Laboratoire des solides irradiés - UMR 7642
Team : New electronic states - TeraX-lab
Team Website
Team : New electronic states - TeraX-lab
Team Website
04/10/2024
/
Thesis :
Funding :
26
Mesoscopic quantum electrodynamics with spins in carbon nanotubes
Domaines
Condensed matter
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Expérimental Description
The HQC group recently demonstrated the manipulation, with cavity photons, of quantum states in a carbon nanotube (CNT) with coherence time of the order of 1.3μs. This is 2 orders of magnitude larger than any previous implementation of spin qubits with CNT and 1 order of magnitude larger than similar device using silicon.
The proposed internship, and following PhD, aims at pushing these recent results further to demonstrate a high single-qubit gate fidelity above the fault-tolerant threshold for quantum error correction codes (and go to two-qubit gates). The strategy will rely on electrically tuning the spin qubit to further improve its coherence time (expected to be between 5μs and 25μs), boosting the spin-photon coupling with high-kinetic inductance microwave resonators and exploiting novel electron-photon coupling schemes that are currently being demonstrated in the group. The candidate will benefit from the interaction with all members of the group and of the fruitful partnership we have with the startup C12 which can then offer a CIFRE PhD funding.
The candidate should have a strong theoretical background in quantum and condensed matter physics, a strong interest in nano-devices and complex microwave techniques to manipulate a quantum system in the time domain.
Contact
Matthieu Delbecq
04/10/2024
/
Thesis :
Funding :
27
Bringing a cold-atom interferometer to the quantum noise detection limit
Domaines
Quantum optics/Atomic physics/Laser
Quantum information theory and quantum technologies
Quantum gases
Metrology
Type of internship
Expérimental Description
Cold atom inertial sensors have many applications in fundamental physics (testing the laws of gravitation, gravitational astronomy), geosciences (measuring the Earth's gravity field or rotation) and inertial navigation. The operation of these sensors is based on atomic interferometry, taking advantage of superpositions between quantum states of different momentum in an atom, generated by optical transitions with two (or more) photons. To broaden their range of applications, it is necessary to constantly push back their performance in terms of sensitivity, stability, precision, dynamic range, compactness or robustness, ease of use and cost. The aim of this Master project will be to study and improve our state-of-the-art SYRTE's cold atom gyroscope by one order of magnitude compared with the current state of the art to reach the interferometer's detection limit, which is intrinsically linked to quantum projection noise. It will use new methods like successive joint measurements without dead time. Obtaining this regime requires some modifications to the existing experiment, in particular to the Raman lasers used to manipulate the atomic wave packet, but also to the preparation and the detection of the atomic samples. This method is very general and could also be applied to more common three-pulse interferometers such as accelerometers and gravimeters.
Contact
Arnaud Landragin
04/10/2024
/
Thesis :
Funding :
28
Spin-photon interfaces for quantum entanglement & quantum logic operations
Domaines
Condensed matter
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
This project aims at demonstrating new forms of spin-photon entanglement and photon-photon entanglement, and develop logic gates mediated by the spin-photon interaction, using cavity-QED devices based on semiconductor quantum dots.
Contact
Loïc Lanco
04/10/2024
/
Thesis :
Funding :
29
Quantum computing with nuclear spins
Domaines
Condensed matter
Quantum Machines
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Expérimental Description
This project aims at developing a novel quantum computing platform, based on individual nuclear spin qubits at 10mK interfaced by superconducting quantum circuits
Contact
Patrice Bertet
03/10/2024
/
Thesis :
Funding :
30
Single-molecule magnetic resonance spectroscopy
Domaines
Condensed matter
Biophysics
Quantum Machines
Quantum information theory and quantum technologies
Quantum optics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Expérimental Description
This project aims at performing magnetic resonance spectroscopy at the single molecule level, using superconducting quantum technologies.
Contact
Patrice Bertet
03/10/2024
/
Thesis :
Funding :
31
Spin control of single fluorescent defects in silicon
Domaines
Condensed matter
Quantum information theory and quantum technologies
Type of internship
Expérimental Description
This project aims at investigating fluorescent point defects in silicon emitting in the near-infrared telecom bands, for the development of integrated photonic circuits for quantum technologies in silicon.
Contact
Guillaume CASSABOIS
03/10/2024
/
Thesis :
Funding :
32
Emergent properties of altermagnets and non-collinear antiferromagnets
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
This project aims at investigating complicated magnetic textures beyond ferromagnets and antiferromagnets, for the emergence of new phenomena like orbital magnetization or anomalous Hall effect in nanomagnetic systems.
Contact
Guillaume CASSABOIS
03/10/2024
/
Thesis :
Funding :
33
Controlling artificial atoms with light in hexagonal boron nitride
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
This project aims at investigating the photo-assisted activation of impurities in hexagonal boron nitride for the creation of artificial atoms for quantum technologies, and for classical applications where doping is required.
Contact
Guillaume CASSABOIS
03/10/2024
/
Thesis :
Funding :
34
Superradiance of optical phonons in hexagonal boron nitride
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
While phonons are usually considered only as a dissipative reservoir, the objective of this project is to observe the luminescence of 2D optical phonons, and to study their superradiance in superlattices of boron nitride.
Contact
Guillaume CASSABOIS
03/10/2024
/
Thesis :
Funding :
35
Quantum sensing with spin defects hosted in a two-dimensional material
Domaines
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
This project will be focused on the study of the spin and optical properties of the recently discovered boron vacancy defect in boron nitride, in order to assess its potential for quantum sensing applications, with a focus on magnetic field and electric field detection.
Contact
Guillaume CASSABOIS
03/10/2024
/
Thesis :
Funding :
36
Lossless resilient microwave components based on disordered superconductors
Domaines
Condensed matter
Type of internship
Expérimental Description
uperconducting quantum circuits, particularly in the circuit Quantum ElectroDynamics (cQED) architecture, have achieved significant progress in recent decades. In this architecture, quantum signals are carried by microwave photons. Most cQED experiments rely on aluminum Josephson Junctions (JJ's), which act as non-linear inductors. This non-linearity enabled the development of crucial non-linear lossless microwave components, such as tunable resonators and low-noise amplifiers, essential for cQED. However, aluminum JJ-based components are limited to low magnetic fields (≲250mT), low temperatures (≲250mK), and frequencies (≲10 GHz), constraining their applications.
Using disordered superconductors with a larger superconducting gap, like NbN, could expand these limits by an order of magnitude. This project aims to demonstrate that NbN’s non-linearity can replace Al JJ’s, enabling lossless microwave components for research at higher magnetic fields (~6 T), temperatures (~4 K), and frequencies (~100 GHz).
During this master’s project, you’ll work with a team of 30, including 15 Ph.D. researchers, contributing to sample development, design, theory, and nano-fabrication in our cleanroom. You'll also learn cryogenic cooling and perform advanced DC and RF measurements. This project may evolve into a Ph.D. thesis.
References:
[1] Appl. Phys. Lett. 92, 203501, 2008
[2] Appl. Phys. Lett. 118, 142601, 2021
[3] Appl. Phys. Lett. 118, 054001, 2021
Contact
Xavier Jehl
03/10/2024
/
Thesis :
Funding :
37
Hybrid superconductor-semiconductor for parity protected qubit
Domaines
Condensed matter
Type of internship
Expérimental Description
Hybrid Superconductor-Semiconductor (S-Sm) nanostructures are nano-circuits combining superconducting and semiconducting materials. These devices leverage superconductivity, a macroscopic quantum effect providing quantum coherence for qubits, and semiconducting properties that allow carrier control via an electrostatic gate, like in a field-effect transistor (FET). Our research focuses on aluminum-germanium nanostructures fabricated in our cleanroom. Our samples feature a loop with two hybrid nanostructures, and we observed that only even-numbered Cooper pair transport occurs, a key property for parity-protected qubits.
The project aims to integrate our hybrid nanostructure into a circuit Quantum ElectroDynamics (cQED) architecture, commonly used in superconducting quantum information. Partnering with CEA-LETI, we utilize advanced flip-chip integration to couple different quantum chips. The final samples will be tested at cryogenic temperatures using advanced DC and microwave setups.
As part of the master’s project, you’ll work with a team of 30, including 15 Ph.D. researchers, contributing to sample development, design, theory, and nano-fabrication. You'll also learn cryogenic cooling and advanced DC and RF measurements. This project may evolve into a Ph.D. thesis.
[1] Phys. Rev. Research 6, 033281, 2024
[2] arXiv:2405.14695, 2024
[3] npj Quantum Information, 6, 2020
Contact
Xavier Jehl
03/10/2024
/
Thesis :
Funding :
38
Flying Qubit in Graphene
Domaines
Condensed matter
Quantum information theory and quantum technologies
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
The solid-state systems, presently considered for quantum computation, are built from localized two-level systems, prime examples are superconducting qubits or semiconducting quantum dots. Due to the fact that they are localized, they require a fixed amount of hardware per qubit.
Propagating or “flying” qubits have distinct advantages with respect to localised ones: the hardware footprint depends only on the gates and the qubits themselves (photons) can be created on demand making these systems easily scalable.
A qubit that would combine the advantages of localised two-level systems and flying qubits would provide a paradigm shift in quantum technology. In the long term, the availability of these objects would unlock the possibility to build a universal quantum computer that combines a small, fixed hardware footprint and an arbitrarily large number of qubits with long-range interactions. A promising approach in this direction is to use electrons rather than photons to realise such flying qubits. The advantage of electronic excitations is the Coulomb interaction, which allows the implementation of a two-qubit gate .
The aim of the present internship will be the development of the first quantum-nanoelectronic platform for the creation, manipulation and detection of flying electrons on time scales down to the picosecond and to exploit them for quantum technologies. In particular, the student will characterize a Graphene optical-to-electrical converter.
Contact
Preden Roulleau
03/10/2024
/
Thesis :
Funding :
39
Magic Angle Twisted Trilayer Graphene
Domaines
Condensed matter
Quantum information theory and quantum technologies
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
Condensed matter physicists used to associate new exotic properties to new materials development. In 2018 a paradigm shift happened with the observation of superconductivity in two layers of graphene with a relative crystallographic rotation of ~ 1.1 degrees, the so-called magic angle twisted graphene (MATG). This unprecedented new knob to change properties of 2D materials is already showing a plethora of unexplored properties and leading to a universe of new technologicaal applications in the new and fast growing field of twistronics (Twistronics: control of the electronic properties of 2D materials in a van der Waals heterostructure by changing their relative crystallographic alignment)
The unexpected behavior in MATG is due to the existence of flat bands in its electronic band structure. These flat bands are the product of the interplay of interlayer tunneling and angle-induced momentum mismatch, which guarantees a large density of states and therefore an amplification of the effects of interactions. This causes correlated states which manifest experimentally by the emergence of new ground states such as superconductivity (SC), Mott insulators and quantum anomalous Hall effect (QAHE). Recently, we managed to observe superconductivity in a magic angle twisted trilayer graphene. In this internship, the student will perform electronic transport measurements (current and shot noise) in this device to reveal fundamental properties of cooper pairs.
Contact
Preden Roulleau
03/10/2024
/
Thesis :
Funding :
40
Energy harvesting using topological quantum materials in the THz regime
Domaines
Condensed matter
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Today, the need of low-consumption and eco-friendly technologies has become crucial. This internship offers to study and optimize the recycling of a THz radiation into a DC current. This investigation relies on a recently discovered Hall effect – the nonlinear Hall effect – that appears in certain quantum materials. It refers to the emergence of a transverse DC current under an AC excitation, without the need of external power supply. The nonlinear Hall effect triggered by a THz radiation relies on fundamental quantum phenomena such as topology and chirality that we propose to investigate.
Contact
Louis-Anne De Vaulchier
02/10/2024
/
Thesis :
Funding :
41
The birth of ferroelectric topological insulators
Domaines
Condensed matter
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
In the present internship, we will focus on the intriguing interplay between topology and ferroelectricity. From a fundamental point of view, combining ferroelectricity with topology is predicted to host Weyl fermions. These relativistic fermions can be mimicked by massless electrons that possess a definite chirality, meaning that their spins are parallel or antiparallel to their momenta. They are at the heart of a large number of outstanding properties that are just starting to be addressed, such as dissipationless chiral currents driven by the chiral magnetic effect, efficient spin-charge conversion due to the large anomalous Hall effect or efficient higher harmonic generation due to ultrafast dynamics. Weyl fermions are also promising particles to form qubits based on chirality. Therefore, it is of great interest to establish a platform capable of control and manipulation of Weyl fermions.
Contact
Louis-Anne De Vaulchier
02/10/2024
/
Thesis :
Funding :
42
Josephson physics of high-transparency quantum conduction channels in 2D Germanium
Domaines
Condensed matter
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Two-dimensional (2D) Ge-based heterostructures have recently been put to the forefront of quantum technologies for their high mobility and as a platform for spin qubit architectures. Additionally, 2D-Ge forms high transparency contacts to superconductors (S), offering a promising platform for hybrid superconductor / semiconductor physics. This could have promising applications for combining superconducting with spin-based qubits.
In short S-Ge-S junction, the Josephson effect (dissipationless current flow) can be realized. Electronic transport is governed by only few conduction channels with conductance G=tau G_Q, where G_Q=2e^2/h is the quantum of conductance and 0 <tau < 1 is the channel transmission. In the superconducting state, each channel leads to a so-called Andreev bound state (ABS), which carries the supercurrent. In ballistic junctions with tau approaching 1, the ABSs can have intriguing properties which are the object of this project.
In this Master project you will fabricate and investigate 2D-Ge Josephson junctions based on new superconducting materials which form contacts to Ge with tau approaching 1. The next step consists in moving to 3- and 4-terminal Josephson junctions in 2D-Ge. Here, the ABS are more complex and can be varied by the quantum phases in each superconducting lead, which can lead to topologically distinct ground states. You will study the dc transport properties of multi-terminal junctions and confront the results to theory.
Contact
Xavier Jehl
02/10/2024
/
Thesis :
Funding :
43
Probing the band structure of graphene-based topological 2D materials with quasiparticle interference.
Domaines
Condensed matter
Low dimension physics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Conducting electrons screen defects by forming an oscillation of local density of states around them. This effect known as quasiparticle interferences (QPI) can be observed in the real space with the scanning tunneling microscope (STM) and is precious to determine the Fermi surface of materials which can be reconstructed from their Fourier transform.
We have recently shown that graphene’s Berry phase can also be measured from the QPI signal [1,2]. This opens new possibilities to use quasiparticle interference to determine the topological properties of materials, which are difficult to measure by other means. The present research project aims at developing the technique and apply it to new graphene based materials like twisted bilayer graphene, superconducting graphene (induced by proximity), Rhombohedral graphene etc. The success will rely on the mastering of creating defects at the surface of graphene either by ion bombardment or hydrogen functionalization. We are looking for a motivated Phd candidate with a strong background in condensed matter physics interested in low temperature scanning tunneling microscopy. The candidate will be involved in the project from sample preparation to the STM measurements and participate to a long term collaboration with Madrid University. The experimental work will be backed by theoretical input from the University of Bordeaux and Cergy Pontoise.
[1] C. Dutreix et al. Nature 574, 219 (2019)
[2] Y. Guan et al. ArXiv:2307.10024 (2023)
Contact
Vincent RENARD
02/10/2024
/
Thesis :
Funding :
44
Graphene nanostructuring for energy conversion at nanoscale
Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Research on new thermoelectric (TE) devices and materials for thermal management at nanoscale is highly demanded in nanoelectronics. Energy conversion of TE nanogenerators aims to recover waste heat in nanoelectronics, improving device performances. Active TE materials must have low thermal conductivity and high electrical conductivity, which is an antonymic behavior in common bulk materials but it can be achieved in nanostructured systems. The discovery of 2D materials has open new routes of investigation in this domain.
The internship focuses on the experimental investigation of the electric, thermoelectric and thermal properties of devices based on nanostructured graphene, allowing to engineer new TE low dimensional materials and also to investigate fundamental properties relative to phonon and electron transport. Nanostructuring will be engineered by a network of holes in the few hundreds of nm range, aiming to control separately the phonon and electron mean free paths. The student will be involved in sample fabrication in clean room and electrical measurements. The team has recently demonstrated the ability of achieving a complete thermoelectrical characterization of 2D materials-based devices and has already achieved promising preliminary results. The team’s expertise in charge ransport in 2D materials and in clean room nano fabrication will be exploited in the project.
Contact
Maria Luisa Della Rocca
01/10/2024
/
Thesis :
Funding :
45
Investigation of sub-Kelvin behaviour of advanced SiGe heterojunction bipolar transistors for quantum bits experiments
Domaines
Condensed matter
Quantum Machines
Quantum information theory and quantum technologies
Type of internship
Expérimental Description
Silicon Germanium (SiGe) Heterojunction Bipolar Transistors (HBTs) achieve the best performances of Si-based technologies and are now enabling low-noise and high-speed applications in our daily life. They rely on a graded content of Ge introduced in the epitaxial growth of the HBT base. By doing so, a true bandgap engineering is achieved and allows to optimize the transistor characteristics far beyond the limits of pure materials like Si.
Our laboratory in PHELIQS at CEA-Grenoble studies spin quantum bits made with Si MOSFETs from CEA-Leti or homemade Ge heterostructures. Even though it is not always widely known, all such qubits experiments include a HEMT or a SiGe HBT in the first front-end cryogenic low noise amplifier (LNA) of the readout chain. Recently we have designed and fabricated our own LNAs, using a commercially available BiCMOS technology, which exhibits low performances than more recent technologies.
In this internship we will investigate advanced BiCMOS devices from the B55 technology of STMicroelectronics, for applications in quantum bits experiments. We will measure their characteristics down to 3.2K or 0.45K in homemade pulse-tube based cryostats.
This work will be carried in close collaboration with STMicroelectronics which not only provides advanced BiCMOS chips but also shares its deep knowledge of SiGe HBT devices, including previous cryogenic characterizations at high frequency and above 4K.
Contact
Xavier Jehl
01/10/2024
/
Thesis :
Funding :
46
Unveil thermoelectric properties of 2D α-In2Se3
Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Recently bidimensional (2D) van der Waals (vdW) III−VI semiconductors have drawn intense attention due to their unique electronic properties. Among these materials, In2Se3 in its most studied α phase, shows a great potential for a wide variety of applications in electronics, photonics and even thermoelectricity, due to its good mobility, excellent photoresponsivity, exotic ferroelectricity, and unique band structure.
First-principles calculations based on the density functional theory and Boltzmann transport theory show that monolayered α-In2Se3 is also a great candidate for high-performance thermoelectric materials with the power factor PF and the figure of merit ZT as high as 0.02W/mK2 and 2.18 at room temperature4.
The main goal of the internship is to go a step forward in the investigation of the correlation between thermoelectric and ferroelectric properties of α-In2Se3 thin layer. The student will fabricate α-In2Se3 based transistors for electric and thermoelectric investigation. The activity will cover sample fabrication in clean room (dry transfer of the 2D material, e-beam lithography, etching, metal deposition, AFM/Raman analysis …) and electrical measurements in a multi-probe station as a function of the temperature. The team has a strong expertise in the investigation of charge and spin transport in 2D materials and in clean room micro and nano fabrication techniques. This expertise will be exploited in the project.
Contact
Maria Luisa Della Rocca
01/10/2024
/
Thesis :
Funding :
47
Crystallization of nanomaterials: theory and simulation
Domaines
Condensed matter
Statistical physics
Soft matter
Physics of liquids
Nonequilibrium statistical physics
Non-equilibrium Statistical Physics
Kinetic theory ; Diffusion ; Long-range interacting systems
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Théorique, numérique Description
Research overview
The formation of a crystal is triggered by the emergence of a nucleation core. Classical nucleation theory (CNT) is widely employed to discuss its nature and its origin. In CNT, the thermodynamically stable phase is always the one that grows first and its size is then driven by the free energy competition between how much it costs to build a liquid-crystal interface and the gain from growing the crystal. Yet, following Ostwald’s rule, another structure may emerge beforehand if it is closer in free energy to the mother phase. Then, structural and also chemical reorganizations happen during the growth. This multi-stage nucleation mechanism already appears in bulk systems but can be amplified in nanocrystal nucleation where surface effects and chemical reactivity are enhanced. For nanoscience to be inspired by the practical applications instead of still being driven by the synthesis possibilities, it is crucial to reach a better understanding of the unique crystallization mechanisms leading to nanocrystals.
Simulation project
Atomistic simulations will be performed to study crystallization of binary particles. Examples will be taken from well-studied materials including CuZr, NiAl, NaCl, Water... We will investigate the correlation between the thermodynamic conditions and the final nanoparticles. The goal is to ultimately better understand how nucleation theory is affected by downsizing to the nanometric scale.
Contact
Julien LAM
01/10/2024
/
Thesis :
Funding :
48
Machine-learning approaches to model interatomic interactions
Domaines
Condensed matter
Statistical physics
Soft matter
Physics of liquids
Nonequilibrium statistical physics
Non-equilibrium Statistical Physics
Kinetic theory ; Diffusion ; Long-range interacting systems
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Théorique, numérique Description
Research overview
Materials can be studied using computer simulation which enables one to probe the motion of each constituent atoms and to build correlations between the macroscopic properties and the microscopic behaviors. On the one hand, traditional quantum mechanics methods provides particularly accurate results up to the electronic structure of the material. Yet, the drawback of this method concerns its computational cost which prevents from studying large system sizes and long time scales. On the other hand, effective potentials have been developed to mimic atomic interactions thereby reducing those issues. However, these potentials are often built to reproduce bulk properties of the materials and can hardly be employed to study some specific systems including interfaces and nanomaterials. In this context, a new class of interatomic potentials based on machine-learning algorithms is being developed to retain the accuracy of traditional quantum mechanics methods while being able to run simulations with larger system sizes and longer time scales.
Simulation project
Using computer simulations, the student will construct a database that should be representative of the different interactions occurring in a specific material. Machine-learning potentials based on the least-angle regression algorithm as well as neural network potentials will be trained and their accuracy will be studied as a function of the size and the complexity of the database.
Contact
Julien LAM
01/10/2024
/
Thesis :
Funding :
49
COUPLED ELECTRON AND PHONON DYNAMICS IN GRAPHITE FOR POTENTIAL THERMOELECTRIC APPLICATIONS: EXTERNAL PHONON BATH EFFECTS
Domaines
Condensed matter
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Théorique, numérique Description
This theoretical project aims at opening new ways to improve the thermoelectric efficiency of materials, by exploring the phonon drag effect, which arises from the momentum transfer (or drag) between the out-of-equilibrium phonon and electron populations, and which is responsible for the strong increase in Seebeck and Peltier coefficients of thermoelectric materials at low temperature. The concept we aim to explore is the use of substrate as an external phonon bath to provide additional out-of-equilibrium phonons, in order to enhance phonon drag effect and shift it to higher temperatures in the conducting channel. We aim to describe the coupled dynamics of electrons and phonons via an approach based on Density Functional Theory and on the solution of coupled Boltzmann transport equations for electrons and phonons which was recently developed in our group, and to extend it by including the effect of interface and substrate.
The study will first focus on phonon drag in graphite, in link with our new collaboration with experimentalists in the framework of ANR project DragHunt.
A successful internship can be followed by a PhD on related subject, financed by ANR DragHunt.
Contact
Jelena Sjakste
01/10/2024
/
Thesis :
Funding :
50
Coherent processes in matter waves with engineered symmetries and interactions
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Low dimension physics
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Quantum gases
Type of internship
Expérimental et théorique Description
This Master 2 internship proposal focuses on coherent processes in matter waves with engineered symmetries and interactions, exploring the quantum effects that challenge classical diffusive behaviors. Classical particles in chaotic systems experience diffusion and ergodicity, but in the quantum realm, interference can lead to phenomena like localization, breaking this diffusion. Coherent forward and backward scattering, influenced by system symmetries, is a key aspect of this. Additionally, understanding how localization and ergodicity evolve in many-body systems with interactions is an area of active research.
The Cold Atoms team at LCAR in Toulouse studies quantum chaos experimentally, using rubidium atoms in optical lattice traps. They previously observed chaos-assisted dynamical tunneling and recently measured coherent scattering peaks with matter waves. This internship will develop new engineered dynamics using cold atoms to further investigate the role of symmetries and interactions in chaotic dynamics. The candidate will use numerical models and experimental setups, including engineered symmetries in synthetic lattices and the study of interactions in tunneling dynamics.
Besides the actual experimental setup currently used, a new (quite advanced) experimental setup is being developed to explore many-body quantum chaos with enhanced stability, optical access, and control over optical potentials I the course of the PhD project following the internship.
Contact
David Guéry-Odelin
30/09/2024
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Thesis :
Funding :
51
Three-body interactions in coupled two-component condensates
Domaines
Quantum optics/Atomic physics/Laser
Low dimension physics
Quantum gases
Type of internship
Expérimental Description
In a context where the physics of quantum gases is usually limited to two-body interactions, we plan to study consequences of emerging three-body interactions on the dynamics of Bose-Einstein condensates.
Contact
Thomas Bourdel
27/09/2024
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Thesis :
Funding :
52
Random-Access Quantum Memory with Rare-Earth Ion Spins
Domaines
Condensed matter
Quantum information theory and quantum technologies
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Type of internship
Expérimental Description
A system able to store several quantum states, with the ability to absorb and retrieve a given state on demand, is dubbed a Random-Access Quantum Memory. Such memories can be used in quantum repeaters to improve long-distance quantum communication, but also to provide an alternate parallelism strategy in quantum processors. This PhD project will be about demonstrating high-fidelity storage of microwave quantum states using an ensemble of rare-earth ion spins and interfacing it with a superconducting circuit.
Our current challenge is to achieve strong, adjustable coupling between the spin and superconducting circuit—a pivotal aspect of our research. We will explore a new type of spin system that promises exceptional coherence at zero magnetic field and enhanced coupling strength. The internship will center on fabricating and measuring a test sample to evaluate the performance of this innovative system during the internship. The PhD thesis will center on developing and testing a complete hybrid quantum system able to store and retrieve quantum bits generated by a superconducting circuit into the spin ensemble.
The internship will take place in the physics lab at ENS Lyon, in the quantum circuit group (http://physinfo.fr)
Contact
Audrey Bienfait
Laboratory : laboratoire de physique, ENS de Lyon - umr 5672
Team : ENS de Lyon, Physique
Team Website
Team : ENS de Lyon, Physique
Team Website
25/09/2024
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Thesis :
Funding :
53
Quantum Spintronic Qubit: first experiments
Domaines
Condensed matter
Quantum information theory and quantum technologies
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Many hardware platforms exist to implement qubit operations for quantum technologies, but these
platforms, although conceptually elegant, do not offer a straightforward path toward consumer
applications in terms of energy/resource usage (#QEI): low/very low temperatures, external magnetic
fields, lasers/microwave sources, a room-full of optical/electrical/vacuum/cryogenic equipment, difficulty
to entangle qubits... To address this challenge, we propose to utilize spintronics, and its industrial penetration as a green nanotechnology, to develop a new platform around the quantum spintronic qubit. Since this paradigm is onyl now emerging, this experimental topic will investigate the first foundational elements of this new paradigm, with inroads into quantum communication and energy harvesting.
Contact
Martin Bowen
25/09/2024
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Thesis :
Funding :
54
Inertial quantum sensing based on optomechanical coupling in rare-earth-doped crystals
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Quantum information theory and quantum technologies
Metrology
Type of internship
Expérimental Description
Developing a broadband, high-sensitivity accelerometer operating at cryogenic temperatures is a key challenge in many cutting-edge experimental physics domains, from quantum technologies (including near-field microscopy, quantum memories, etc.) to gravitational wave detection. To realize such a sensor, a promising approach is hybrid optomechanics, which couples quantum and mechanical degrees of freedom in a single physical system.
Rare-earth ion-doped crystals, known for their extremely narrow optical transitions at low temperature (~3K), exhibit natural optomechanical coupling through the piezospectroscopic sensitivity of the ion’s energy levels to mechanical stress. These crystals have recently emerged as strong candidates for quantum-enabled, low-temperature accelerometry, and we recently demonstrated continuous optical measurement of cryostat vibrations with such crystals, with an already promising sensitivity and bandwidth [1,2].
However, significant work is needed to obtain an ultra-sensitive, unidirectional and calibrated accelerometer.
During this internship, we will investigate the fundamental and technical limitations of the method (in terms of sensitivity and bandwidth in particular), using emulated or real vibrations. Additionally, we aim to extend the operational range to higher temperatures (up to 10K), which will be key for expanding the potential applications of our sensor
Contact
Anne Louchet-Chauvet
Laboratory : Institut Langevin - Ondes et Images - UMR7587
Team : Materials, Resonances, Interfaces
Team Website
Team : Materials, Resonances, Interfaces
Team Website
25/09/2024
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Thesis :
Funding :
55
Quantum Nano-Photonics with 2D Materials
Domaines
Condensed matter
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
The 2D+ Research Group at CRHEA – located in the French Riviera (Côte d’Azur) near Nice, France – is seeking a highly motivated and talented Master’s student to join our cutting-edge research in quantum nano-photonics. This internship offers a unique opportunity to work on foundational quantum technologies, with a clear pathway to extend the project into a funded PhD position as part of the ANR project “NEAR-2D.”
-->Research Focus
The master intern’s primary objective will be coupling two quantum emitters using 2D materials like MoSe2. This initial project will serve as the foundation for further exploration of quantum emitter arrays during the PhD. By leveraging near-field interactions and quantum collective effects, this work aims to pave the way for new methods of controlling light-matter interactions at the nanoscale.
As part of the PhD, the candidate will expand this research by creating sub-λ arrays of quantum emitters and exploring quantum collective effects like sub-radiance and super-radiance, which have vast potential in nano-photonics and quantum technologies.
Contact
Antoine Reserbat-plantey
24/09/2024
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Thesis :
Funding :
56
Operando investigation of optoelectronic device using advanced photoemission
Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
The aim of this project is to go beyond standard material characterization by studying the electronic properties of devices during operation. Leveraging the unique platform developed by our group at INSP, which combines Raman, infrared, and visible spectroscopy with multi-source X-ray photoemission (XPS) across a broad energy range (from meV to 5 keV), and offering precise control of temperature and bias, we will explore the energy landscape of nanocrystal-based LEDs. These devices have a vertical geometry typically incompatible with the low escape depth of standard photoelectron spectroscopy. However, the hard X-ray capability of our setup, combined with the redesigned device architecture incorporating 2D materials, will allow us to probe the active layer under operando conditions.
Contact
Debora Pierucci
24/09/2024
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Thesis :
Funding :
57
Biréfringence Magnétique du Vide / Vacuum Magnetic Birefringence
Domaines
Quantum optics/Atomic physics/Laser
Non-linear optics
Metrology
Type of internship
Expérimental Description
The BMV project (Vacuum Magnetic Birefringence) is an ambitious experiment whose goal is to check in-laboratory predictions for vacuum energy in quantum electrodynamics. This theory predicts that vacuum, in the presence of a magnetic field, behaves as a birefringent medium. The experiment blends intense pulsed magnetic fields with a sensitive optical apparatus, centered around a high-finesse cavity.
Contact
Remy Battesti
24/09/2024
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Thesis :
Funding :
58
Light transport in optical fibers and reciprocity breaking
Domaines
Condensed matter
Statistical physics
Low dimension physics
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Kinetic theory ; Diffusion ; Long-range interacting systems
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Reciprocity in optics is often seen as a property responsible for the fact that “if I can see you, you can see me”. In multiple scattering coherent wave transport, i.e., if interferences within the scattering region are taken into account, reciprocity is known to reduce the transmission of the medium with respect to a situation where interferences are absent. This phenomenon is known as localization. It is possible to break reciprocity for instance in the
presence of materials showing some magneto-optical Faraday effect. Breaking of reciprocity gives new insight to the fundamental understanding of coherent wave transport, and therefore, we propose, in this master project, to develop an original setup to measure the influence of reciprocity in coherent wave transport in multimode optical fibers.
Contact
Geoffroy Aubry
24/09/2024
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Thesis :
Funding :
59
Active photonic devices using colloidal quantum dots
Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
The project aims to shape the light matter interaction in a nanocrystal use for infrared sensing. We aim to introduce new functionalities such as a reconfigurable photoresponse with external knob such as bias and in the long term transfer the concept to the camera level
Contact
Emmanuel Lhuillier
23/09/2024
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Thesis :
Funding :
60
Quantum information in quantum optics and superselection rules
Domaines
Quantum information theory and quantum technologies
Quantum optics
Metrology
Type of internship
Théorique, numérique Description
Quantum information can be encoded in the quantum electromagnetic field in various ways. For example, non-classical superpositions of photon number states, such as Schrödinger cat states, provide one form of encoding. Alternatively, the degrees of freedom of single photons, such as polarization, can be used to encode qubits. An intriguing question arises: is there a way to relate these two types of quantum information encoding—one based on particle statistical properties and the other on mode/particle entanglement? Can one be mapped onto the other while adhering to physical principles, such as energy conservation, or informational principles, such as providing the same advantage over classical encodings? Our goal is to design common quantifiers for these quantum optical encodings.
During this internship, we will address this issue in the particular field of quantum metrology, which aims to achieve quantum-enhanced precision in parameter estimation. Using single photons in different frequency modes results in the same type of precision enhancement as that achieved with photon number state superpositions. Our objective is to develop a unified formalism that describes all quantum optical encodings capable of achieving quantum-enhanced precision.
Contact
Perola Milman
12/09/2024
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Thesis :
Funding :
61
Thermodynamics of open quantum systems in the coherent-dissipative regime
Domaines
Low dimension physics
Quantum Machines
Non-relativistic quantum field theory, quantum optics, complex quantum systems
Nonequilibrium statistical physics
Quantum information theory and quantum technologies
Quantum optics
Non-equilibrium Statistical Physics
Type of internship
Théorique, numérique Description
The booming field of quantum thermodynamics analysis quantum signatures in work and heat flows, the performances of quantum heat engines and derive fundamental constraints on quantum dynamics. The goals of this theory project is to develop a new methodology able to explore the "coherent dissipative" regime of quantum open systems, where large deviations from classical thermodynamic behavior are expected, but which is not well captured by existing methodologies. Applications will cover quantum heat engines and different situations of experimental relevance, in connexion with experimentalists.
This Master project can be followed by a PhD funded by the ERC Starting grant project "QARNOT".
Contact
Cyril Elouard
12/09/2024
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Thesis :
Funding :
62
Quantum imaging for sub-shot noise monitoring of optically-levitated nano-particles
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Quantum information theory and quantum technologies
Quantum optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
In optical levitation, a nanoparticle is trapped in vacuum using tightly focused light. The light produces a force akin to a mechanical spring and the system reduces to a simple mass-spring resonator with kHz oscillations. Despite its simplicity, a levitated object provides remarkable interactions between light and its motion that can be harnessed to display quantum properties. In that regard, the particle must be cooled down to its quantum ground state, which requires to monitor its motion with optimal precision. Typically, this is achieved using the classical light produced by a laser. Yet, lasers are intrinsically shot-noise limited, thus making cooling challenging. Recently, some works have emphasized that quantum light can outperform classical light. For instance, entangled photons can serve to suppress shot noise. A photon of the pair images a target (signal), while a second acts as a reference (idler). As shot noise identically affects both photons, it is suppressed from the signal by subtracting the idler.
During this internship, the candidate will experimentally harness entangled photons to perform sub-shot noise monitoring of levitated objects. He or she will develop an entangled-photon source, later on deployed on a levitation setup. To characterize the source, the student will visit the team of Pr. Molina in San Sebastian (Spain). Following the internship, he or she will be offered a PhD in cotutelle between Prs. Bachelard and Molina’s teams.
Contact
Nicolas Bachelard
Laboratory : Laboratoire Ondes et Matière d'Aquitaine - UMR 5798
Team : Nanophotonics Group
Team Website
Team : Nanophotonics Group
Team Website
11/09/2024
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Thesis :
Funding :
63
Casimir-Polder interaction control of cold atoms and nano devices for fundamental physics
Domaines
Quantum optics/Atomic physics/Laser
Condensed matter
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Quantum gases
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental et théorique Description
An atom in front of a surface is one of the simplest and fundamental problem in physics. Yet, it allows testing quantum electrodynamics, while providing platforms for quantum technologies. In particular, the presence of electromagnetic quantum fluctuations leads to a force between an atom and a surface. This force is called the Casimir-Polder (C-P) force. Despite its simplicity, C-P interaction, at its fundamental level, remains largely unexplored. In this context, our team has built a slow atomic beam interacting with a nanograting. This jet interacts with a carefully self-engineered nanograting, leading to a diffraction pattern dominated by the C-P force. The current interest of the experiment is to achieve an in-depth understanding of the C-P interaction. To achieve this goal, the successful applicant will take an active role in various aspects of the experiment including data acquisition, data analysis, the development of tools for characterizing the atomic source, and the installation of an optical dipole trap. Additionally, the internship has as well a theoretical component with the description of the interference figure and quantum electrodynamic calculations. The short-term goal of the project is to tailor the C-P interaction using material geometries. In the medium term, this work will open the door to study eventual modifications of the Newtonian gravitational interaction at short range, where C-P interaction shields such forces.
Contact
Quentin Bouton
11/09/2024
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Thesis :
Funding :
64
Terahertz Cavity Electrodynamics of Superconducting Collective Modes
Domaines
Condensed matter
Low dimension physics
Nouveaux états électroniques de la matière corrélée
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Non-linear optics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter
Type of internship
Expérimental Description
Strong light-matter interactions between quantum materials and the vacuum field of cavities at TeraHertz (THz) frequencies is emerging as a new frontier for the control of material properties. Among quantum materials, superconductors (SC) hold a special place and a timely question has arisen regarding the possibility to tune their spectacular properties by dressing their collective modes with THz cavity photons. In this internship, we propose to study the collective modes of NbSe2, an exotic SC exhibiting simultaneously SC and a charge density-wave (CDW) state. Of particular interest will be to investigate the dynamics of its Higgs-mode, an analogue of the Higgs-boson in SCs, and its interaction with the CDW mode. This will be achieved with a combination of equilibrium THz time-domain spectroscopy and pump-probe THz spectroscopy. The first steps towards integration of this SC inside THz cavities and the dressing of its collective modes will carried out.
Contact
Yannis LAPLACE
Laboratory : Laboratoire des solides irradiés - UMR 7642
Team : New electronic states - TeraX-lab
Team Website
Team : New electronic states - TeraX-lab
Team Website
02/09/2024
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Thesis :
Funding :