A free-space-based differential phase shift quantum key distribution scheme with higher key creation efficiency

作者：Wang Jindong^*; Qin Xiaojuan; Zhang Huani; Wei Zhengjun; Liao Changjun; Liu Songhao

来源：Optics Communications, 2009, 282(16): 3379-3381.

DOI：10.1016/j.optcom.2009.05.020

• Differential-phase-shift quantum key distributions
• Free spaces
• High-efficiency
• Path selection
• Photon pulse
• Polarization controllers
• Polarizing beam splitters
• Utilization ratios

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.

• 出版日期2009-8-15
• 单位华南师范大学