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Science China Physics Mechanics and Astronomy

Quantum secure direct communication with entanglement source and single-photon measurement

Lu Yang, Jiawei Wu, Zaisheng Lin, Liuguo Yin, GuiLu Long

Published Aug 25, 2020• 48 citations
Publisher
DOI
10.1007/s11433-020-1576-y

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Quantum communication is a technology that trans-mits quantum states. Quantum secure direct communication is a promising application because unlike Quantum key distribution, a message can be transmitted directly through a quantum channel. The secrecy capacity of the QSDC protocol can be estimated using the decoy state. However, the secrecy capacity of the practical QSDC protocol is lowered due to the finite-size effect. In this study, we introduce QSDC protocol with an entanglement source and single-photon measurement and we analyze the secrecy capacity considering statistical fluctuation.
Quantum secure direct communication (QSDC) is a quantum communication paradigm that transmits confidential messages directly using quantum states. Measurement-device-independent (MDI) QSDC protocols can eliminate the security loopholes associated with measurement devices. To enhance the practicality and performance of MDI-QSDC protocols, we propose a one-photon-interference MDI QSDC (OPI-QSDC) protocol which transcends the need for quantum memory, ideal single-photon sources, or entangled light sources. The security of our OPI-QSDC protocol has also been analyzed using quantum wiretap channel theory. Furthermore, our protocol could double the distance of usual prepare-and-measure protocols, since quantum states sending from adjacent nodes are connected with single-photon interference, which demonstrates its potential to extend the communication distance for point-to-point QSDC.