Sudden death and revival of Gaussian Einstein-Podolsky-Rosen steering in noisy channels
Sudden death and revival of Gaussian Einstein-Podolsky-Rosen steering in noisy channels
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高斯爱因斯坦—波多尔斯基—罗森在嘈杂的通道中突然死亡和复活
DOI：
10.1038/s41534-021-00399-x
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发表时间：
2021-04-27
影响因子：
7.6
通讯作者：
Peng, Kunchi
中科院分区：
文献类型：
--
作者：
Deng, Xiaowei;Liu, Yang;Peng, Kunchi
Einstein-Podolsky-Rosen(EPR)转向是安全量子信息任务的有用资源。研究量子信道中不可避免的损耗和噪声对EPR转向的影响是至关重要的。通过有耗信道和有噪信道分布双模压缩态，分析和实验证明了量子态纯度和过量噪声对高斯EPR导引的影响。我们证明了态杂质不会导致高斯EPR导引的猝死，但量子信道中的噪声会导致猝死。然后，我们通过建立相关噪声信道来恢复消失的高斯EPR导向。与纠缠不同，高斯型EPR转向的猝死和复苏具有方向性。我们的结果证实了Reid和I.Kogias等人提出的EPR转向准则。在我们的情况下是等同的。这些结果为在噪声环境下利用高斯EPR导引进行非对称量子信息处理奠定了基础。
Einstein-Podolsky-Rosen (EPR) steering is a useful resource for secure quantum information tasks. It is crucial to investigate the effect of inevitable loss and noise in quantum channels on EPR steering. We analyze and experimentally demonstrate the influence of purity of quantum states and excess noise on Gaussian EPR steering by distributing a two-mode squeezed state through lossy and noisy channels, respectively. We show that the impurity of state never leads to sudden death of Gaussian EPR steering, but the noise in quantum channel can. Then we revive the disappeared Gaussian EPR steering by establishing a correlated noisy channel. Different from entanglement, the sudden death and revival of Gaussian EPR steering are directional. Our result confirms that EPR steering criteria proposed by Reid and I. Kogias et al. are equivalent in our case. The presented results pave way for asymmetric quantum information processing exploiting Gaussian EPR steering in noisy environment.