Bell's inequality without alternative settings

Details Bell's inequality without alternative settings Bell's inequality without alternative settings

2002-10-11

arxiv.org/abs/quant-ph/0210081v2

Phys. Lett. A 313 (2003) 1

Physics

Quantum Physics

LaTeX, 13 pages, 3 figures

Scientific paper

10.1016/S0375-9601(03)00722-9

A suitable generalized measurement described by a 4-element positive operator-valued measure (POVM) on each particle of a two-qubit system in the singlet state is, from the point of view of Einstein, Podolsky, and Rosen's (EPR's) criterion of elements of reality, equivalent to a random selection between two alternative projective measurements. It is shown that an EPR-experiment with a fixed POVM on each particle provides a violation of Bell's inequality without requiring local observers to choose between the alternatives. This approach could be useful for designing a loophole-free test of Bell's inequality.

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