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Quantum network dense coding via continuous-variable graph states

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Abstract

We present a dense coding network based on continuous-variable graph state along with its corresponding protocol. A scheme to distill bipartite entanglement between two arbitrary modes in a graph state is provided in order to realize the dense coding network. We also analyze the capacity of network dense coding and provide a method to calculate its maximum mutual information. As an application, we analyze the performance of dense coding in a square lattice graph state network. The result showed that the mutual information of the dense coding is not largely affected by the complexity of the network. We conclude that the performance of dense coding network is very optimistic.

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Acknowledgments

We thank Jun Zhang, Yujin Qian and Yadong Wu for helpful discussions. This work was supported by the National Natural Science Foundation of China (Grants No. 61102053), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, SMC Excellent Young Faculty program (2011) and and SJTU PRP (Grants No. T03013002).

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Authors and Affiliations

  1. State Key Lab of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai, 200240, China

    Jiahao Zhang & Guangqiang He

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  1. Jiahao Zhang
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  2. Guangqiang He
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Correspondence to Guangqiang He.

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Zhang, J., He, G. Quantum network dense coding via continuous-variable graph states. Quantum Inf Process 13, 2437–2450 (2014). https://doi.org/10.1007/s11128-014-0793-z

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  • DOI: https://doi.org/10.1007/s11128-014-0793-z

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