Effect of noise and enhancement of nonlocality in on/off photodetection

Details Effect of noise and enhancement of nonlocality in on/off photodetection Effect of noise and enhancement of nonlocality in on/off photodetection

2005-07-06

arxiv.org/abs/quant-ph/0507057v1

Phys. Rev. A 72, 042105 (2005).

Physics

Quantum Physics

21 Figures

Scientific paper

10.1103/PhysRevA.72.042105

Nonlocality of two-mode states of light is addressed by means of CHSH inequality based on displaced on/off photodetection. Effects due to non-unit quantum efficiency and nonzero dark counts are taken into account. Nonlocality of both balanced and unbalanced superpositions of few photon-number states, as well as that of multiphoton twin beams, is investigated. We find that unbalanced superpositions show larger nonlocality than balanced one when noise affects the photodetection process. De-Gaussification by means of (inconclusive) photon subtraction is shown to enhance nonlocality of twin beams in the low energy regime. We also show that when the measurement is described by a POVM, rather than a set of projectors, the maximum achievable value of the Bell parameter in the CHSH inequality is decreased, and is no longer given by the Cirel'son bound.

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