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Lookup NU author(s): Dr Jonte HanceORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
We explore how one might detect the dynamical quantum Cheshire cat proposed by Aharonov et al. We show that, in practice, we need to bias the initial state by adding/subtracting a small probability amplitude ('field') of the orthogonal state, which travels with the disembodied property, to make the effect detectable (i.e. if our initial state is |↑z〉, we need to bias this with some small amount δ of state |↓z〉). This biasing, which can be done either directly or via weakly entangling the state with a pointer, effectively provides a phase reference with which we can measure the evolution of the state. The outcome can then be measured as a small probability difference in detections in a mutually unbiased basis, proportional to this biasing δ. We show this is different from counterfactual communication, which provably does not require any probe field to travel between sender Bob and receiver Alice for communication. We further suggest an optical polarisation experiment where these phenomena might be demonstrated in a laboratory.
Author(s): Hance JR, Ladyman J, Rarity JG
Publication type: Article
Publication status: Published
Journal: New Journal of Physics
Year: 2024
Volume: 26
Online publication date: 17/07/2024
Acceptance date: 17/07/2024
Date deposited: 18/07/2024
ISSN (electronic): 1367-2630
Publisher: Institute of Physics Publishing Ltd.
URL: https://doi.org/10.1088/1367-2630/ad6476
DOI: 10.1088/1367-2630/ad6476
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