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Information Leakage in Quantum Secret Sharing of Multi-Bits by an Entangled Six-Qubit State

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Abstract

In a recent paper Long et al. (J. Phys. A: Math. Theor. 45: 195303, 2012), a quantum secret sharing protocol was presented, in which the genuinely maximally entangled six-qubit states were used. According to the protocol, Alice could share three bits among three agents, which showed that it was more efficient than previous protocols. Here, we analyze it and point out that the information about the transmitted secret will be partly leaked out unknowingly. Through the classical public channel, 2/3 of Alice’s secret messages is leaked out to Bob1 and Bob2, and 1/3 secret messages is leaked out to Bob3, respectively. This phenomenon should be strictly forbidden in a quantum secret sharing protocol.

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Acknowledgments

This work is supported by NSFC (Grant Nos. 61272057, 61202434, 61170270, 61100203, 61003286, 61121061), NCET (Grant No. NCET-10-0260), Beijing Natural Science Foundation (Grant Nos. 4112040, 4122054), the Fundamental Research Funds for the Central Universities (Grant No. 2012RC0612, 2011YB01).

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Authors and Affiliations

  1. State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Su-Juan Qin & Feng Liu

  2. State Key Laboratory of Integrated Services Network, Xidian University, Xi’an, 710071, China

    Su-Juan Qin

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  1. Su-Juan Qin
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  2. Feng Liu
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Correspondence to Su-Juan Qin.

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Qin, SJ., Liu, F. Information Leakage in Quantum Secret Sharing of Multi-Bits by an Entangled Six-Qubit State. Int J Theor Phys 53, 3116–3123 (2014). https://doi.org/10.1007/s10773-014-2108-7

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  • DOI: https://doi.org/10.1007/s10773-014-2108-7

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