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The effective control of atomic coherence with cold atoms has made atom interferometry an essential tool for quantum sensors and precision measurements. The performance of these interferometers is closely related to the operation of large wave packet separations. We present here a novel approach for atomic beam splitters based on the stroboscopic stabilization of quantum states in an accelerated optical lattice. The corresponding Floquet state is generated by optimal control protocols. In this way, we demonstrate an unprecedented Large Momentum Transfer (LMT) interferometer, with a momentum separation of 600 photon recoils ($600\hbar k$) between its two arms. Each LMT beam splitter is realized in a remarkably short time (2 ms) and is highly robust against the initial velocity dispersion of the wave packet and lattice depth fluctuations. Our study shows that Floquet engineering is a promising tool for exploring new frontiers in quantum physics at large scales, with applications in quantum sensing and testing fundamental physics.

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We numerically study the optimal control of an atomic Bose-Einstein condensate in an optical lattice. We present two generalizations of the gradient-based algorithm, GRAPE, in the non-linear case and for a two-dimensional lattice. We show how to construct such algorithms from Pontryagin’s maximum principle. A wide variety of target states can be achieved with high precision by varying only the laser phases setting the lattice position. We discuss the physical relevance of the different results and the future directions of this work.

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Microscopically probing quantum many-body systems by resolving their constituent particles is essential for understanding quantum matter. In most physical systems, distinguishing individual particles, such as electrons in solids, or neutrons and quarks in neutron stars, is impossible. Atombased quantum simulators offer a unique platform that enables the imaging of each particle in a many-body system. Until now, however, this capability has been limited to quantum systems in discretized space such as optical lattices and tweezers, where spatial degrees of freedom are quantized. Here, we introduce a novel method for imaging atomic quantum many-body systems in the continuum, allowing for in situ resolution of every particle. We demonstrate the capabilities of our approach on a two-dimensional atomic Fermi gas. We probe the density correlation functions, resolving their full spatial functional form, and reveal the shape of the Fermi hole arising from Pauli exclusion as a function of temperature. Our method opens the door to probing strongly-correlated quantum gases in the continuum with unprecedented spatial resolution, providing in situ access to spatially resolved correlation functions of arbitrarily high order across the entire system.

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In the absence of external forcing, all trajectories on the phase plane of the van der Pol oscillator tend to a closed, periodic, trajectory -- the limit cycle -- after infinite time. Here, we drive the van der Pol oscillator with an external time-dependent force to reach the limit cycle in a given finite time. Specifically, we are interested in minimising the non-conservative contribution to the work when driving the system from a given initial point on the phase plane to any final point belonging to the limit cycle. There appears a speed limit inequality, which expresses a trade-off between the connection time and cost -- in terms of the non-conservative work. We show how the above results can be { generalized to the broader family of non-linear oscillators given by} the Liénard equation. Finally, we also look into the problem of minimising the total work done by the external force.

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The dynamics of a system composed of elastic hard particles confined by an isotropic harmonic potential are studied. In the low-density limit, the Boltzmann equation provides an excellent description, and the system does not reach equilibrium except for highly specific initial conditions: it generically evolves toward and stays in a breathing mode. This state is periodic in time, with a Gaussian velocity distribution, an oscillating temperature, and a density profile that oscillates as well. We characterize this breather in terms of initial conditions and constants of the motion. For low but finite densities, the analysis requires taking into account the finite size of the particles. Under well-controlled approximations, a closed description is provided, which shows how equilibrium is reached at long times. The (weak) dissipation at work erodes the breather's amplitude, while concomitantly shifting its oscillation frequency. An excellent agreement is found between molecular dynamics simulation results and the theoretical predictions for the frequency shift. For the damping time, the agreement is not as accurate as for the frequency and the origin of the discrepancies is discussed.

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Sujets

Diffraction de Bragg Microscopie de fluorescence Bose-Einstein Condensates Piège magnéto-optique à miroir Atom optics Plasmon polariton de surface Chaos Réseau optique Levitodynamics Effet rochet Quantum chaos Approximation semi-classique et variationnelle Bose-Einstein Condensate Effet tunnel assisté par le chaos Chaos-assisted tunneling Entropy production Beam splitter Mélasse optique Atomic beam Gaz quantique Dimension Nano-lithography Optical molasses Effet tunnel dynamique Physique quantique Bose Einstein Condensation Contrôle optimal quantique Electromagnetic field Condensats de Bose-Einstein Optimal control theory Fluid Bose-Einstein condensates Lattice Couches mono-moléculaire auto assemblées Césium Maxwell's demon Ultracold atoms Constraint Puce atomique Optical lattices Condensats de Bose– Einstein Dynamical tunneling Collisions ultrafroides Espace des phases Time dependence Ouvertures métalliques sub-longueur d'onde Bragg scattering Phase space Bragg Diffraction Field equations stochastic Contrôle optimal Jet atomique Periodic potentials Théorie de Floquet Current Optical Initial state Bose-Einstein Fresnel lens Floquet theory Bose Einstein condensate Masques matériels nanométriques Bose-Einstein condensate Condensats de Bose Einstein Condensat Bose-Einstein Matter waves Experimental results Optical tweezers Bose–Einstein condensates Onde de matière Engineering Condensat de Bose-Einstein Gaz quantiques Effet tunnel Atom laser Matter wave Lentille de Fresnel Cold atoms Non-adiabatic regime Bose-Einstein condensates Coherent control Cold atoms and matter waves Cold gases in optical lattices Chaos quantique Mechanics Atomes ultrafroids dans un réseau optique Mirror-magneto-optical trap Quantum Atomes froids Optique atomique Optical lattice Atom chip Fluorescence microscopy Nano-lithographie Quantum optimal control Condensation Quantum collisions Numerical methods Condensation de bose-Einstein Quantum control Réseaux optiques Hamiltonian

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81