Coherence of Bose condensates

Anatoly N. Oraevsky

The condition for a stimulated formation of a coherent Bose- condensate of the Bose-particles is studied. The recently published experimental observation of the Bose-condensate interference, and the idea of an 'atom laser' generating the coherent atomic states are discussed. The Gross-Pitaevsky equations are generalized, where the interaction of Bose- condensate with incoherent subsystems of the particles is taken into account.

M. Fannes, Jv Pule, André F. Verbeure

Vyacheslav I. Yukalov, Elizaveta P. Yukalova, Vanderlei Salvador Bagnato

Coherent resonance is the effect of resonant excitation of nonlinear coherent modes in trapped Bose condensates. This novel effect is shown to be feasible for Bose-condensed trapped gases. Conditions for realizing this effect are derived. A method of stabilizing Bose condensates with attractive interactions is advanced. The origin of dynamic critical phenomena is elucidated. Interference effects are studied. The existence of atomic squeezing and multiparticle coherent entanglement is demonstrated. Coherent resonance is a generalization of atomic resonance, involving internal states of an individual atom, to collective states of a multiparticle system.

Yutaka Kano

The properties of the coherent state appearing in the Bose-Einstein condensation of an ideal Bose gas are discussed. The thermodynamic functions in the presence of such a coherent state are obtained. The density correlation function is derived. It is shown that the density correlation function reduces to the London-Placzek formula as temperature rises above the critical temperature of the Bose-Einstein condensation.

Joseph H. Thywissen, Fabrice Gerbier, S. Richard +3 more