Spontaneous emission in quantum walks of a kicked Bose-Einstein condensate

Groiseau, Caspar; Wimberger, Sandro

doi:10.1103/physreva.99.013610

Cited by 8 publications

(7 citation statements)

References 49 publications

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“…For the future, it should be possible to translate the proposal from Ref. [61] into a feasible experiment, and to test the impact of decoherence by spontaneous emission [74] and other noise sources such as lattice vibrations on the quantum walk and the stability of topological phases [61].…”

Section: Discussionmentioning

confidence: 99%

Experimental realization of a momentum-space quantum walk

et al. 2019

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We report on a discrete-time quantum walk that uses the momentum of ultra-cold rubidium-87 atoms as the walk space and two internal atomic states as the coin degree of freedom. Each step of the walk consists of a coin toss (a microwave pulse) followed by a unitary shift operator (a resonant ratchet pulse). We carry out a comprehensive experimental study on the effects of various parameters, including the strength of the shift operation, coin parameters, noise, and initialization of the system on the behavior of the walk. The walk dynamics can be well controlled in our experiment; potential applications include atom interferometry and engineering asymmetric walks.

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Section: Discussionmentioning

confidence: 99%

Experimental realization of a momentum-space quantum walk

et al. 2019

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“…This can be improved by relatively minor changes to our atom detection system so that a wider range of momenta can be observed, possibly up to the order of about 100 momentum classes before other experimental limitations become important. The latter include a breakdown of the Raman-Nath regime because of the finite pulse width [32][33][34], decoherence by spontaneous emission [35], and vibrations of the optical setup. QWs with less diffusion between the ballistically spreading momentum currents could be achieved through the choice of an initial state composed of more momentum states [30].…”

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confidence: 99%

Quantum Walk in Momentum Space with a Bose-Einstein Condensate

et al. 2018

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We present a discrete-time, one-dimensional quantum walk based on the entanglement between the momentum of ultracold rubidium atoms (the walk space) and two internal atomic states (the "coin" degree of freedom). Our scheme is highly flexible and can provide a platform for a wide range of applications such as quantum search algorithms, the observation of topological phases, and the realization of walks with higher dimensionality. Along with the investigation of the quantum-to-classical transition, we demonstrate the distinctive features of a quantum walk and contrast them to those of its classical counterpart. Also, by manipulating either the walk or coin operator, we show how the walk dynamics can be steered or even reversed.

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“…For example, dynamically varying τ 1 and pulse period T might allow the atoms to stay longer in a long-surviving mode and thereby lead to a higher survival peak. Additionally, the ability for generating periodic atomic density distributions may find applications as state preparation for quantum ratchet [34], and quantum random walk experiments [35][36][37], since it can replace the need for a Bose-Einstein condensate.…”

Section: Discussionmentioning

confidence: 99%

Enhancing survival resonances with engineered dissipation

Chai

Andersen

2020

Phys. Rev. Research

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We investigate a scheme that enhances survival resonances in a δ-killed system through actively recycling lost atoms. The process causes atoms to dissipate into superpositions of momentum states with sustained survival when exposed to kicks of a dissipative optical standing wave. The recycling process causes momentum redistribution, which gives the atoms multiple chances to enter a long-surviving mode. The survival resonance peak height shows an improvement of a factor of 2.4. This technique can increase the sensitivity and precision of atomic interferometers based on survival resonances.

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Spontaneous emission in quantum walks of a kicked Bose-Einstein condensate

Cited by 8 publications

References 49 publications

Experimental realization of a momentum-space quantum walk

Experimental realization of a momentum-space quantum walk

Quantum Walk in Momentum Space with a Bose-Einstein Condensate

Enhancing survival resonances with engineered dissipation

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