Bose-Einstein condensation with an entangled order parameter |
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Authors: | Shi Yu Niu Qian |
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Affiliation: | Department Physics, Fudan University, Shanghai 200433, China. yushi@fudan.edu.cn |
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Abstract: | We propose a practically accessible non-mean-field ground state of Bose-Einstein condensation, which occurs in an interspecies two-particle entangled state, and is thus described by an entangled order parameter. A suitably defined entanglement entropy is used as the characterization of the non-mean-field nature, and is found to persist in a wide parameter regime. The interspecies entanglement leads to novel interference terms in the dynamical equations governing the single-particle orbital wave function. Experimental feasibility and several methods of probe are discussed. We urge the study of multichannel scattering between different species of atoms. |
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