A5044039252- Strong Light-Matter Interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Quantum Electrodynamics and Casimir Effect
- Quantum and electron transport phenomena
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Orbital Angular Momentum in Optics
- Thermal Radiation and Cooling Technologies
- Quantum Mechanics and Applications
- Spectroscopy and Laser Applications
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Nonlinear Photonic Systems
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Quantum Chemical Studies
- Quantum, superfluid, helium dynamics
- Atomic and Molecular Physics
- Random lasers and scattering media
- Experimental and Theoretical Physics Studies
Centre National de la Recherche Scientifique
2013-2023
École Normale Supérieure - PSL
2001-2023
Sorbonne Université
2013-2023
Université Paris Sciences et Lettres
2015-2023
Laboratoire Kastler Brossel
2014-2023
Collège de France
2015-2023
Max Planck Institute for the Science of Light
2014-2020
Université des Lettres et des Sciences Humaines de Bamako
2018
Université Paris Cité
1981-2016
Max Planck Society
2015
A condensed-matter system is used to study superfluid dynamics.
In this work we review and further develop the controversial concept of "classical entanglement" in optical beams. We present a unified theory for different kinds light beams exhibiting classical entanglement indicate several possible extensions concept. Our results shed new upon physics at debated border between quantum representations world.
We describe how a two-mode, above-threshold, optical parametric oscillator can generate nonclassical states of light with large average number photons: the fluctuation spectrum various fields is calculated, and several quantities are shown to have squeezed fluctuations. In particular, perfect quantum noise suppression predicted on difference between intensities two generated beams. an experiment designed demonstrate such effect show it be used high-intensity amplitude-squeezed states.
Quantum approaches relying on entangled photons have been recently proposed to increase the efficiency of optical measurements. We demonstrate here that, surprisingly, use classical light with degrees freedom can also bring outstanding advantages over conventional measurements in polarization metrology. Specifically, we show that radially polarized beams allow perform real-time single-shot Mueller matrix polarimetry. Our results indicate quantum procedures requiring entanglement without...
Quantum fluids of light are a photonic counterpart to atomic Bose gases and attracting increasing interest for probing many-body physics quantum phenomena such as superfluidity. Two different configurations commonly used: the confined geometry where nonlinear material is fixed inside an optical cavity propagating propagation direction plays role effective time system. The observation dispersion relation elementary excitations in photon fluid has proved be difficult task both with few...
In inflationary cosmology, the rapid expansion of early universe resulted in spontaneous production cosmological particles from vacuum fluctuations, observable today cosmic microwave background anisotropies. The analogue particle creation a quantum fluid could provide insight, but an observation has not yet been achieved. Here we report laboratory, using quenched 3-dimensional light. We observe acoustic peaks density power spectrum, close quantitative agreement with quantum-field theoretical...
On présente une analyse semi-classique des caractéristiques de bruit d'un oscillateur paramétrique optique non dégénéré opérant au-dessus du seuil, permettant d'obtenir I'expression fluctuations quantiques intensités et phases champs émis.On met l'accent plus particulièrement sur l' étude existant la différence entre les deux produits.On étudie l'effet cette quantité pertes, déséquilibre, désaccords l'excès pompe.On trouve réduction significative quantique dans un large domaine espace paramètres.
We present an experimental demonstration of both quadrature and polarization entanglement generated via the interaction between a coherent linearly polarized field cold atoms in high finesse optical cavity. The nonlinear atom-field produces two squeezed modes with orthogonal polarizations which are used to generate pair nonseparable beams, is demonstrated by checking inseparability criterion for continuous variables recently derived Duan et al. [Phys. Rev. Lett. 84, 2722 (2000)] calculating...
We solve the problem of a laser with variable pumping statistics for any relative magnitude atomic- and cavity-decay constants, obtain different regime sub-Poissonian light generation. show that, even Poissonian pumping, noise in amplitude quadrature outside cavity can be reduced up to 50% below shot-noise level when polarization but not populations adiabatically eliminated. Maximum reduction this case is obtained lower decays much faster than upper one occurs at frequency given by...
We investigate the cross interactions in a two-component polariton quantum fluid coherently driven by two independent pumping lasers tuned at different energies and momenta. show that both hysteresis cycles on-off threshold of one signal can be entirely controlled second fluid. Furthermore, we study ultrafast switching dynamics state, demonstrating ability to control population with an external laser pulse, less than few picoseconds.
Two phenomena can affect the transmission of a probe field through an absorbing medium in presence additional field: electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS). Being able to discriminate between two is important for various practical applications. Here we present experimental investigation into method that allows such disambiguation as proposed by Anisimov, Dowling, Sanders Phys. Rev. Lett. 107, 163604 (2011). We apply test based on Akaike's information...
We report the formation of a ring-shaped array vortices after injection angular momentum in polariton superfluid. The is injected by $\ell= 8$ Laguerre-Gauss beam, whereas global rotation fluid hindered narrow Gaussian beam placed at its center. In linear regime spiral interference pattern containing phase defects visible. nonlinear (superfluid) regime, disappears and nucleate as consequence quantization. radial position evolves freely region between two pumps function density. Hydrodynamic...
We demonstrate, theoretically and experimentally, a polarization-controlled optical gate based on degenerate polariton-polariton scattering process occurring in semiconductor microcavities. Because of the interference between coherent polaritons, this is observed case polaritons generated from two collinearly polarized pump beams. On contrary, if beams are cross polarized, suppressed.
Abstract Quantum simulations are one of the pillars quantum technologies. These provide insight in fields as varied high energy physics, many‐body or cosmology to name only a few. Several platforms, ranging from ultracold‐atoms superconducting circuits through trapped ions have been proposed simulators. This article reviews recent developments another well established platform for simulations: polaritons semiconductor microcavities. quasiparticles obey nonlinear Schrödigner equation (NLSE),...
Vacuum quantum fluctuations near horizons are known to yield correlated emission by the Hawking effect. We use a driven-dissipative fluid of microcavity polaritons as an analog model field theory on black-hole spacetime and numerically calculate emission. show that, in addition effect at sonic horizon, may result sizable stationary excitation quasinormal mode theory. Observable signatures found spatial density well spectrum This suggests intrinsic fluctuation-driven mechanism leading modes...
We detail the oscillation properties of cw type-II optical parametric oscillators (signal and idler modes with orthogonal polarizations). When signal frequencies are very close, they shown to have characteristics that quite different from well-known type-I oscillators. determine in particular cavity-length values for which occurs how output fields vary when one changes this length, crystal angle, or temperature. Finally, we influence mirror phase shifts on a linear-cavity OPO.