Protecting Distribution Entanglement by Weak Measurement and Reversal under Various Decoherence Sources

Protecting Distribution Entanglement by Weak Measurement and Reversal under Various Decoherence Sources
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在各种退相干源下通过弱测量和反转来保护分布纠缠

DOI:
10.1088/0253-6102/61/4/10
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发表时间:
2014-04
影响因子:
3.1
通讯作者:
YAO Chun-Mei
YAO Chun-Mei
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wang Qiong;YAO Chun-Mei

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在量子信息处理中,保护纠缠不受环境扰动是一项重要的任务。我们研究了弱测量和反转(WMR)操作在保护分布式纠缠免受各种退相干源影响方面的有效性和局限性。由于任意纠缠的两体纯态在三种典型的噪声量子信道下的纠缠变化可以解析地研究,我们明确地表明,WMR操作确实有助于保护分布纠缠不受振幅阻尼和相位阻尼的影响,但对去极化没有帮助.使用目前的实验室技术测试我们的结果的实验可行性进行了讨论。
Protection of entanglement from disturbance of the environment is an essential task in quantum information processing. We examine the validity and limitation of the weak measurement and reversal (WMR) operation in the protection of distributed entanglement from various decoherence sources. Since the entanglement variation can be investigated analytically for an arbitrarily entangled bipartite pure state under three kinds of typical noisy quantum channels, we show explicitly that the WMR operation indeed helps for protecting distributed entanglement from amplitude damping and phase damping, but not for depolarizing. Experimental feasibility for testing our results is discussed using current laboratory techniques.
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