We address the nonlocality 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 nonlocality are considered, in which thedichotomic Bell operator is represented by the displaced parity andbythe pseudospin operator respectively. Three-mode states arealso considered as a conditional source of two-mode non-Gaussian states,whose nonlocality properties are analysed. 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 sufficienttoreveal nonlocality through a dichotomized quadrature measurement strategy.
|Titolo:||Nonlocality of two- and three-mode continuous variable systems|
|Parole Chiave:||nonlocality, Bell’s inequalities, quantum mechanics, quantum information|
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||2005|
|Digital Object Identifier (DOI):||10.1088/1464-4266/7/6/003|
|Appare nelle tipologie:||01 - Articolo su periodico|