Guided atom laser: a new tool for guided atom optics

Billy, Juliette; Josse, Vincent; Zuo, Zhanchun; Guerin, William; Aspect, Alain; Bouyer, Philippe

doi:10.1051/anphys:2008001

Cited by 10 publications

(20 citation statements)

References 38 publications

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“…On the other hand, the principle of an atom laser [10,11] can be used for this purpose, as was recently demonstrated in Refs. [12][13][14][15]. In these experiments, a coherent matter-wave beam was injected from a Bose-Einstein condensate in a trap into an optical waveguide.…”

Section: Introductionmentioning

confidence: 99%

Transport of ultracold Bose gases beyond the Gross-Pitaevskii description

2010

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We explore atom-laser-like transport processes of ultracold Bose-condensed atomic vapors in mesoscopic waveguide structures beyond the Gross-Pitaevskii mean-field theory. Based on a microscopic description of the transport process in the presence of a coherent source that models the outcoupling from a reservoir of perfectly Bose-Einstein condensed atoms, we derive a system of coupled quantum evolution equations that describe the dynamics of a dilute condensed Bose gas in the framework of the Hartree-Fock-Bogoliubov approximation. We apply this method to study the transport of dilute Bose gases through an atomic quantum dot and through waveguides with disorder. Our numerical simulations reveal that the onset of an explicitly time-dependent flow corresponds to the appearance of strong depletion of the condensate on the microscopic level and leads to a loss of global phase coherence.

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Section: Introductionmentioning

confidence: 99%

Transport of ultracold Bose gases beyond the Gross-Pitaevskii description

2010

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“…imentally, with the effect of interactions on the transmission coefficient demonstrated [24][25][26]. An increase in the transmission rate with atom number has been shown using numerical simulations [27] and demonstrated exper-imentally [28], while the dependence of transmission on barrier height has also been experimentally verified [29].…”

Section: Introductionmentioning

confidence: 77%

Quantum tunneling dynamics of an interacting Bose-Einstein condensate through a Gaussian barrier

et al. 2018

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The transmission of an interacting Bose-Einstein condensate incident on a repulsive Gaussian barrier is investigated through numerical simulation. The dynamics associated with interatomic interactions are studied across a broad parameter range not previously explored. Effective 1D Gross-Pitaevskii equation (GPE) simulations are compared to classical Boltzmann-Vlasov equation (BVE) simulations in order to isolate purely coherent matterwave effects. Quantum tunneling is then defined as the portion of the GPE transmission not described by the classical BVE. An exponential dependence of transmission on barrier height is observed in the classical simulation, suggesting that observing such an exponential dependence is not a sufficient condition for quantum tunneling. Furthermore, the transmission is found to be predominately described by classical effects, although interatomic interactions are shown to modify the magnitude of the quantum tunneling. Interactions are also seen to affect the amount of classical transmission, producing transmission in regions where the non-interacting equivalent has none. This theoretical investigation clarifies the contribution quantum tunneling makes to overall transmission in many-particle interacting systems, potentially informing future tunneling experiments with ultracold atoms. arXiv:1808.07196v2 [quant-ph]

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“…This turns out to be an advantage of this kind of tunnel barrier since one can achieve pretty high transmission probability for a single barrier as experimentally demonstrated in [21]. This is a feature that is difficult, if not impossible, to obtain using an optimally focussed blue detuned laser to realize a repulsive barrier for atoms because of the diffraction limit [30].…”

Section: Spatial Gaps As Tunnel Barriers For Matter Wavesmentioning

confidence: 94%

Band-gap structures for matter waves

et al. 2015

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Spatial gaps correspond to the projection in position space of the gaps of a periodic structure whose envelope varies spatially. They can be easily generated in cold atomic physics using finitesize optical lattice, and provide a new kind of tunnel barriers which can be used as a versatile tool for quantum devices. We present in detail different theoretical methods to quantitatively describe these systems, and show how they can be used to realize in one dimension matter wave Fabry-Perot cavities. We also provide experimental and numerical results that demonstrate the interest of spatial gaps structures for phase space engineering. We then generalize the concept of spatial gaps in two dimensions and show that this enables to design multiply connected cavities which generate a quantum dot structure for atoms or allow to construct curved wave guides for matter waves. At last, we demonstrate that modulating in time the amplitude of the periodic structure offers a wide variety of possible atom manipulations including the control of the scattering of an incoming wave packet, the loading of cavities delimited by spatial gaps, their coupling by multiphonon processes or the realization of a tunable source of atoms. This large range of possibilities offered by space and time engineering of optical lattices demonstrates the flexibility of such band gap structures for matter wave control, quantum simulators and atomtronics.

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Guided atom laser: a new tool for guided atom optics

Cited by 10 publications

References 38 publications

Transport of ultracold Bose gases beyond the Gross-Pitaevskii description

Transport of ultracold Bose gases beyond the Gross-Pitaevskii description

Quantum tunneling dynamics of an interacting Bose-Einstein condensate through a Gaussian barrier

Band-gap structures for matter waves

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