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

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URI: https://hdl.handle.net/10016/32139
ISSN: 1050-2947
DOI: http://dx.doi.org/10.1103/PhysRevA.87.053618
UXXI: AR/0000026562
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Detecting_PRA_2013.pdf (472.77 KB)
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2013-05
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American Physical Society
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Quantum backflow is a classically forbidden effect consisting of 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.
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Palmero, M., Torrontegui, E., Muga, J. G. y Modugno, M. (2013). Detecting quantum backflow by the density of a Bose-Einstein condensate. Physical Review A, 87(5).
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