Quantum nonlocality test for continuous-variable states with dichotomic observables

Details Quantum nonlocality test for continuous-variable states with dichotomic observables Quantum nonlocality test for continuous-variable states with dichotomic observables

2002-10-14

arxiv.org/abs/quant-ph/0210110v2

Phys. Rev. A 67, 012106 (2003)

Physics

Quantum Physics

7 pages, 3 figures, two references added, to appear in Phys.Rev.A

Scientific paper

10.1103/PhysRevA.67.012106

There have been theoretical and experimental studies on quantum nonlocality for continuous variables, based on dichotomic observables. In particular, we are interested in two cases of dichotomic observables for the light field of continuous variables: One case is even and odd numbers of photons and the other case is no photon and presence of photons. We analyze various observables to give the maximum violation of Bell's inequalities for continuous-variable states. We discuss an observable which gives the violation of Bell's inequality for any entangled pure continuous variable state. However, it does not have to be a maximally entangled state to give the maximal violation of Bell's inequality. This is attributed to a generic problem of testing the quantum nonlocality of an infinite-dimensional state using a dichotomic observable.

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