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Practical decoy-state BB84 quantum key distribution with quantum memory |
| Xian-Ke Li(李咸柯)1,2,3, Xiao-Qian Song(宋小谦)1,2,3, Qi-Wei Guo(郭其伟)1, Xing-Yu Zhou(周星宇)1,2,3, and Qin Wang(王琴)1,2,3,† |
1 Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
2 Broadband Wireless Communication and Sensor Network Technology, Key Laboratory of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
3 Telecommunication and Networks National Engineering Research Center, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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Abstract We generalize BB84 quantum key distribution (QKD) to the scenario where the receiver adopts a heralded quantum memory (QM). With the heralded QM, the valid dark count rate of the receiver's single photon detectors can be mitigated obviously, which will lower the quantum bit error rate, and thus improve the performance of decoy-state BB84 QKD systems in long distance range. Simulation results show that, with practical experimental system parameters, decoy-state BB84 QKD with QM can exhibit performance comparable to that of without QM in short distance range, and exhibit performance better than that without QM in long distance range.
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Received: 14 October 2020
Revised: 31 December 2020
Accepted manuscript online: 11 January 2021
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PACS:
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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42.65.Lm
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(Parametric down conversion and production of entangled photons)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0306400 and 2017YFA0304100), the National Natural Science Foundation of China (Grant Nos. 12074194 and 11774180), and the Leading-edge Technology Program of Jiangsu Provincial Natural Science Foundation, China (Grant No. BK20192001). |
Corresponding Authors:
Qin Wang
E-mail: qinw@njupt.edu.cn
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Cite this article:
Xian-Ke Li(李咸柯), Xiao-Qian Song(宋小谦), Qi-Wei Guo(郭其伟), Xing-Yu Zhou(周星宇), and Qin Wang(王琴) Practical decoy-state BB84 quantum key distribution with quantum memory 2021 Chin. Phys. B 30 060305
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