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Amplifying and freezing of quantum coherence using weak measurement and quantum measurement reversal |
Lian-Wu Yang(杨连武)1,2, Yun-Jie Xia(夏云杰)1 |
1 College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; 2 School of Physics, Shandong University, Jinan 250100, China |
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Abstract We analyze universal conditions where the l1 norm and relative entropy of coherence are amplified and frozen under identical bit-flip channels; that is, using pre-measurements (quantum weak measurements or quantum measurement reversals) on the systems before undergoing local bit-flip channels. With the option of quantum weak measurements or quantum measurement reversals, the measurement strength and the success probability are all determined by the initial state of the quantum system.
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Received: 26 April 2016
Revised: 21 July 2016
Accepted manuscript online:
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PACS:
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.67.Pp
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(Quantum error correction and other methods for protection against decoherence)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11204156, 61178012, 11304179, and 11247240) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20133705110001). |
Corresponding Authors:
Yun-Jie Xia
E-mail: yjxia@mail.qfnu.edu.cn
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Cite this article:
Lian-Wu Yang(杨连武), Yun-Jie Xia(夏云杰) Amplifying and freezing of quantum coherence using weak measurement and quantum measurement reversal 2016 Chin. Phys. B 25 110303
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