no code implementations • 9 Apr 2013 • Yan-Lin Tang, Hua-Lei Yin, Xiongfeng Ma, Chi-Hang Fred Fung, Yang Liu, Hai-Lin Yong, Teng-Yun Chen, Cheng-Zhi Peng, Zeng-Bing Chen, Jian-Wei Pan
Specifically, by implementing a linear-optics unambiguous-state-discrimination measurement, we show that the security of a system without phase randomization --- which is a step assumed in conventional security analyses but sometimes neglected in practice --- can be compromised.
Quantum Physics
no code implementations • 3 Oct 2005 • Chi-Hang Fred Fung, Kiyoshi Tamaki, Hoi-Kwong Lo
In the first part of the paper, we show that SARG04 with two-way communications can tolerate a higher bit error rate (19. 4% for a one-photon source and 6. 56% for a two-photon source) than SARG04 with one-way communications (10. 95% for a one-photon source and 2. 71% for a two-photon source).
Quantum Physics
