Experiment-friendly formulation of quantum backflow

Abstract

Quantum backflow is usually understood as a quantum interference phenomenon where probability current of a quantum particle points in the opposite direction to particle's momentum. Here, we quantify the amount of quantum backflow for arbitrary momentum distributions, paving the way towards its experimental verification. We give examples of backflow in gravitational and harmonic potential, and discuss experimental procedures required for the demonstration using atomic gravimeters. Such an experiment would show that the probability of finding a free falling particle above initial level could grow for suitably prepared quantum state with most momentum downwards.

arXiv commentAccepted for publication in Quantum. Multiple minor corrections and improvements

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Cited by in corpus (11)

• Demonstrating backflow in classical two beams' interference
• On the experiment-friendly formulation of quantum backflow
• Unbounded quantum backflow in two dimensions
• Time-of-arrival distributions for continuous quantum systems and application to quantum backflow
• Observation of single-photon azimuthal backflow with weak measurement
• Quantum Back Flow Across a Black Hole Horizon in a Toy Model Approach
• Different routes to the classical limit of backflow
• Quantum backflow current in a ring: Optimal bounds and fractality
• Quantum backflow for two identical particles
• Searching for Bloch wave packets with almost definite momentum direction
• Preparing Quantum Backflow States by Large Momentum Transfer