Open AccessContinuous-variable three-color tripartite entangled state generated by a non-degenerate optical parameter oscillator
Author(s) -
Zhihui Yan,
Xiaojun Jia,
Changde Xie,
Kunchi Peng
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.014206
Subject(s) - multipartite , optical parametric oscillator , quantum entanglement , physics , degenerate energy levels , w state , quantum mechanics , multipartite entanglement , continuous variable , quantum , state (computer science) , squashed entanglement , mathematics , laser , statistics , algorithm
The quantum correlations between the output signal, the output idler and the reflected pump fields generated by non-degenerate optical parametric oscillator operating above the oscillation threshold are theoretically calculated with the semi-classical formulae. According to the multipartite entanglement criteria for the continuous variables, proposed by P. van Loock and A. Furusawa, the calculated results prove the existence of the quantum correlations between the amplitude and the phase quadrature for the three optical fields, i. e. they form a tripartite entangled state. We numerically calculate the dependence of the entanglement on the physical parameters of the optical oscillator and find the optimum operating conditions of the oscillator to produce the three-color tripartite entangled state, which provide the direct references for the design of the continuous variable multipartite entanglement generation systems.