A free-space-based differential phase shift quantum key distribution scheme with higher key creation efficiency |
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| Authors: | Jindong Wang Xiaojuan Qin Zhengjun Wei Songhao Liu |
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| Affiliation: | a Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510631, People’s Republic of China
b Guangdong Radio & TV University, Guangzhou 510091, People’s Republic of China |
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| Abstract: | Differential phase shift quantum key distribution scheme has been improved by introducing a passive path selection structure at the transmitter including two polarization controllers used to mark the photon pulses and a polarizing beam splitter to distinguish these pulses so that can make different time delay at the receiver. Theoretical analysis indicates that a free-space-based differential phase shift quantum key distribution system with this proposed improvement will have high efficiency with the utilization ratio of photons reaching 100% under ideal condition. |
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