热库诱导的两比特量子纠缠与量子关联

对比研究了处于热库中的两量子比特的量子纠缠和量子关联随时间的演化。数值模拟的结果表明，尽管热库几乎总能诱导两量子比特的量子纠缠与量子关联，但二者的动力学演化并不完全相同。在与热库的相互作用中，两比特初始形成量子纠缠，随后纠缠逐渐消失，两比特形成纠缠以外的量子关联并得到维持。由此看出，相比于量子纠缠，量子关联对消相干的影响表现得更为稳健。

Abstract

The evolutions of quantum entanglement and correlations between two qubits in a heat bath are comparatively studied. Numerical simulation results show that, although a heat bath can almost always induce the quantum entanglement and correlations between the qubits, their dynamical evolutions are not identical. During the interaction with the bath, the qubits get quantum entangled, and then the entanglement disappears gradually, and the qubits get quantum correlated beyond entanglement which can be maintained. In this sense, the quantum correlations are more robust against decoherence in comparison with quantum entanglement.

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郑小兰, 张斌. 热库诱导的两比特量子纠缠与量子关联[J]. 光学学报, 2014, 34(1): 0127002. Zheng Xiaolan, Zhang Bin. Quantum Entanglement and Correlations between Two Qubits Induced by a Heat Bath[J]. Acta Optica Sinica, 2014, 34(1): 0127002.

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