Entanglement, BEC, and superfluid-like behavior of two-mode photon systems

被引:0
作者
F. de Pasquale
G. L. Giorgi
机构
[1] Università di Roma La Sapienza,Dipartimento di Fisica
[2] INFM Center for Statistical Mechanics and Complexity,undefined
来源
The European Physical Journal Special Topics | 2008年 / 160卷
关键词
Coherent State; European Physical Journal Special Topic; Quantum Phase Transition; Braunstein; Kerr Nonlinearity;
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学科分类号
摘要
A system of two interacting photon modes, without constraints on the photon number, in the presence of a Kerr nonlinearity, exhibits BEC if the transfer amplitude is greater than the mode frequency. A symmetry-breaking field (SBF) can be introduced by taking into account a classical electron current. The ground state, in the limit of small nonlinearity, becomes a squeezed state, and thus the modes become entangled. The smaller is the SBF, the greater is entanglement. Superfluid-like behavior is observed in the study of entanglement growth from an initial coherent state, since in the short-time range the growth does not depend on the SBF amplitude, and on the initial state amplitude. On the other hand, the latter is the only parameter which determines entanglement in the absence of the SBF.
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页码:139 / 145
页数:6
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