Frozen Quantum Coherence
Frozen Quantum Coherence
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DOI：
10.1103/physrevlett.114.210401
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发表时间：
2015-05-27
影响因子：
8.6
通讯作者：
Adesso, Gerardo
中科院分区：
文献类型：
--
作者：
Bromley, Thomas R.;Cianciaruso, Marco;Adesso, Gerardo
我们分析了在什么样的动力学条件下开放量子系统的相干性完全不受噪声的影响。对于单个量子比特，发现特定的相干性测量在不同的条件下冻结，它们之间没有普遍的一致性。相反，对于偶数N的N量子比特系统，我们确定了初始状态和局部非相干通道的普适条件，使得所有真正的基于距离的相干单调在整个演化过程中保持不变。这一发现也为纠缠之外的量子关联的冻结现象提供了一个有见地的物理解释。我们进一步得到了基于距离的措施的相干性在两个量子比特状态的最大混合边缘的分析结果。
We analyze under which dynamical conditions the coherence of an open quantum system is totally unaffected by noise. For a single qubit, specific measures of coherence are found to freeze under different conditions, with no general agreement between them. Conversely, for an N-qubit system with even N, we identify universal conditions in terms of initial states and local incoherent channels such that all bona fide distance-based coherence monotones are left invariant during the entire evolution. This finding also provides an insightful physical interpretation for the freezing phenomenon of quantum correlations beyond entanglement. We further obtain analytical results for distance-based measures of coherence in two-qubit states with maximally mixed marginals.