Vanishing quantum discord is not necessary for completely positive maps
Vanishing quantum discord is not necessary for completely positive maps
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DOI：
10.1103/physreva.87.042301
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发表时间：
2013-04-01
影响因子：
2.9
通讯作者：
Rodriguez-Rosario, Cesar A.
中科院分区：
文献类型：
--
作者：
Brodutch, Aharon;Datta, Animesh;Rodriguez-Rosario, Cesar A.
对可能与其环境相关的系统动态的描述，只有在特定框架的背景下才有意义。不同的框架依赖于对初始系统环境状态的不同假设。我们重新审视完全积极性和量子不和谐之间的联系，在两个不同的假设有关的家庭的初始状态。我们提出了一个例子，一个系统的环境状态与非零量子不和谐，导致一个完全积极的地图。这就否定了早先关于完全正映射的量子不和谐必然消失的主张。在最后的评论中，我们讨论了每种方法的物理有效性。DOI：10.1103/PhysRevA.87.042301
The description of the dynamics of a system that may be correlated with its environment is only meaningful within the context of a specific framework. Different frameworks rely upon different assumptions about the initial system-environment state. We reexamine the connections between complete positivity and quantum discord within two different sets of assumptions about the relevant family of initial states. We present an example of a system-environment state with nonvanishing quantum discord that leads to a completely positive map. This invalidates an earlier claim about the necessity of vanishing quantum discord for completely positive maps. In our final remarks, we discuss the physical validity of each approach. DOI: 10.1103/PhysRevA.87.042301