Abstract
Quantum secure direct communication (QSDC) is a unique technique, which supports the secure transmission of confidential information directly through a quantum channel without the need for a secret key and for ciphertext. Hence this secure communication protocol fundamentally differs from its conventional counterparts. In this article, we report the first measurement-device-independent (MDI) QSDC protocol relying on sequences of entangled photon pairs and single photons. Explicitly, it eliminates the security loopholes associated with the measurement device. Additionally, this MDI technique is capable of doubling the communication distance of its conventional counterpart operating without using our MDI technique. We also conceive a protocol associated with linear optical Bell-basis measurements, where only two of the four Bell-basis states could be measured. When the number of qubits in a sequence reduces to 1, the MDI-QSDC protocol degenerates to a deterministic MDI quantum key distribution protocol.
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This work was supported by the National Basic Research Program of China (Grant Nos. 2017YFA0303700, and 2015CB921001), the National Natural Science Foundation of China (Grant Nos. 61726801, 11474168, 11974189, and 11474181). Lajos Hanzo would like to thank the European Research Council for the fiscal support of his Advanced Fellow Grant QuantCom. The helpful suggestions of Dr Chitra Shukla are also gratefully acknowledged.
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Zhou, Z., Sheng, Y., Niu, P. et al. Measurement-device-independent quantum secure direct communication. Sci. China Phys. Mech. Astron. 63, 230362 (2020). https://doi.org/10.1007/s11433-019-1450-8
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DOI: https://doi.org/10.1007/s11433-019-1450-8