“Plug and play” quantum key distribution system with differential phase shift

Chunyuan Zhou; Guang Wu; Xiuliang Chen; Heping Zeng
September 2003
Applied Physics Letters;9/1/2003, Vol. 83 Issue 9, p1692
Academic Journal
We propose a “plug and play” scheme for the long-distance fiber-based cryptosystem based on the differential phase shift quantum key distribution, where any birefringence effects and polarization-dependent losses in the transmission fiber are automatically compensated by using a Faraday mirror. This system not only has stable performance but also creates keys 8/3 times more efficiently than the conventional cryptosystem based on the BB84 protocol. © 2003 American Institute of Physics.


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