Stronger Quantum Correlations with Loophole-free Post-selection

Details Stronger Quantum Correlations with Loophole-free Post-selection Stronger Quantum Correlations with Loophole-free Post-selection

2011-02-07

arxiv.org/abs/1102.1438v4

Phys. Rev. Lett. 107, 120402 (2011)

Physics

Quantum Physics

4 pages, 2 figures, substantially revised in response to referee suggestions

Scientific paper

10.1103/PhysRevLett.107.120402

One of the most striking non-classical features of quantum mechanics is in the correlations it predicts between spatially separated measurements. In local hidden variable theories, correlations are constrained by Bell inequalities, but quantum correlations violate these. However, experimental imperfections lead to "loopholes" whereby LHV correlations are no longer constrained by Bell inequalities, and violations can be described by LHV theories. For example, loopholes can emerge through selective detection of events. In this letter, we introduce a clean, operational picture of multi-party Bell tests, and show that there exists a non-trivial form of loophole-free post-selection. Surprisingly, the same post-selection can enhance quantum correlations, and unlock a connection between non-classical correlations and non-classical computation.

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