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Quantum Discord-Breaking Channels |
| YAO Chun-Mei1**, HE Zhi1, CHEN Zhi-Hua2, NIE Jian-Jun1 |
1College of Physics and Electronics, Hunan University of Arts and Science, Changde 415000
2Department of Science, Zhijiang College, Zhejiang University of Technology, Hangzhou 310024
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| Cite this article: |
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YAO Chun-Mei, HE Zhi, CHEN Zhi-Hua et al 2013 Chin. Phys. Lett. 30 090302 |
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Abstract Through comparisons with an entanglement breaking (EB) channel, we characterize the local quantum channels that destroy quantum correlations, especially for quantum discord, and give a detailed description of a discord-breaking (DB) channel. We prove that the quantum discord can be broken if and only if the local quantum channel is a commutativity-creating (CoC) channel. Then we show which kind of channels is a CoC channel, and address the relation between EB and DB channels. Furthermore we apply our results to three typical noise channels.
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Received: 22 May 2013
Published: 21 November 2013
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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03.65.Db
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(Functional analytical methods)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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