A5076801186- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Photonic and Optical Devices
- Quantum Mechanics and Applications
- Neural Networks and Reservoir Computing
- Quantum Computing Algorithms and Architecture
- Mechanical and Optical Resonators
- Quantum Dots Synthesis And Properties
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Photonic Crystals and Applications
- Perovskite Materials and Applications
- Optical Network Technologies
- Topological Materials and Phenomena
- Semiconductor Quantum Structures and Devices
- Optical properties and cooling technologies in crystalline materials
- Photoacoustic and Ultrasonic Imaging
- Semiconductor Lasers and Optical Devices
- Molecular Communication and Nanonetworks
- Advanced Optical Sensing Technologies
- Near-Field Optical Microscopy
- Nonlinear Optical Materials Studies
Laboratoire Kastler Brossel
2014-2024
Collège de France
2014-2024
East China Normal University
2024
Centre National de la Recherche Scientifique
2014-2023
École Normale Supérieure - PSL
2014-2023
Sorbonne Université
2014-2023
Université Paris Sciences et Lettres
2014-2023
University of Copenhagen
2018-2022
Université de Bordeaux
2021
Laboratoire Photonique, Numérique et Nanosciences
2021
Integrated photonic circuits are one of the most promising platforms for large-scale quantum information systems due to their small physical size and stable interferometers with near-perfect lateral-mode overlaps. Since many protocols based on qubits defined by polarization photons, we must develop integrated building blocks generate, manipulate, measure polarization-encoded state a chip. The generation unit is particularly important. Here show first polarization-entangled photon pair source...
We propose and experimentally realize a novel versatile protocol that allows the quantum state engineering of heralded optical coherent-state superpositions. This scheme relies on two-mode squeezed state, linear mixing, n-photon detection. It is optimally using expensive non-Gaussian resources to build up only key part targeted state. In experimental case two-photon detection based high-efficiency superconducting nanowire single-photon detectors, freely propagating exhibits 67% fidelity with...
Recent advances in quantum technologies are rapidly stimulating the building of networks. With parallel development multiple physical platforms and different types encodings, a challenge for present future networks is to uphold heterogeneous structure full functionality therefore support modular systems that not necessarily compatible with one another. Central this endeavor capability distribute interconnect optical entangled states relying on discrete continuous variables. Here, we report...
Establishing a highly efficient photon-emitter interface where the intrinsic linewidth broadening is limited solely by spontaneous emission key step in quantum optics. It opens pathway to coherent light-matter interaction for, e.g., generation of indistinguishable photons, few-photon optical nonlinearities, and gates. However, residual mechanisms are ubiquitous need be combated. For solid-state emitters charge nuclear spin noise importance, influence photonic nanostructures on has not been...
Coherent photon-emitter interfaces offer a way to mediate efficient nonlinear photon-photon interactions, much needed for quantum information processing. Here we experimentally study the case of two-level emitter, dot, coupled single optical mode in nanophotonic waveguide. We carry out few-photon transport experiments and record statistics light reconstruct scattering matrix elements one- two-photon components. This provides direct insight complex photon interaction that contains rich...
On-chip chiral quantum light-matter interfaces, which support directional interactions, provide a promising platform for efficient spin-photon coupling, nonreciprocal photonic elements, and logic architectures. We present full-wave three-dimensional calculations to quantify the performance of conventional topological crystal waveguides as emitter-photon interfaces. Specifically, ability these structures enhance interactions while suppressing subsequent backscattering losses is quantified....
Non-Gaussian states, and specifically the paradigmatic cat state, are well known to be very sensitive losses. When propagating through damping channels, these states quickly lose their nonclassical features associated negative oscillations of Wigner function. However, by squeezing superposition decoherence process can qualitatively changed substantially slowed down. Here, as a first example, we experimentally observe reduced squeezed optical coherent-state superpositions lossy channel. To...
Transferring quantum information between distant nodes of a network is key capability. This transfer can be realized via remote state preparation where two parties share entanglement and the sender has full knowledge to communicated. Here we demonstrate such process heterogeneous functioning with different encodings, i.e., particle-like discrete-variable optical qubits wave-like continuous-variable ones. Using hybrid light as shared resource, prepare arbitrary coherent-state superpositions...
Einstein-Podolsky-Rosen steering is known to be a key resource for one-sided device-independent quantum information protocols. Here we demonstrate using hybrid entanglement between continuous- and discrete-variable optical qubits. To this end, report on suitable inequalities detail the implementation requirements demonstration. Steering experimentally certified by observing violation more than 5 standard deviations. Our results illustrate potential of applications in heterogeneous networks...
Abstract The generation and manipulation of hybrid entanglement light involving discrete- continuous-variable states have recently appeared as essential resources towards the realization heterogeneous quantum networks. Here we investigate a scheme for remote between particle-like wave-like optical qubits based on non-local heralding photon detection. We also extend this with additional local or detections. An allows resulting state to exhibit higher fidelity targeted entangled while...
In the search for materials quantum information science applications, colloidal semiconductor nanoplatelets (NPLs) have emerged as a highly promising class of due to their interesting optical properties, such narrow emission line widths and fast photoluminescence (PL) lifetimes at room temperature. So far, only few works focused on properties emission; however, NPLs, with atomic-scale thickness one-dimensional confinement, are candidates single-photon sources. Here, we demonstrate...
We report on high-efficiency superconducting nanowire single-photon detectors based amorphous tungsten silicide and optimized at 1064 nm. At an operating temperature of 1.8 K, we demonstrated a 93% system detection efficiency this wavelength with dark noise few counts per second. Combined cavity-enhanced spontaneous parametric downconversion, fiber-coupled detector enabled us to generate narrowband single photons heralding greater than 90% high spectral brightness 0.6×104 photons/(s·mW·MHz)....
Optics experiments critically require the stable and accurate locking of relative phases between light beams or stabilization Fabry-Perot cavity lengths. Here, we present a simple inexpensive technique based on stand-alone microcontroller unit to perform such tasks. Easily programmed in C language, this reconfigurable digital system also enables automatic relocking sequential functioning. Different algorithms are detailed applied fringe low- high-finesse optical stabilization, without need...
Abstract Realizing a sensitive photon-number-dependent phase shift on light beam is required both in classical and quantum photonics. It may lead to new applications for photonics machine learning or pave the way realizing photon-photon gate operations. Nonlinear phase-shifts require efficient light-matter interaction, recently dots coupled nanophotonic devices have enabled near-deterministic single-photon coupling. We experimentally realize an optical of 0.19 π ± 0.03 radians ( ≈ 34...
Abstract Coherent quantum optics, where the phase of a photon is not scrambled as it interacts with an emitter, lies at heart many optical effects and emerging technologies. Solid-state emitters coupled to nanophotonic waveguides are promising platform for devices, this element can be integrated into complex photonic chips. Yet, preserving full coherence properties emitter-waveguide system challenging because dynamic electromagnetic landscape found in solid state. Here, we review progress...
Achieving pure single-photon emission is essential for a range of quantum technologies, from computing to key distribution metrology. Among solid-state emitters, colloidal lead halide perovskite (LHP) nanocrystals (NCs) have attracted considerable interest due their structural and optical properties, which make them attractive candidates sources (SPSs). However, practical utilization has been hampered by environment-induced instabilities. In this study, we fabricate characterize in...
Conditional preparation is a well-established technique for quantum state engineering of light. A general trend to increase the number heralding detection events in such realization reach larger photon-number states or their arbitrary superpositions. In contrast pulsed implementations, where detections only occur within pulse window, continuous-wave light temporal separation conditioning an additional degree freedom and critical parameter. Based on theoretical study by A.E.B. Nielsen K....
Advanced quantum technologies, as well fundamental tests of physics, crucially require the interference multiple single photons in linear-optics circuits. This can result bunching into higher Fock states, leading to a complex bosonic behaviour. These challenging tasks timely develop collective criteria benchmark many independent initial resources. Here we determine whether n imperfect ultimately bunch state $|n \rangle$. We thereby introduce an experimental Fock-state capability for...
We derive a compact expression for the second-order correlation function [Formula: see text] of quantum state in terms its Wigner function, thereby establishing direct link between and state's shape phase space. conduct an experiment that simultaneously measures through photocounting reconstructs via homodyne tomography. The results confirm our theoretical predictions.This article is part theme issue 'The theory light'.
In the search for materials quantum information science applications, colloidal semiconductor nanoplatelets (NPLs) have emerged as a highly promising new class of due to their interesting optical properties, such narrow emission linewidth and fast photoluminescence (PL) lifetimes at room temperature. So far only few works focused on properties emission, however, NPLs, with atomic-scale thickness one-dimensional confinement, are candidates single-photon sources. Here, we demonstrate...
We relate the second-order correlation function g (2) (0) to state’s phase space Wigner function. Our experiment measures via direct photocounting and re-constructs homodyne tomography, validating our theoretical findings.
We report on the remote preparation of arbitrary continuous-variable qubits by conditionning results homodyne measurements performed a hybrid-entangled state. Using this scheme we explore possibility demonstrating quantum steering.