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We propose a theoretical scheme to realize a sensitive amplification ofquantum discord (QD) between two atomic qubits via a cavity-Bose-Einsteincondensate (BEC) system which was used to firstly realize the Dicke quantumphase transition (QPT) [Nature 464, 1301 (2010)]. It is shown that theinfluence of the cavity-BEC system upon the two qubits is equivalent to a phasedecoherence environment. It is found that QPT in the cavity-BEC system is thephysical mechanism of the sensitive QD amplification.

Quantum discord amplification induced by quantum phase transition via a cavity-Bose-Einstein-condensate system