Failure of Local Realism Revealed by Extremely Coarse-Grained Measurements

Details Failure of Local Realism Revealed by Extremely Coarse-Grained Measurements Failure of Local Realism Revealed by Extremely Coarse-Grained Measurements

2008-06-22

arxiv.org/abs/0806.3558v2

Phys. Rev. Lett. 102, 060403 (2009)

Physics

Quantum Physics

4 pages, 3 figures, RevTeX4

Scientific paper

10.1103/PhysRevLett.102.060403

We show that failure of local realism can be revealed to observers for whom only extremely coarse-grained measurements are available. In our instances, Bell's inequality is violated even up to the maximum limit while both the local measurements and the initial local states under scrutiny approach the classical limit. Furthermore, we can observe failure of local realism when an inequality enforced by non-local realistic theories is satisfied. This suggests that locality alone may be violated while realism cannot be excluded for specific observables and states. Small-scale experimental demonstration of our examples may be possible in the foreseeable future.

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