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arXiv · 0810.1457

Positive phase space transformation incompatible with classical physics

Wonmin Son·Johannes Kofler·M. S. Kim·Vlatko Vedral·Caslav Brukner
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Abstract

Bell conjectured that a positive Wigner function does not allow violation of the inequalities imposed by local hidden variable theories. A requirement for this conjecture is "when phase space measurements are performed". We introduce the theory-independent concept of "operationally local transformations" which refers to the change of the switch on a local measurement apparatus. We show that two separated parties, performing only phase space measurements on a composite quantum system with a positive Wigner function and performing only operationally local transformations that preserve this positivity, can nonetheless violate Bell's inequality. Such operationally local transformations are realized using entangled ancillae.

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Wonmin Son, Johannes Kofler, M. S. Kim, Vlatko Vedral, Caslav Brukner. 2009-03-20. Positive phase space transformation incompatible with classical physics. https://doi.org/10.1103/physrevlett.102.110404

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