Nonlocality of two- and three-mode continuous variable systems

Details Nonlocality of two- and three-mode continuous variable systems Nonlocality of two- and three-mode continuous variable systems

2004-10-25

arxiv.org/abs/quant-ph/0410194v2

J. Opt. B 7, 174 (2005)

Physics

Quantum Physics

17 pages, 7 figures. A paragraph concerning the choice of the displacement parameters has been added (Sec. 3.1). References an

Scientific paper

10.1088/1464-4266/7/6/003

We address nonlocality of a class of fully inseparable three-mode Gaussian states generated either by bilinear three-mode Hamiltonians or by a sequence of bilinear two-mode Hamiltonians. Two different tests revealing strong nonlocality are considered, in which the dichotomic Bell operator is represented by displaced parity and by pseudospin operator respectively. Three-mode states are also considered as a conditional source of two-mode non Gaussian states, whose nonlocal properties are analyzed. We found that the non Gaussian character of the conditional states allows violation of Bell's inequalities (by parity and pseudospin tests) stronger than with a conventional twin-beam state. However, the non Gaussian character is not sufficient to reveal nonlocality thorough a dichotomized quadrature measurement strategy.

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