Quantum-discord amplification induced by a quantum phase transition via a cavity–Bose-Einstein-condensate system
Quantum-discord amplification induced by a quantum phase transition via a cavity–Bose-Einstein-condensate system
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DOI：
10.1103/physreva.87.024101
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发表时间：
2012-08
影响因子：
2.9
通讯作者：
Ji-Bing Yuan;L. Kuang
中科院分区：
文献类型：
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作者：
Ji-Bing Yuan;L. Kuang
我们提出了一种通过腔-玻色-爱因斯坦凝聚体（BEC）系统实现两个原子量子比特之间的量子不和谐（QD）的灵敏放大的理论方案，该BEC系统用于首次实现迪凯量子相变（QPT）[Nature 464，1301（2010）]。结果表明，腔-BEC系统对两个量子比特的影响等价于相位退相干环境。发现腔-BEC系统中的QPT是量子点灵敏放大的物理机制。
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.