Phase modulation method of quantum cryptographic receiving device and quantum cryptographic transmitting device and optical pulse

摘要

Optical pulse 31x - 34x shows the optical pulse of the outward trip. Optical pulse 31y - 34y after period c elapses, shows the case where optical pulse 31x - 34x advances the returning/repeating road. Depending, optical pulse 31y - 34y the respective optical pulse is 31x - 34x. You pay attention to optical pulse 31x. Receiving end control control equipment E _B, the phase modulation quantity 'B1 to the optical pulse 31x due to PMB in time t 2 c , in the receiving end buffer remembers. And, with the control of receiving end control control equipment E _B, optical pulse 31y phase it modulates PMB, on the basis of the phase modulation quantity 'B1 which is remembered in the receiving end buffer in the time t 2 after the period c. This way, PMB it is possible to cancel the effect of phase modulation quantity 'B1 to the optical pulse 31x in the outward trip by phase modulating optical pulse 31y on the basis of phase modulation quantity 'B1. Optical pulse concerning 32x - 34x, it is similar to optical pulse 31x.