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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.
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.
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.
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.
The monochromatic driving of a quantum system is a successful technique in quantum simulations, well captured by an effective Hamiltonian approach, and with applications in artificial gauge fields and topological engineering. Here, we investigate multichromatic Floquet driving for quantum simulation. Within a well-defined range of parameters, we show that the time coarse-grained dynamics of such a driven closed quantum system is encapsulated in an effective master equation for the time-averaged density matrix, that evolves under the action of an effective Hamiltonian and tunable Lindblad-type dissipation or quantum gain terms. As an application, we emulate the dissipation induced by phase noise and incoherent emission or absorption processes in the bichromatic driving of a two-level system, and reproduce the phase decoherence in a harmonic oscillator model.
Sujets
Bose-Einstein Condensate
Diffraction de Bragg
Réseau optique
Floquet theory
Condensation
Condensats de Bose-Einstein
Condensation de bose-Einstein
Mechanics
Effet tunnel dynamique
Fresnel lens
Effet rochet
Mirror-magneto-optical trap
Bose Einstein condensate
Bragg Diffraction
Periodic potentials
Atomic beam
Quantum optimal control
Onde de matière
Quantum chaos
Nano-lithography
Bose-Einstein condensate
Espace des phases
Constraint
Chaos quantique
Gaz quantique
Atom chip
Numerical methods
Optical
Bose Einstein Condensation
Césium
Fluid
Théorie de Floquet
Optical molasses
Gaz quantiques
Chaos
Hamiltonian
Réseaux optiques
Atom laser
Time dependence
Lentille de Fresnel
Ouvertures métalliques sub-longueur d'onde
Experimental results
Plasmon polariton de surface
Nano-lithographie
Bose-Einstein condensates Coherent control Cold atoms and matter waves Cold gases in optical lattices
Quantum collisions
Matter wave
Contrôle optimal
Field equations stochastic
Effet tunnel
Atomes froids
Dimension
Condensat Bose-Einstein
Entropy production
Bose–Einstein condensates
Couches mono-moléculaire auto assemblées
Fluorescence microscopy
Lattice
Approximation semi-classique et variationnelle
Bragg scattering
Masques matériels nanométriques
Optique atomique
Microscopie de fluorescence
Optical tweezers
Jet atomique
Contrôle optimal quantique
Dynamical tunneling
Collisions ultrafroides
Maxwell's demon
Chaos-assisted tunneling
Engineering
Initial state
Cold atoms
Beam splitter
Optical lattice
Optimal control theory
Levitodynamics
Non-adiabatic regime
Bose-Einstein condensates
Matter waves
Bose-Einstein
Condensats de Bose– Einstein
Bose-Einstein Condensates
Atomes ultrafroids dans un réseau optique
Condensats de Bose Einstein
Quantum
Quantum control
Mélasse optique
Ultracold atoms
Puce atomique
Physique quantique
Effet tunnel assisté par le chaos
Phase space
Current
Electromagnetic field
Piège magnéto-optique à miroir
Atom optics
Condensat de Bose-Einstein
Optical lattices