A5057654973- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Advanced Frequency and Time Standards
- Spectroscopy and Laser Applications
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Strong Light-Matter Interactions
- Quantum, superfluid, helium dynamics
- Quantum and electron transport phenomena
- Quantum Mechanics and Applications
- Orbital Angular Momentum in Optics
- Random lasers and scattering media
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Physics of Superconductivity and Magnetism
- Advanced Thermodynamics and Statistical Mechanics
- Photonic Crystals and Applications
- Laser Design and Applications
- Near-Field Optical Microscopy
- Laser-Matter Interactions and Applications
- Scientific Measurement and Uncertainty Evaluation
- Plasmonic and Surface Plasmon Research
- Pesticide Residue Analysis and Safety
Centre National de la Recherche Scientifique
2012-2024
Laboratoire Photonique, Numérique et Nanosciences
2015-2024
Université de Bordeaux
2013-2024
Institut d’Optique Graduate School
2018-2021
Stanford University
2019
Stanford Medicine
2011-2017
Université Paris-Saclay
2016
CEA Paris-Saclay
2016
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016
Laboratoire Charles Fabry
2009-2013
Recent developments in quantum technology have resulted a new generation of sensors for measuring inertial quantities, such as acceleration and rotation. These can exhibit unprecedented sensitivity accuracy when operated space, where the free-fall interrogation time be extended at will environment noise is minimal. European laboratories played leading role this field by developing concepts tools to operate these relevant environment, parabolic flights, towers, or sounding rockets. With...
We demonstrate how to use feedback control the internal states of trapped coherent ensembles two-level atoms, and protect a superposition state against decoherence induced by collective noise. Our scheme is based on weak optical measurements with negligible backaction followed microwave manipulations. The efficiency system studied for simple binary noise model characterized in terms trade-off between information retrieval destructivity from probe. also correction more general types This...
We report on a novel experiment to generate non-classical atomic states via quantum non-demolition (QND) measurements cold samples prepared in high-finesse ring cavity. The heterodyne technique developed for QND detection exhibits an optical shot-noise limited behavior local oscillator power of few hundred μW, and bandwidth several GHz. This tool is used single pass follow non-destructively the internal state evolution sample when subjected Rabi oscillations or spin-echo interferometric sequence.
We report the relative frequency stabilization of a distributed feedback erbium-doped fiber laser on an optical cavity by serrodyne shifting. A correction bandwidth 2.3 MHz and dynamic range 220 are achieved, which leads to strong robustness against large disturbances up high frequencies. demonstrate that shifting reaches higher lower noise level compared standard acousto-optical modulator based scheme. Our results allow consider promising applications in absolute lasers cavities.
We report on the magnetic trapping of an ultracold ensemble Rb87 atoms close to a superconducting ring prepared in different states quantized flux. The niobium 10 μm radius is flux state n Φ0, where Φ0=h/2e quantum and varying between ±6. An atomic cloud 250 nK temperature positioned with harmonic potential at ∼18 distance below ring. inhomogeneous field supercurrent contributes cloud. induced deformation trap impacts shape cloud, number trapped atoms, as well center-of-mass oscillation...
One path to quantum information processing involves light-matter interaction, such as light in a photonic-crystal waveguide coupled cloud of ultracold alkali atoms. However, actually implement system, it is crucial increase the coupling strength beyond what presently achievable. The authors explain design requirements achieve large by decreasing group velocity an edge mode hybrid-clad waveguide, allowing photons ``slow light'' interact with trapped cold atoms robust, chip-integrated setting.
We demonstrate a Raman laser using cold $^{87}\mathrm{Rb}$ atoms as the gain medium in high-finesse optical cavity. observe robust continuous wave lasing atypical regime where single can considerably affect cavity field. Consequently, we discover unusual threshold behavior system causing jumps power, and propose model to explain effect. also measure intermode linewidth, values low 80 Hz. The tunable properties of this suggest multiple directions for future research.
Improving global navigation satellite systems (GNSS) requires a more stable basis of timekeeping. Cold-atom clocks are currently the most accurate time references, but large. This article presents an atomic clock, ``Rubiclock'', that is compact and portable, thanks to fiber-based laser bench, isotropic light cooling, atoms remain motionless during operating sequence. configuration gives clock important benefit in microgravity; measurements performed on 0-$g$ flights show better stability...
We investigate the quantum nondemolition (QND) measurement of an atomic population based on a heterodyne detection and show that induced back-action allows for preparation both spin-squeezed Dicke states. use wave-vector formalism to describe stochastic process associated evolution. Analytical formulas distribution momenta are derived in weak-coupling regime short- long-time behavior, they good agreement with those obtained by Monte Carlo simulation. The experimental implementation proposed...
A crucial point in the experimental implementation of hybrid quantum systems consisting superconducting circuits and atomic ensembles is bringing two partners close enough to each other that a strong coherent coupling can be established. Here, we propose use metallization structures half wavelength coplanar waveguide resonator as persistent current trap for ultracold paramagnetic atoms. Trapping atoms with structure itself provided by using short-ended inductively coupled resonators instead...
In this work, we implement a new method for imaging ultracold atoms with subwavelength resolution capabilities and determine its regime of validity. It uses the laser-driven interaction between excited states to engineer hyperfine ground-state population transfer in three-level system on scales much smaller than optical resolution. Subwavelength quantum gas is atypical sense that measurement itself perturbs dynamics system. To avoid induced affecting measurement, one usually “rapidly”...
We report the experimental observation and a theoretical description of scattering free falling dilute thermal clouds ${}^{87}$Rb atoms by microscopically structured light beams with parabolic-cylindrical symmetry. These are known in literature as Weber beams. High-fidelity generated means spatial modulator an annular filtering process, which yields quasipropagation-invariant electromagnetic field region interaction atom cloud. The dynamics atomic density profile phase space distribution...
We report the precise characterization of optical potential obtained by injecting a distributed-feedback erbium-doped fiber laser at 1560 nm to transverse modes folded cavity. The was mapped in situ using cold rubidium atoms, whose energy spectrally resolved thanks strong differential light shift induced on two levels probe transition. cavity is suitable for trapping atoms and eventually achieve all-optical Bose-Einstein condensation directly resonator.
We present a new scheme for controlling the quantum state of harmonic oscillator by coupling it to an anharmonic multilevel system (MLS) with first second excited transition frequency on-resonance oscillator. In this that we call "ef-resonant", spurious Kerr non-linearity inherited from MLS is very small, while its Fock states can still be selectively addressed via at depends on number photons. implement concept in circuit-QED setup microwave 3D cavity (the oscillator, 6.4 GHz and quality...
Absorption imaging is a commonly adopted method to acquire, with high temporal resolution, spatial information on partially transparent object. It relies the interference between probe beam and coherent response of In low saturation regime, it well described by Beer Lambert attenuation. this paper we theoretically derive absorption $\sigma$ polarized laser an ensemble two-level systems in any regime. We experimentally demonstrate that cross section dense $^{87}$Rb cold atom ensembles...
We propose a scheme to tailor nanostructured trapping potentials for ultracold atoms. Our combines an engineered extension of repulsive optical dipole forces at short distances and attractive Casimir-Polder long between atom surface. This extended force takes advantage excited-state dressing by plasmonically-enhanced fields doubly dress the ground state create strongly potential with spatially tunable characteristics. In this paper, we show that, under realistic experimental conditions,...
The numerical simulation of multiple scattering in dense ensembles is the mostly adopted solution to predict their complex optical response. While scalar- and vectorial-light-mediated interactions are accurately taken into account, computational complexity still limits current simulations low saturation regime ignores internal structure atoms. Here, we propose go beyond these restrictions, at constant cost, by describing a multilevel system an effective two-level that best reproduces...
The emerging field of on-chip integration nanophotonic devices and cold atoms offers extremely-strong pure light-matter interaction schemes, which may have profound impact on quantum information science. In this context, a long-standing obstacle is to achieve strong between single photons, while at the same time trap in vacuum large separation distances from dielectric surfaces. work, we study new waveguide geometries that challenge these conflicting objectives. designed photonic crystal...