Detecting quantum backflow by the density of a Bose-Einstein Condensate
Quantum Physics
2014-11-21 v2 Quantum Gases
Abstract
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.
Cite
@article{arxiv.1302.3373,
title = {Detecting quantum backflow by the density of a Bose-Einstein Condensate},
author = {M. Palmero and E. Torrontegui and M. Modugno and J. G. Muga},
journal= {arXiv preprint arXiv:1302.3373},
year = {2014}
}
Comments
5 pages, 4 figures