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Chin. Phys. B, 2016, Vol. 25(8): 080310    DOI: 10.1088/1674-1056/25/8/080310
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Decoherence suppression for three-qubit W-like state using weak measurement and iteration method

Guang Yang(杨光), Bao-Wang Lian(廉保旺), Min Nie(聂敏)
Department of Communication Engineering, School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
Abstract  Multi-qubit entanglement states are the key resources for various multipartite quantum communication tasks. For a class of generalized three-qubit quantum entanglement, W-like state, we demonstrate that the weak measurement and the reversal measurement are capable of suppressing the amplitude damping decoherence by reducing the initial damping factor into a smaller equivalent damping factor. Furthermore, we propose an iteration method in the weak measurement and the reversal measurement to enhance the success probability of the total measurements. Finally, we discuss how the number of the iterations influences the overall effect of decoherence suppression, and find that the “half iteration” method is a better option that has more practical value.
Keywords:  quantum decoherence      W-like state      amplitude damping      weak measurement     
Received:  18 March 2016      Published:  05 August 2016
PACS:  03.67.Pp (Quantum error correction and other methods for protection against decoherence)  
  03.65.Yz (Decoherence; open systems; quantum statistical methods)  
  03.67.Hk (Quantum communication)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61172071), the International Scientific Cooperation Program of Shaanxi Province, China (Grant No. 2015KW-013), and the Scientific Research Program Funded by Shaanxi Provincial Education Department, China (Grant No. 16JK1711).
Corresponding Authors:  Guang Yang     E-mail:  sharon.yg@163.com

Cite this article: 

Guang Yang(杨光), Bao-Wang Lian(廉保旺), Min Nie(聂敏) Decoherence suppression for three-qubit W-like state using weak measurement and iteration method 2016 Chin. Phys. B 25 080310

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