Better Bell Inequality Violation by Collective Measurements

Details Better Bell Inequality Violation by Collective Measurements Better Bell Inequality Violation by Collective Measurements

2006-04-07

arxiv.org/abs/quant-ph/0604045v2

Physical Review A, vol. 73, art. 052116 (2006)

Physics

Quantum Physics

7 pages, 4 figures and 1 table; references updated

Scientific paper

10.1103/PhysRevA.73.052116

The standard Bell inequality experiments test for violation of local realism by repeatedly making local measurements on individual copies of an entangled quantum state. Here we investigate the possibility of increasing the violation of a Bell inequality by making collective measurements. We show that nonlocality of bipartite pure entangled states, quantified by their maximal violation of the Bell-Clauser-Horne inequality, can always be enhanced by collective measurements, even without communication between the parties. For mixed states we also show that collective measurements can increase the violation of Bell inequalities, although numerical evidence suggests that the phenomenon is not common as it is for pure states.

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