https://doi.org/10.1140/epjst/e2008-00717-8
Entanglement, BEC, and superfluid-like behavior of two-mode photon systems
1
Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
2
INFM Center for Statistical Mechanics and Complexity, Piazzale A. Moro 2, 00185 Roma, Italy
Corresponding author: gianluca.giorgi@roma1.infn.it
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.
© EDP Sciences, Springer-Verlag, 2008
