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Guido Bacciagaluppi: on 4/30/21 at 0:12am UTC, wrote Quantum Limits of Knowledge 2021 Wednesday 31st March, 2021 The Bell...


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September 29, 2021

CATEGORY: Blog [back]
TOPIC: Bell Inequality Violation and Relativity of Pre- & Post-selection by Guido Bacciagaluppi, Ronnie Hermens [refresh]
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Blogger Guido Bacciagaluppi wrote on Apr. 30, 2021 @ 00:12 GMT
Quantum Limits of Knowledge 2021

Wednesday 31st March, 2021

The Bell inequalities can be violated by postselecting on the results of a measurement of the Bell states. If information about the original state preparation is available, we point out how the violation can be reproduced classically by postselecting on the basis of this information. We thus propose a variant of existing experiments that rules out such alternative explanations, by having the preparation and the postselection at spacelike separation. Unlike the timelike case where one can sharply distinguish Bell inequality violations based on pre- or postselection of a Bell state, in our scenario the distinction between these physical effects becomes foliation-dependent. We call this 'relativity of pre- and postselection'.



Keywords: #quantum #entanglement #Bell #inequalities #relativity

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