公开(公告)号：US10110378B2

公开(公告)日：2018-10-23

申请号：US15176428

申请日：2016-06-08

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Sang Wook Han ,  Sung Wook Moon ,  Yong-Su Kim ,  Il Young Kim ,  Byungkwon Park

IPC: H04L9/08 ,  B82Y20/00 ,  H04B10/70

Abstract: Disclosed is a method for stabilizing a quantum cryptography system, which includes: determining whether the quantum cryptography system operates in a stabilized state, on the basis of a bit error rate or a key rate of the quantum cryptography system; and readjusting an arrival time of a gate pulse or a laser operation time so that an arrival time of a single photon for a photon detector is aligned with the arrival time of the gate pulse, when the quantum cryptography system does not operate in a stabilized state. Here, the quantum cryptography system may be a two-way quantum cryptography system.

公开(公告)号：US09722785B2

公开(公告)日：2017-08-01

申请号：US14590585

申请日：2015-01-06

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yong-Su Kim ,  Sang Wook Han ,  Sung Wook Moon ,  Yujun Choi

IPC: H04L9/08 ,  H04B10/70

CPC classification number: H04L9/0855 ,  H04B10/70 ,  H04L2209/34

Abstract: An apparatus for quantum cryptographic communication includes a light source configured to generate an optical pulse which is transmitted to a plurality of quantum code sending devices, and a quantum entanglement measuring unit configured to receive the optical signal generated from each of the plurality of quantum code sending devices and measure a relation among quantum states of the optical signals received from the plurality of quantum code sending devices; the optical signal being generated by encoding a key to a quantum state of the optical pulse. The apparatus for quantum cryptographic communication may further include a signal direction determining unit, a reflector for reflecting the optical pulse or the optical signal, an arbitrary phase shifter, or a modulator for encoding a digital signal corresponding to the key to the optical pulse.