Creating quantum correlations through local nonunitary memoryless channels
Creating quantum correlations through local nonunitary memoryless channels
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DOI：
10.1103/physreva.85.010102
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发表时间：
2012-01-30
影响因子：
2.9
通讯作者：
Giovannetti, Vittorio
中科院分区：
文献类型：
--
作者：
Ciccarello, Francesco;Giovannetti, Vittorio
我们发现，在局域无记忆噪声的作用下，两个初始处于完全经典态的量子比特可以发展出显著的量子关联，这可以通过量子不和谐(QD)来测量(具体地说，我们考虑的是马尔可夫幅度衰减信道的情况)。在以紧凑的形式推导出这种过程中所涉及的一类可分离状态的量子点后，这一点得到了分析证明。我们在布洛赫球体中提供了一张图片，它毫不含糊地强调了这种效应背后的物理机制，而不考虑所采用的量子关联的具体测量。
We show that two qubits, initially in a fully classical state, can develop significant quantum correlations as measured by the quantum discord (QD) under the action of a local memoryless noise (specifically we consider the case of a Markovian amplitude-damping channel). This is analytically proven after deriving in a compact form the QD for the class of separable states involved in such a process. We provide a picture in the Bloch sphere that unambiguously highlights the physical mechanism behind the effect regardless of the specific measure of quantum correlations adopted.