Measurement-device-independent quantum key distribution(MDI-QKD)protocol can remove all the loopholes of the detection devices and,thus,has attracted much attention.Based on the technique of single-photon interference...Measurement-device-independent quantum key distribution(MDI-QKD)protocol can remove all the loopholes of the detection devices and,thus,has attracted much attention.Based on the technique of single-photon interference,we propose a modified MDI-QKD protocol with phase post-selection.We prove the security of the announcement of the private phases in the X basis and show how to apply the phase post-selection method to the double-scanning four-intensity MDI-QKD protocol.The numerical results show that the phase postselection method can significantly improve the key rates at all distances.In the double-scanning method,two parameters need to be scanned in the calculation of the final key rate,and the global parameter optimization is pretty time-consuming.We propose an accelerated method that can greatly reduce the running time of the global parameter optimization program.This makes the method practically useful in an unstable channel.展开更多
基金Ministry of Science and Technology of China through the National Key Research and Development Program of China(2020YFA0309701)National Natural Science Foundation of China(12104184,12174215,11974204,12147107)+3 种基金Shandong Provincial Natural Science Foundation(ZR2021LLZ007)Key R&D Plan of Shandong Province(2021ZDPT01)Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics(KF202110)Leading Talents of Quancheng Industry。
文摘Measurement-device-independent quantum key distribution(MDI-QKD)protocol can remove all the loopholes of the detection devices and,thus,has attracted much attention.Based on the technique of single-photon interference,we propose a modified MDI-QKD protocol with phase post-selection.We prove the security of the announcement of the private phases in the X basis and show how to apply the phase post-selection method to the double-scanning four-intensity MDI-QKD protocol.The numerical results show that the phase postselection method can significantly improve the key rates at all distances.In the double-scanning method,two parameters need to be scanned in the calculation of the final key rate,and the global parameter optimization is pretty time-consuming.We propose an accelerated method that can greatly reduce the running time of the global parameter optimization program.This makes the method practically useful in an unstable channel.
