Quantum discord amplification induced by quantum phase transition via a cavity-Bose-Einstein-condensate system
arXiv:1208.2776 · doi:10.1103/PhysRevA.87.024101
Abstract
We propose a theoretical scheme to realize a sensitive amplification of quantum discord (QD) between two atomic qubits via a cavity-Bose-Einstein condensate (BEC) system which was used to firstly realize the Dicke quantum phase transition (QPT) [Nature 464, 1301 (2010)]. It is shown that the influence of the cavity-BEC system upon the two qubits is equivalent to a phase decoherence environment. It is found that QPT in the cavity-BEC system is the physical mechanism of the sensitive QD amplification.
5 pages, 3 figures
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