Super Quantum Discord for X-type States
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- 作者：Tao Li ; Teng Ma ; Yaokun Wang ; Shaoming Fei…
- 关键词：Weak measurement ; Super quantum discord ; Quantum correlations ; X ; type state
- 刊名：International Journal of Theoretical Physics
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：54
- 期：2
- 页码：680-688
- 全文大小：534 KB
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- 刊物主题：Physics
Physics
Quantum Physics
Elementary Particles and Quantum Field Theory
Mathematical and Computational Physics- 出版者：Springer Netherlands
- ISSN：1572-9575
文摘
Weak measurement is a new way to manipulate and control quantum systems. Different from projection measurement, weak measurement only makes a small change in status. Applying weak measurement to quantum discord, Singh and Pati proposed a new kind of quantum correlations called “super quantum discord (SQD)-[Ann. Phys. 343,141(2014)].Unfortunately, the super quantum discord is also difficult to calculate. There are only few explicit formulae about SQD. We derive an analytical formula of SQD for general X-type two-qubit states, which surpass the conclusion for Werner states and Bell diagonal states. Furthermore, our results reveal more knowledge about the new insight of quantum correlation and give a new way to compare SQD with normal quantum discord. Finally, we analyze its dynamics under nondissipative channels.