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A universal coherent source for quantum key distribution. Chinese sci Bullt
Chinese Science Bulletin
? 2009 SCIENCE IN CHINA PRESS
Springer
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Citation: Zhang S L, Zou X B, Li C F, et al. A universal coherent source for quantum key distribution. Chinese Sci Bull, 2009, 54: 1863-1871, doi: 10.1007/s11434-
009-0330-0
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A universal coherent source for quantum key
distribution
ZHANG ShengLi1,2, ZOU XuBo1?, LI ChuanFeng1, JIN ChenHui2 GUO GuangCan1
1 Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
2 Electronic Technology Institute, Information Engineer University, Zhengzhou 450004, China
We propose a concept of universal coherent source for quantum key distribution. The weak coherent
pulse (WCP) and heralded single photon source (HSPS) are the most common photon sources for
state-of-art quantum key distribution (QKD). However, there exists a prominent crossover between the
maximal secure distance and the secure key generating rate in short and middle distance if one applies
these two sources in a practical decoy state quantum key distribution. It is shown that by combining
the heralded pair coherent state (HPCS) photon source and the practical decoy state method together,
one can not only strengthen the maximal secure transmission distance, but also improve key generat-
ing rate at short and medium distance. Moreover, the advancement in key generating is not confined in
the particular protocol utilized and can be easily checked for both BB84 and SARG protocol. Finally, we
clearly demonstrate how the HPCS-based decoy method works effectively and feasibly by proposing an
efficient HPCS-based “1 signal+2 decoy” state method.
quantum key distribution, decoy states, pair coherent state, key generation rate
Quantum key distribution (QKD)[1,2] is a powerful tool
which allows two remote partners, Alice and Bob, to
establish random and private keys with an unconditional
security. However, th
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