| 摘要 |
PCT No. PCT/GB93/02637 Sec. 371 Date Aug. 15, 1995 Sec. 102(e) Date Aug. 15, 1995 PCT Filed Dec. 23, 1993 PCT Pub. No. WO94/15422 PCT Pub. Date Jul. 7, 1994A method of communication uses quantum cryptography to encode and decode a signal. A key is distributed on a quantum channel, and information subsequent communicated between the transmitter and receiver on a public channel to determine whether the key has been intercepted. A common transmission medium is used for the quantum channel and public channel. A calibration signal is transmitted over the public channel on the common transmission medium to calibrate the system for the subsequent transmisison of a key on the quantum channel. The trasmission medium may be an optical fibre and the transmitter may switch between a single-photon output and a multiple-photon output to provide quantum channel and public channel respectively.
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