Abstract
A deterministic secret quantum communication (DSQC) protocol is proposed with four-qubit GHZ states. It has some outstanding advantages. Firstly, it has a high communication capacity as each four-qubit GHZ state can carry three bits of secret messages. Secondly, as all of the quantum resource is useful, the intrinsic efficiency of the communication approaches the maximum value 100%. Besides, its total efficiency of the present protocol is 60%, more higher than most of the current existing DSQC protocols. The decoy photon detection technique guarantees that Eve’s any eavesdropping behavior can be detected on site, and the three-step transmitting strategy ensures no information will be leaked in the communication process. Moreover, the present protocol is feasible with the present day technique.
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Acknowledgements
We thank professor Zhan-jun Zhang for some important discussions. This work is supported by the National Natural Science Foundation of China (Grant No. 61701002), the school-level key project of West Anhui University (Grant No. KJ103762015B23), and the Key Project of the Domestic Visiting and Studying for Outstanding Youth Cadre Teacher in Colleges and Universities of Anhui Province (Grant No. gxfxZD2016193).
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Yuan, H., Song, J., Liu, XY. et al. Deterministic Secure Four-qubit GHZ States Three-step Protocol for Quantum Communication. Int J Theor Phys 58, 3658–3666 (2019). https://doi.org/10.1007/s10773-019-04234-0
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DOI: https://doi.org/10.1007/s10773-019-04234-0