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Detecting quantum backflow by the density of a Bose-Einstein Condensate

Quantum backflow is a classically forbidden effect consisting in a negative flux for states with negligible negative momentum components. It has never been observed experimentally so far. We derive a general relation that connects backflow with a critical value of the particle density, paving the way for the detection of backflow by a density measurement. To this end, we propose an explicit scheme with Bose-Einstein condensates, at reach with current experimental technologies. Remarkably, the application of a positive momentum kick, via a Bragg pulse, to a condensate with a positive velocity may cause a current flow in the negative direction.

preprint2013arXivOpen access
M. PalmeroE. TorronteguiM. ModugnoJ. G. Muga
cond-mat.quant-gasquant-ph
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Open access4 authors2 topics
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M. PalmeroE. TorronteguiM. ModugnoJ. G. Muga

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