1202.5422 (Shi-Biao Zheng)

Dicke-like quantum phase transition and vacuum entanglement with two
coupled atomic ensembles    [PDF]

Shi-Biao Zheng

We study the coherent cooperative phenomena of the system composed of two
interacting atomic ensembles in the thermodynamic limit. Remarkably, the system
exhibits the Dicke-like quantum phase transition and entanglement behavior
although the governing Hamiltonian is fundamentally different from the
spin-boson Dicke Hamiltonian, offering the opportunity for investigating
collective matter-light dynamics with pure matter waves. The model can be
realized with two Bose-Einstein condensates or atomic ensembles trapped in two
optical cavities coupled to each other. The interaction between the two
separate samples is induced by virtual photon exchange.

View original: http://arxiv.org/abs/1202.5422