Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 1: Quantum Foundations
QI 1.6: Talk
Monday, March 18, 2024, 11:15–11:30, HFT-FT 101
Contextuality, Coherences, and Quantum Cheshire Cats — •Jonte Hance1,2,3, Ming Ji2, and Holger Hofmann2 — 1School of Computing, Newcastle University, 1 Science Square, Newcastle upon Tyne NE4 5TG, UK — 2Department of Quantum Matter, Graduate School of Advanced Science and Engineering, Hiroshima University, Kagamiyama 1-3-1, Higashi Hiroshima 739-8530, Japan — 3Quantum Engineering Technology Laboratories, Department of Electrical and Electronic Engineering, University of Bristol, Woodland Road, Bristol, BS8 1US, UK
We analyse the quantum Cheshire cat using contextuality theory, to see if this can tell us anything about how best to interpret this paradox. We show that this scenario can be analysed using the relation between three different measurements, which seem to result in a logical contradiction. We discuss how this contextual behaviour links to weak values, and coherences between prohibited states. Rather than showing a property of the particle is disembodied, the quantum Cheshire cat instead demonstrates the effects of these coherences, which are typically found in pre- and postselected systems. See https://iopscience.iop.org/article/10.1088/1367-2630/ad0bd4 for more details.
Keywords: weak values; contextuality; coherence; quantum Cheshire cat