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Paper detail

When quantum channel preserves product states

Product states are always considered as the states that don't contain quantum correlation. We discuss here when a quantum channel sends the product states to themselves. The exact forms of such channels are proposed. It is shown that such a quantum channel is a local quantum channel, a composition of a local quantum channel and a flip operation, or such that one of the local states is fixed. Both finite- and infinite-dimensional systems are considered.

preprint2014arXivOpen access
Yu GuoZhaofang BaiShuanping DuXiulan Li
math-phmath.MPquant-ph
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Yu GuoZhaofang BaiShuanping DuXiulan Li

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