Environment-assisted quantum state restoration via weak measurements
Environment-assisted quantum state restoration via weak measurements
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DOI：
10.1103/physreva.89.042320
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发表时间：
2014-04
影响因子：
2.9
通讯作者：
Kelvin Wang;Xinyu Zhao;Ting Yu
中科院分区：
文献类型：
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作者：
Kelvin Wang;Xinyu Zhao;Ting Yu
本文基于环境辅助纠错（EAEC）方案提出了一种新的量子态恢复方案。通过引入弱测量反转（WMR）操作，我们将展示如何在不调用已知在许多重要物理系统中不存在的随机酉分解的情况下恢复量子开放系统的初始状态。我们说明了我们的新方案，并将其与在耗散通道情况下纯粹基于 WMR 操作的方案进行比较。在所提出的新方案中，当考虑到从环境测量获得的信息时，可以显着提高恢复未知初始状态的成功概率。此外，我们表明我们提出的方案的适用范围比 EAEC 方案更广泛。最后，讨论了可能的 Kraus 分解的成功概率的优化。
In this paper, a new quantum state restoration scheme is proposed based on the environment-assisted error correction (EAEC) scheme. By introducing a weak measurement reversal (WMR) operation, we shall show how to recover an initial state of a quantum open system without invoking random unitary decompositions which are known to be absent in many important physical systems. We illustrate our new scheme and compare it with a scheme purely based on the WMR operation in the case of dissipative channel. In the proposed new scheme, the successful probability of recovering an unknown initial state can be significantly improved when the information obtained from an environment measurement is taken into account. Moreover, we show that the applicable range of our proposed scheme is wider than the EAEC scheme. Finally, the optimization of the successful probability for possible Kraus decompositions is discussed.