Freezing phenomena of quantum discord under phase damping: necessary and sufficient conditions

Details Freezing phenomena of quantum discord under phase damping: necessary and sufficient conditions Freezing phenomena of quantum discord under phase damping: necessary and sufficient conditions

2012-03-03

arxiv.org/abs/1203.0650v2

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

The freezing dynamics of quantum discord under phase damping noise processes is investigated. We derive the necessary and sufficient conditions of the phenomenon for standard Bell-diagonal states through elaborating the time variation of the discord in terms of the function of relative entropy. These conditions are also applicable to the phenomenon occurring in a non-Markovian dephasing process. Moreover, we show that the same phenomena and conditions coincide in a new sort of Bell-diagonal states beyond the standard form.

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