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On the experiment-friendly formulation of quantum backflow

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Barbier,  Maximilien
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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2103.06728.pdf
(Preprint), 728KB

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Citation

Barbier, M., & Goussev, A. (2021). On the experiment-friendly formulation of quantum backflow. Quantum, 5, 536-536.


Cite as: https://hdl.handle.net/21.11116/0000-0009-5FC8-C
Abstract
In its standard formulation, quantum backflow is a classically impossible phenomenon in which a free quantum particle in a positive-momentum state exhibits a negative probability current. Recently, Miller et al. [Quantum 5, 379 (2021)] have put forward a new, "experiment-friendly" formulation of quantum backflow that aims at extending the notion of quantum backflow to situations in which the particle's state may have both positive and negative momenta. Here, we investigate how the experiment-friendly formulation of quantum backflow compares to the standard one when applied to a free particle in a positive-momentum state. We show that the two formulations are not always compatible. We further identify a parametric regime in which the two formulations appear to be in qualitative agreement with one another.