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Efficient Entanglement Concentration Schemes for Separated Nitrogen-Vacancy Centers Coupled to Low-Q Microresonators

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Abstract

We present several efficient entanglement concentration protocols (ECPs) with the nitrogen-vacancy (N-V) centers coupled to low-Q microresonators. Based on the input-output process of ancillary coherent light pulse in low-Q microresonators, we can obtain the maximally entangled states among remote participants via local operations and classical communication. Our protocols use a conventional photon detector to discriminate the two coherent states |α〉 and |−α〉, which is more convenient than homodyne measurement. We discuss the feasibility of our protocols, and they may be beneficial for quantum repeaters and quantum information processing.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China under Grant Nos. 61068001 and 11264042; China Postdoctoral Science Foundation under Grant No. 2012M520612; the Program for Chun Miao Excellent Talents of Jilin Provincial Department of Education under Grant No. 201316; and the Talent Program of Yanbian University of China under Grant No. 950010001.

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Authors and Affiliations

  1. Department of Physics, College of Science, Yanbian University, Yanji, Jilin, 133002, People’s Republic of China

    Bin Si, Hong-Fu Wang & Shou Zhang

  2. Department of Physics, College of Natural Science, Chungbuk National University, Cheongju, Chungbuk, 361-763, South Korea

    Jing-Ji Wen & Kyu-Hwang Yeon

  3. Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, People’s Republic of China

    Liu-Yong Cheng

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  1. Bin Si
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  2. Jing-Ji Wen
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  3. Liu-Yong Cheng
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  4. Hong-Fu Wang
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  5. Shou Zhang
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  6. Kyu-Hwang Yeon
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Correspondence to Shou Zhang.

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Si, B., Wen, JJ., Cheng, LY. et al. Efficient Entanglement Concentration Schemes for Separated Nitrogen-Vacancy Centers Coupled to Low-Q Microresonators. Int J Theor Phys 53, 80–90 (2014). https://doi.org/10.1007/s10773-013-1785-y

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