Palmero, MikelTorrontegui Muñoz, ErikMuga, Juan GonzaloModugno, Michelle2021-03-152021-03-152013-05Palmero, 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).1050-2947https://hdl.handle.net/10016/32139Quantum 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.5eng©2013 American Physical Societyresearch articleFísicahttp://dx.doi.org/10.1103/PhysRevA.87.053618open access053618-15053618-5Physical Review A87AR/0000026562