Quantum correlations in the temporal Clauser-Horne-Shimony-Holt (CHSH) scenario

Details Quantum correlations in the temporal Clauser-Horne-Shimony-Holt (CHSH) scenario Quantum correlations in the temporal Clauser-Horne-Shimony-Holt (CHSH) scenario

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12h3055f&link_type=abstract

New Journal of Physics, Volume 12, Issue 8, pp. 083055 (2010).

Physics

1

Scientific paper

We consider a temporal version of the Clauser-Horne-Shimony-Holt (CHSH) scenario using projective measurements on a single quantum system. It is known that quantum correlations in this scenario are fundamentally more general than correlations obtainable with the assumptions of macroscopic realism and non-invasive measurements. In this paper, we also educe some fundamental limitations of these quantum correlations. One result is that a set of correlators can appear in the temporal CHSH scenario if and only if it can appear in the usual spatial CHSH scenario. In particular, we derive the validity of the Tsirelson bound and the impossibility of Popescu-Rohrlich (PR)-box behavior. The strength of possible signaling also turns out to be surprisingly limited, giving a maximal communication capacity of approximately 0.32 bit. We also find a temporal version of Hardy's non-locality paradox with a maximal quantum value of 1/4.

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