Stable differential phase shift quantum key distribution with a key creation efficiency of 3/4

Chen, Xiuliang; Zhou, Chunyuan; Wu, Guang; Zeng, Heping
April 2004
Applied Physics Letters;4/5/2004, Vol. 84 Issue 14, p2691
Academic Journal
In this letter, we demonstrate that a high key creation efficiency can be achieved in a stable differential phase shift quantum key distribution system by using three cascaded Mach–Zehnder interferometers. A pulse is split into four independent pulses, and the bit information is carried by one of the three phase differences between the sequential pulses. Any birefringence effects and polarization-dependent losses in the long-distance fiber are automatically compensated with a Faraday mirror. Due to the neatly use of three cascaded interferometers, the key creation efficiency reaches 3/4. © 2004 American Institute of Physics.


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