Two-step quantum secure direct communication scheme with frequency coding |
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| Affiliation: | 1.Department of Physics, Tsinghua University, Beijing 100084, China;2.School of Science, Qingdao University of Technology, Qingdao 266000, China |
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| Abstract: | 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 precursory event. Here we propose a QSDC scheme by applying the frequency coding technique to the two-step QSDC protocol, which enables the two-step QSDC protocol to work in a noisy environment. We have numerically simulated the performance of the protocol in a noisy channel, and the results show that the scheme is indeed robust against channel noise and loss. We also give an estimate of the channel noise upper bound. |
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| Keywords: | quantum cryptography quantum secure direct communication frequency coding |
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