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

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

References in corpus (4)

• Quantum discord and the power of one qubit
• Experimental quantum computing without entanglement
• Optimal measurements to access classical correlations of two-qubit states
• Detection of quantum critical points by a probe qubit