Amplification of quantum discord between two uncoupled qubits in a common environment by phase decoherence

Amplification of quantum discord between two uncoupled qubits in a common environment by phase decoherence
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通过相位退相干放大公共环境中两个未耦合量子位之间的量子不一致

DOI:
10.1088/0953-4075/43/16/165503
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发表时间:
2010-05
期刊:
J. Phys. B: At. Mol. Opt. Phys.
影响因子:
--
通讯作者:
Jie-Qiao Liao
Jie-Qiao Liao
中科院分区:
其他
文献类型:
--
作者:
Ji-Bing Yuan;Le-Man Kuang;Jie-Qiao Liao

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我们分析研究了由两个非耦合量子比特之间的量子不和谐测量的量子关联的动力学行为,它们沉浸在一个共同的欧姆环境中。我们发现,在时间演化过程中,对于某些初始制备的X-型态,两个非相互作用量子比特的量子不和谐可以被极大地放大或保护。特别地,我们发现对于两个相同量子比特的情况,存在量子不和谐的稳定放大,并且对于两个具有大失谐的不同量子比特的情况,量子不和谐可以被保护。研究还表明,一般情况下,在临界时刻tc,时间演化过程中量子失谐发生突变,对于某些X型态,失谐放大和保护可能只发生在该时间间隔内.这为量子关联的产生和保护提供了新的思路。
We study analytically the dynamic behaviours of quantum correlation measured by a quantum discord between two uncoupled qubits, which are immersed in a common Ohmic environment. We show that the quantum discord of the two non-interacting qubits can be greatly amplified or protected for certain initially prepared X-type states in the time evolution. In particular, it is found that stable amplification of the quantum discord exists for the case of two identical qubits, and the quantum discord can be protected for the case of two different qubits with a large detuning. It is also indicated that in general a sudden change of the quantum discord occurs in the time evolution at a critical time point tc, and the discord amplification and protection may occur only in the time interval for certain X-type states. This sheds new light on the creation and protection of quantum correlation.
DOI: --
发表时间: 1998-03
期刊: Dictionary of Geotourism
影响因子: --
作者:
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