Positive Phase Space Transformation Incompatible with Classical Physics

Autor(en)

Wonmin Son, Johannes Kofler, Myungshik Kim, Vlatko Vedral, Caslav Brukner

Abstrakt

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.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

National University of Singapore (NUS), Queen's University Belfast, University of Leeds

Journal

Physical Review Letters

Band

102

Anzahl der Seiten

4

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.102.110404

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

103026 Quantenoptik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/7c802a94-6f36-46ae-8864-773a8fc6f29b