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Quantum predictions for an unmeasured system cannot be simulated with a finite-memory classical system
Stockholm University, Faculty of Science, Department of Physics. Université de Genève, Switzerland.
Number of Authors: 22018 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 97, no 3, article id 032131Article in journal (Refereed) Published
Abstract [en]

We consider an ideal experiment in which unlimited nonprojective quantum measurements are sequentially performed on a system that is initially entangled with a distant one. At each step of the sequence, the measurements are randomly chosen between two. However, regardless of which measurement is chosen or which outcome is obtained, the quantum state of the pair always remains entangled. We show that the classical simulation of the reduced state of the distant system requires not only unlimited rounds of communication, but also that the distant system has infinite memory. Otherwise, a thermodynamical argument predicts heating at a distance. Our proposal can be used for experimentally ruling out nonlocal finite-memory classical models of quantum theory.

Place, publisher, year, edition, pages
2018. Vol. 97, no 3, article id 032131
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-156073DOI: 10.1103/PhysRevA.97.032131ISI: 000428647300003OAI: oai:DiVA.org:su-156073DiVA, id: diva2:1208926
Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2018-05-21Bibliographically approved

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