Quantum cipher communication system

Details Quantum cipher communication system Quantum cipher communication system

2007-12-04

2007-12-04

Vu, Kim (Department: 2135)

Cryptography

Communication system using cryptography

C380S256000, C380S278000, C380S279000, C713S150000

Reexamination Certificate

active

09787029

ABSTRACT:
A quantum cipher communication system includes a sender's apparatus, a recipient's apparatus and a transmission path. The sender's apparatus includes a beam splitting for splitting a laser beam into a weak signal light and an intense reference light, a phase modulation unit for imparting a phase change on either the weak signal light or the intense reference light. The recipient's apparatus includes a phase modulation unit for imparting a phase change on either the weak signal light or the intense reference light, a superimposing unit for superimposing the weak signal light and the intense reference light, a pair of photoconductive diodes for converting two output lights from the superimposing unit into electric signals, and an amplifying unit for amplifying a difference signal between the electric signals, wherein the recipient assigns bit values by comparing the difference signal with threshold values.

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