A5071018803- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Optical Network Technologies
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Quantum and electron transport phenomena
- Quantum Mechanics and Applications
- Strong Light-Matter Interactions
- Laser-Matter Interactions and Applications
- Optical Coherence Tomography Applications
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Mechanical and Optical Resonators
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Quantum Chemical Studies
- Prenatal Screening and Diagnostics
- Nuclear Physics and Applications
- Optical and Acousto-Optic Technologies
- Orbital Angular Momentum in Optics
- Near-Field Optical Microscopy
Humboldt-Universität zu Berlin
2021-2023
Laboratoire Traitement et Communication de l’Information
2016-2020
Télécom Paris
2017-2020
Université Paris-Saclay
2018-2019
Laboratoire de Photonique Quantique et Moléculaire
2016-2019
CEA Paris-Saclay
1988
Waveguide QED with cold atoms provides a potent platform for the study of non-equilibrium, many-body, and open-system quantum dynamics. Even weak coupling strong photon loss, collective enhancement light-atom interactions leads to correlations photons arising in transmission, as shown recent experiments. Here we apply an improved mean-field theory based on higher-order cumulant expansions describe experimentally relevant, but theoretically elusive, regime driving large ensembles. We...
We present a theoretical analysis of nearly monochromatic light propagation through gas two-level atoms using the Heisenberg-Langevin equation method. Our focus is on evolution photon annihilation operator and its impact second-order correlation function, $g^{(2)}({\tau})$, with particular emphasis antibunching behavior. The model accounts for both open closed atomic system approximations, including Doppler broadening influence pump field detuning. derive expressions that reproduce known...
Abstract The interaction of light with a single two-level emitter is the most fundamental process in quantum optics, and key to many applications. As distinctive feature, two photons are never detected simultaneously scattered by emitter. This commonly interpreted saying that can only absorb emit photons. However, it has been theoretically proposed photon anticorrelations be thought as arising from interference between possible two-photon scattering amplitudes, which one refers coherent...
Abstract Raman-scattering noise in silica has been the key obstacle toward realisation of high quality fiber-based photon-pair sources. Here, we experimentally demonstrate how to get past this limitation by dispersion tailoring a xenon-filled hollow-core photonic crystal fiber. The source operates at room temperature, and is designed generate Raman-free photon-pairs useful wavelength ranges, with idler telecom, signal visible range. We achieve coincidence-to-accidentals ratio as 2740...
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Understanding cladding properties is crucial for designing microstructured optical fibers. This particularly acute Inhibited-Coupling guiding fibers because of the reliance their core guidance on and mode-field overlap integral. Consequently, careful planning fiber parameters allows obtaining with optimized characteristics such as low loss broad transmission bandwidth. In this manuscript, we report how one can tailor modal hollow-core photonic crystal by adequately modifying cladding. We...
Controlling the photon statistics of light is paramount for quantum science and technologies. Recently, we demonstrated that transmitting resonant laser past an ensemble two-level emitters can result in a stream single photons or excess pairs. This transformation due to interference between transmitted incoherently scattered pairs [Prasad et al., Nat. Photonics 14, 719 (2020)]. Here, using dispersion atomic medium, actively control relative phase these two components. We thereby realize...
We report on the experimental characterization of a novel nonlinear liquid-filled hollow-core photonic crystal fiber for generation photon pairs at telecommunication wavelength through spontaneous four-wave mixing (SFWM). show that optimization procedure in view this application links choice liquid to design parameters fiber, and we give an example such telecom wavelengths. Combining modeling classical techniques these wavelengths, identify chosen combination SFWM phase-matching frequency...
We report on the realization and characterization of a novel magic-wavelength nanofiber-based two-color optical dipole trap that allows us to generate periodic one-dimensional array trapping sites with spacing significantly smaller than half resonant wavelength cesium D2-line. To this end, we launch blue-detuned partial standing wave two red-detuned light fields through nanofiber. demonstrate atoms in characterize resulting configuration by measuring frequencies three directions observe good...
We model and investigate the collective nonlinear optical response of an ensemble two-level emitters that are weakly coupled to a single-mode waveguide. Our approach generalizes insight photon-photon correlations in light scattered by single emitter result from two-photon interference case many emitters. Using our model, we study different configurations for probing ensemble, e.g., through waveguide or via external illumination, derive analytical expressions second-order quantum coherence...
Four-wave mixing in liquid-filled hollow-core photonic-crystal fibers allows (i) to engineer the two-photon state produce either pure heralded single photons or polarization-entangled photon pairs (ii) reduce Raman scattering noise.
The interaction of light with a two-level emitter is the most fundamental process in quantum optics and key to many applications science technology. One peculiarity that two photons are never simultaneously detected scattered by single emitter. This commonly interpreted mean can only absorb emit photons. Here we show spectrally filtering fluorescence such an emitter, remaining consists stream photon pairs have been [1].
Photon pair generation through four-wave mixing in photonic crystal fibers is highly sensitive to cladding pitch-induced fluctuation of the phase matching along fiber. Our model describes its consequence on spectrum.
We experimentally show how multiband dispersion properties of inhibited-coupling hollow-core fibers allow to control the spectral correlations photon pairs generated through four-wave-mixing in a fiber filled with non-linear gas.
We report on a Raman-free heralded single-photon source based xenon-filled hollowcore fiber pumped with GHz-repetition rate femtosecond laser. The measured brightness of 720 kHz is one order magnitude improvement over our previous demonstration.
Waveguide QED with cold atoms provides a potent platform for the study of non-equilibrium, many-body, and open-system quantum dynamics. Even weak coupling strong photon loss, collective enhancement light-atom interactions leads to correlations photons arising in transmission, as shown recent experiments. Here we apply an improved mean-field theory based on higher-order cumulant expansions describe experimentally relevant, but theoretically elusive, regime driving large ensembles. We...
Photon-pairs generated by spontaneous four-wave mixing (SFWM) in inhibited-coupling hollow-core photonic crystal fiber (IC-HCPCF) filled with an inert gas (Xenon) combine Raman free generation, high signal-to-noise ratio, entanglement control and integrability the telecommunications network [1]. Furthermore, this technology proved to be a promising platform for both single photon entangled photon-pairs sources. However, increasing brightness of such is required. Recently, we demonstrated...
Interference phenomena are at the origin of many intriguing effects in physics, particular field quantum optics. Here, we present a novel type interferometer, which realizes interference two-photon component an incoming laser light. As consequence, it converts light into stream single photons or photonpairs. In this beam splitters and phase shifter interferometer realized using cold atoms, trapped optically interfaced with optical nanofiber (see Fig. 1.a).
Summary form only given. Optical fibre (either classical or microstructured) is a favourable medium for realization of sources entangled photons quantum communications. Indeed the photon pairs are generated through spontaneous Four Wave Mixing (FWM) directly in core and can thus be connected easily without loss to optical telecommunication network.We have realized such source characterized its performance. Our measurements showed pair generation rate lower than expected theory. Further...
Fibered sources of photon pairs can be easily integrated into future quantum communication networks. However, in silica-core fibres, the broadband spectrum spontaneous Raman scattering strongly contributes to uncorrelated noise photons degrading quality source. To overcome problem silica scattering, a new architecture was recently proposed, with hollow-core photonic crystal fibers (LF-HCPF) whose core and cladding are filled non-linear liquid. As opposed silica, which is continuous, liquids...