When does a particle arrive?
Simone Roncallo, Krzysztof Sacha, Lorenzo Maccone

TL;DR
This paper compares various theoretical proposals for measuring the arrival time of a quantum particle, identifying regimes where they make distinct, experimentally testable predictions, thus guiding future experimental efforts.
Contribution
It systematically analyzes and contrasts different quantum arrival time measurement proposals, highlighting regimes with distinguishable predictions for the first time.
Findings
Multiple regimes with inequivalent predictions identified
Different proposals are experimentally discriminable in certain regimes
Analysis facilitates future experimental testing of quantum arrival time theories
Abstract
We compare the proposals that have appeared in the literature to describe a measurement of the time of arrival of a quantum particle at a detector. We show that there are multiple regimes where different proposals give inequivalent, experimentally discriminable, predictions. This analysis paves the way for future experimental tests.
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Taxonomy
TopicsQuantum Mechanics and Applications · Cold Atom Physics and Bose-Einstein Condensates · Quantum Information and Cryptography
