QUANTUM SECRET SHARING SYSTEM AND QUANTUM SECRET KEY GENERATION METHOD

摘要

PPROBLEM TO BE SOLVED: To provide a quantum secret key sharing system which is operated without being affected by form birefringence between devices connected by an optical fiber transmission line or the like and contributes and in which all transmitted and received photons contribute to the generation of a key bit, and a method for generating a quantum secret key. PSOLUTION: The quantum secret sharing system comprises: a transmitter provided with a means for generating the optical pulse string of a fixed interval and a means for modulating the phase of the respective pulses of the generated optical pulse string by 0 or π and transmitting it; a repeater provided with a means for modulating the phase of the respective pulses of the optical pulse string of optical signals to be transmitted by 0 or π and transmitting them; and a receiver provided with a means for adding time delay equal to the pulse interval of the optical pulse string between routes for which the optical pulse string of the optical signals to be transmitted is branched into two, a means for multiplexing the optical pulse strings branched into two and a means for detecting the optical pulses of the multiplexed optical pulse string. PCOPYRIGHT: (C)2007,JPO&INPIT