3 November 2016 Quantum secure direct communication with frequency coding scheme
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Quantum secure direct communication (QSDC) is an important branch of quantum cryptography. It can transmit secret information directly without establishing a key first, unlike quantum key distribution which requires this precursive event. One of the most highlighted QSDC protocol is the Two-step protocol. This paper will focus on proposing a frequency coding scheme in the Two-step protocol, while retaining other contents of the QSDC protocol. This new coding scheme will significantly increase the protocol’s ability against channel noise and loss, and provides an efficient protocol for secure direct quantum communication in a noisy environment. Besides, the frequency coding technology is also easy to understand and highly practical. After numerically simulating the performance of the protocol in a noisy channel, the results showed that the scheme was robust against channel noise and loss.
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Xue-Liang Zhao, Xue-Liang Zhao, Dong Ruan, Dong Ruan, } "Quantum secure direct communication with frequency coding scheme", Proc. SPIE 10029, Quantum and Nonlinear Optics IV, 1002914 (3 November 2016); doi: 10.1117/12.2245859; https://doi.org/10.1117/12.2245859


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