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arXiv quant-ph/0503116quant-ph
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退相干条件下的纠缠演化

Entanglement Evolution in the Presence of Decoherence

Jin Wang, Herman Batelaan, Jeremy Podany, Anthony F. Starace

摘要:

研究了两个量子比特的纠缠,每个量子比特被定义为一个有效的两能级自旋1/2系统,量子比特通过海森堡XY相互作用相互作用,并且由于布居弛豫和热效应而受到退相干的影响.在零温度条件下,对几种典型的初态,包括可分初态(非纠缠初态),用解析和数值方法研究了纠缠度随时间的变化。对于任意初始状态,得到了非零稳态并发度的解析表达式,并给出了使稳态并发度最大化的最优参数值。稳态并发分析发现保持非零低,有限的温度。我们还确定的贡献的全球和本地的相干性的稳态纠缠。

英文摘要:

The entanglement of two qubits, each defined as an effective two-level, spin 1/2 system, is investigated for the case that the qubits interact via a Heisenberg XY interaction and are subject to decoherence due to population relaxation and thermal effects. For zero temperature, the time dependent concurrence is studied analytically and numerically for some typical initial states, including a separable (unentangled) initial state. An analytical formula for non-zero steady state concurrence is found for any initial state, and optimal parameter values for maximizing steady state concurrence are given. The steady state concurrence is found analytically to remain non-zero for low, finite temperatures. We also identify the contributions of global and local coherence to the steady state entanglement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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