Decoy-state quantum key distribution with biased basis choice.
We propose a quantum key distribution scheme that combines a biased basis choice with the decoy-state method. In this scheme, Alice sends all signal states in the Z basis and decoy states in the X and Z basis with certain probabilities, and Bob measures received pulses with optimal basis choice. This scheme simplifies the system and reduces the random number consumption. From the simulation result taking into account of statistical fluctuations, we find that in a typical experimental setup, the proposed scheme can increase the key rate by at least 45% comparing to the standard decoy-state scheme. In the postprocessing, we also apply a rigorous method to upper bound the phase error rate of the single-photon components of signal states.
1] Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing, P. R. China [2] State Key Laboratory of Mathematical Engineering and Advanced Computing, Zhengzhou, Henan, China.
Zhengchao
Z
Wei
Weilong
W
Wang
Zhen
Z
Zhang
Ming
M
Gao
Zhi
Z
Ma
Xiongfeng
X
Ma
D016494:Computer Security; D003198:Computer Simulation; D015233:Models, Statistical; D011789:Quantum Theory; D012815:Signal Processing, Computer-Assisted