A5067445717- Photonic and Optical Devices
- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Topological Materials and Phenomena
- Advanced Optical Sensing Technologies
- Quantum optics and atomic interactions
- Photorefractive and Nonlinear Optics
- Quantum many-body systems
- Cold Atom Physics and Bose-Einstein Condensates
- Mechanical and Optical Resonators
- Graphene research and applications
- Strong Light-Matter Interactions
- Random lasers and scattering media
- Quantum Mechanics and Applications
- Advanced Fluorescence Microscopy Techniques
- Plasmonic and Surface Plasmon Research
- Advanced Photonic Communication Systems
- Quantum Mechanics and Non-Hermitian Physics
- Optical Coatings and Gratings
- Laser-Matter Interactions and Applications
- Nanofabrication and Lithography Techniques
- Photonic Crystals and Applications
- Force Microscopy Techniques and Applications
- Quantum chaos and dynamical systems
- Advanced Electrical Measurement Techniques
Collège de France
2019-2024
Université Paris Sciences et Lettres
2019-2024
Centre National de la Recherche Scientifique
2007-2024
Université Paris-Saclay
2024
ARC Centre of Excellence for Engineered Quantum Systems
2015
UNSW Sydney
2015
Laboratoire Traitement et Communication de l’Information
2010-2013
Télécom Paris
2011
Laboratoire Traitement du Signal et de l'Image
2008-2009
We propose the "Andreev molecule", an artificial quantum system composed of two closely spaced Josephson junctions. The coupling between junctions in Andreev molecule occurs through overlap and hybridization junction's "atomic" orbitals, Bound States. A striking consequence is that supercurrent flowing one junction depends on superconducting phase difference across other junction. Using Bogolubiov-de-Gennes formalism, we derive energy spectrum non-local current-phase relation for arbitrary...
Abstract The ultra-quantum limit is achieved when a magnetic field confines an electron gas in its lowest spin-polarised Landau level. Here we show that this limit, doped ZrTe 5 shows metal-insulator transition followed by sign change of the Hall and Seebeck effects at low temperature. We attribute to freeze-out charge carriers on ionized impurities. reduction carrier density gives way anomalous response electrons. This behavior, odds with usual scenario, occurs Dirac metal because tiny...
The authors report on parametric luminescence in a single pillar semiconductor microcavity. Nonresonant photoluminescence measurements at 10K show that micropillars operate the exciton-photon strong coupling regime. Under resonant excitation, polariton scattering is observed: signal and idler beams are of comparable intensities, promising result framework quantum optics with correlated photon pairs.
An Andreev molecule is a system of closely spaced superconducting weak links accommodating overlapping Bound States. Recent theoretical proposals have considered one-dimensional molecules with single conduction channel. Here we apply the scattering formalism and extend analysis to multiple channels, situation encountered in epitaxial superconductor/semiconductor links. We obtain multi-channel bound state energy spectrum quantify contribution microscopic non-local transport processes leading...
Topology, like symmetry, is a fundamental concept in understanding general properties of physical systems. In condensed matter, nontrivial topology may manifest itself as singular features the energy spectrum or quantization electrical such conductance and magnetic flux. Using microwave spectroscopy, we determine that superconducting circuit with three Josephson tunnel junctions parallel can possess degeneracies indicative topology. We identify topological invariants, one which related to...
We have made a systematic investigation of charge transport in 1D chains Josephson junctions where the characteristic energy is much less than single-island Cooper-pair charging energy, $E_\mathrm{J}\ll E_{CP}$. Such are deep insulating state, superconducting phase coherence across chain absent, and voltage threshold for conduction observed at lowest temperatures. find that tunneling such completely suppressed. Instead, dominated by single electrons, which very sensitive to presence BCS...
A theoretical investigation of the performance single-mode coupled spontaneous parametric downconversion sources is proposed, which only requires very few assumptions practical interest: quasi-degenerate collinear generation and narrow bandwidth obtained through spectral filtering. Other assumptions, such as pump-beam spatial temporal envelopes, target profile size, nonlinear susceptibility distribution, are taken into account in final step computation, thus making theory general flexible....
Spontaneous parametric downconversion (SPDC) sources are an essential element of quantum communication and information processing systems. Their quality can be hampered by spectral, temporal, or spatial distinguishability the two photons a generated pair. Even when such defects have been corrected, ultimate SPDC source is limited intrinsic multiple pair generation. In this paper, effect transmission, filtering detection losses asymmetrical spectral bandwidths in photon paths on visibility...
Fast and complete characterization of pulsed spontaneous parametric down conversion (SPDC) sources is important for applications in quantum information processing communications. We propose a simple method to perform this task, which only requires measuring the counts on two output channels coincidences between them, as well modeling filter used reduce source bandwidth. The proposed experimentally tested evaluation SPDC (pair emission probability, total losses, fidelity) different...
Spectroscopy is a powerful tool to probe physical, chemical, and biological systems. Recent advances in microfabrication have introduced novel, intriguing mesoscopic quantum systems including superconductor-semiconductor hybrid devices topologically non-trivial electric circuits. A sensitive, general purpose spectrometer the energy levels of these lacking. We propose an on-chip absorption functioning well into millimeter wave band which based on voltage-biased superconducting interference...
When elliptically polarized maximally entangled states are considered, i.e., having a non random phase factor between the two bipartite polarization components, standard settings used for optimal violation of Bell inequalities no longer adapted. One way to retrieve maximal amount is compensate this while keeping inequality analysis settings. We propose in paper general theoretical approach that allows determining and adjusting order optimize inequalities. The formalism also applied several...
The ultra-quantum limit is achieved when a magnetic field confines an electron gas in its lowest spin-polarised Landau level. Here we show that this limit, doped ZrTe$_5$ shows metal-insulator transition followed by sign change of the Hall and Seebeck effects at low temperature. We attribute to freeze-out charge carriers on ionised impurities. reduction carrier density gives way anomalous response electrons. This behaviour, odds with usual scenario, occurs Dirac metal because tiny Fermi...
Noisy voltage sources can be a limiting factor for fundamental physics experiments as well device applications in quantum information, mesoscopic circuits, magnetometry, and other fields. The best commercial DC programmed to approximately six digits have intrinsic noise the microvolt range. On hand level metrological Josephson-junction based standards is sub-femtovolt. Although such considered "noiseless," they are generally not designed continuous tuning of output nor supplying current load...
Topology, like symmetry, is a fundamental concept in understanding general properties of physical systems. In condensed matter systems, non-trivial topology may manifest itself as singular features the energy spectrum or quantization observable quantities such electrical conductance and magnetic flux. Using microwave spectroscopy, we show that superconducting circuit with three Josephson tunnel junctions parallel can possess degeneracies indicative $\textrm{\emph{intrinsic}}$ topology. We...
Three dimensional microresonators (micropillars) operating in the strong coupling regime were studied by photoluminescence. Parametric oscillations of 0‐dimensional polaritons are evidenced on a single micropillar. Signal and idler beam comparable intensities, promising result aim emission correlated photon pairs.
A theoretical study of the performance single-mode coupled spontaneous parametric downconversion sources is proposed, which only requires very few assumptions practical interest : narrow-bandwidth and quasi-degenerate collinear generation. Other like pump beam spatial temporal envelopes, target profile size, non-linear susceptibility distribution, are taken into account in final step computation, thus making theory general flexible. Figures merit for include absolute collected brightness,...