Positive phase space transformation incompatible with classical physics Export

@article{citeulike:3389623, 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.}, archivePrefix = {arXiv}, author = {Son, Wonmin and Kofler, Johannes and Kim, M. S. and Vedral, Vlatko and Brukner, Caslav}, citeulike-article-id = {3389623}, citeulike-linkout-0 = {http://arxiv.org/abs/0810.1457}, citeulike-linkout-1 = {http://arxiv.org/pdf/0810.1457}, citeulike-linkout-2 = {http://dx.doi.org/10.1103/PhysRevLett.102.110404}, day = {20}, doi = {10.1103/PhysRevLett.102.110404}, eprint = {0810.1457}, keywords = {bells-theorum, physics, quantum, quasiprobability, wigner}, month = {Mar}, posted-at = {2008-10-09 11:37:14}, priority = {2}, title = {Positive phase space transformation incompatible with classical physics}, url = {http://dx.doi.org/10.1103/PhysRevLett.102.110404}, year = {2009} }

TY - JOUR ID - citeulike:3389623 L3 - citeulike-article-id:3389623 N2 - 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. TI - Positive phase space transformation incompatible with classical physics KW - bells-theorum KW - physics KW - quantum KW - quasiprobability KW - wigner AU - Son, Wonmin AU - Kofler, Johannes AU - Kim, MS AU - Vedral, Vlatko AU - Brukner, Caslav PY - 2009/Mar/20/ UR - http://dx.doi.org/10.1103/PhysRevLett.102.110404 ER -