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Measurements of Nonlocal Variables and Demonstration of the Failure of the Product Rule for a Pre- and Postselected Pair of Photons
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Number of Authors: 122019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 10, article id 100405Article in journal (Refereed) Published
Abstract [en]

We report the first implementation of the von Neumann instantaneous measurements of nonlocal variables, which becomes possible due to technological achievements in creating hyperentangled photons. Tests of reliability and of the nondemolition property of the measurements have been performed with high precision, showing the suitability of the scheme as a basic ingredient of numerous quantum information protocols. The method allows us to demonstrate for the first time with strong measurements a special feature of pre- and postselected quantum systems: the failure of the product rule. It has been verified experimentally that for a particular pre- and postselected pair of particles, a single measurement on particle A yields with certainty sigma(A)(x) = -1, a single measurement on particle B yields with certainty sigma(B)(y) = -1, and a single nonlocal measurement on particles A and B yields with certainty sigma(A)(x) sigma(B)(y) = -1.

Place, publisher, year, edition, pages
2019. Vol. 122, no 10, article id 100405
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Physical Sciences
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URN: urn:nbn:se:su:diva-167463DOI: 10.1103/PhysRevLett.122.100405ISI: 000461919200002OAI: oai:DiVA.org:su-167463DiVA, id: diva2:1302261
Available from: 2019-04-04 Created: 2019-04-04 Last updated: 2019-04-04Bibliographically approved

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