Physics – Quantum Physics
Scientific paper
2008-06-12
Phys. Rev. A 78, 042330 (2008)
Physics
Quantum Physics
Published version, 13 pages, 4 figures, minor changes, references added, acknowledgement added
Scientific paper
10.1103/PhysRevA.78.042330
Differential phase shift quantum key distribution systems have a high potential for achieving high speed key generation. However, its unconditional security proof is still missing, even though it has been proposed for many years. Here, we prove its security against collective attacks with a weak coherent light source in the noiseless case (i.e. no bit error). The only assumptions are that quantum theory is correct, the devices are perfect and trusted and the key size is infinite. Our proof works on threshold detectors. We compute the lower bound of the secret key generation rate using the information-theoretical security proof method. Our final result shows that the lower bound of the secret key generation rate per pulse is linearly proportional to the channel transmission probability if Bob's detection counts obey the binomial distribution.
Fung Chi-Hang Fred
Guo Guang-Can
Han Zheng-Fu
Zhao Yu-Bin
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