Photon subtracted states and enhancement of nonlocality in the presence of noise

Details Photon subtracted states and enhancement of nonlocality in the presence of noise Photon subtracted states and enhancement of nonlocality in the presence of noise

2005-03-10

arxiv.org/abs/quant-ph/0503104v1

J. Opt. B: Quantum and Semiclass. Opt. 7, S392 (2005)

Physics

Quantum Physics

12 pages, 7 figures

Scientific paper

10.1088/1464-4266/7/10/027

We address nonlocality of continuous variable systems in the presence of dissipation and noise. Three nonlocality tests have been considered, based on the measurement of displaced-parity, field-quadrature and pseudospin-operator, respectively. Nonlocality of twin beam has been investigated, as well as that of its non-Gaussian counterparts obtained by inconclusive subtraction of photons. Our results indicate that: i) nonlocality of twin beam is degraded but not destroyed by noise; ii) photon subtraction enhances nonlocality in the presence of noise, especially in the low-energy regime.

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