Method and device for differential optical phase modulation in quantum key distribution system

摘要

A transmitting apparatus in a quantum key distribution system, includes: an optical interferometer to receive a single-photon pulse inputted from a light source and to provide two optical paths with a predetermined path difference, the two optical paths used for the single-photon pulse to pass through the optical interferometer; and an optical phase modulator to perform a temporal differential phase modulation of the single-photon pulse which has passed through the optical interferometer, wherein the single-photon pulse, after passing through the optical interferometer, has a probability distribution divided into two separate regions in time domain.

主权项

1. A transmitting apparatus in a quantum key distribution system, the apparatus comprising:
an optical interferometer configured to
receive a single-photon pulse inputted from a light source andprovide the single-photon pulse with two optical paths having a predetermined path difference between a first optical path and a second optical path, the two optical paths including the first optical path and the second optical path and being used for the single-photon pulse to pass through the optical interferometer, wherein the single-photon pulse, after passing through the optical interferometer, has a probability distribution divided into two separate regions in a time domain; andan optical phase modulator configured to perform a temporal differential phase modulation of the single-photon pulse which has passed through the optical interferometer, by imparting a phase-shift oppositely to the single-photon pulse for the two separate regions.