Abstract
Recently, the idea of semi-quantumness has been often used in designing quantum cryptographic schemes, which allows some of the participants of a quantum cryptographic scheme to remain classical. One of the reasons why this idea is popular is that it allows a quantum information processing task to be accomplished by using quantum resources as few as possible. In this paper, we extend the idea to quantum secure direct communication(QSDC) by proposing a semi-quantum secure direct communication scheme. In the scheme, the message sender, Alice, encodes each bit into a Bell state \(|\varphi ^{+}\rangle =\frac {1}{\sqrt 2}(|00\rangle +|11\rangle )\) or \(|{\Psi }^{+}\rangle =\frac {1}{\sqrt 2}(|01\rangle +|10\rangle )\), and the message receiver, Bob, who is classical in the sense that he can either let the qubit he received reflect undisturbed, or measure the qubit in the computational basis |0〉, |1〉 and then resend it in the state he found. Moreover, the security analysis of our scheme is also given.
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Acknowledgments
We are very grateful to the reviewers and the editors for their invaluable comments and detailed suggestions that helped to improve the quality of the present paper. This work is supported by the National Natural Science Foundation of China (Grant Nos. 61502179, 61472452 and 61772565), the Natural Science Foundation of Guangdong Province of China (No. 2017A030313378), the Science and Technology Program of Guangzhou City of China (No. 201707010194), the Fundamental Research Funds for the Central Universities (No. 17lgzd29).
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Xie, C., Li, L., Situ, H. et al. Semi-quantum Secure Direct Communication Scheme Based on Bell States. Int J Theor Phys 57, 1881–1887 (2018). https://doi.org/10.1007/s10773-018-3713-7
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DOI: https://doi.org/10.1007/s10773-018-3713-7