发明名称 |
METHOD AND APPARATUS FOR POLARISATION-INSENSITIVE QUANTUM CRYPTOGRAPHY |
摘要 |
<p>A communication system uses quantum cryptography for the secure distribution of a key. A single-photon signal is phase-modulated and transmitted over a pair of time-multiplexed transmission paths. With each original single-photon signal in a given one of the transmission paths, a duplicate signal is transmitted. The duplicate is identically modulated and orthogonally polarized. At the receiver, the outputs of the two paths are combined interferometrically. A single polarization-insensitive measurement is derived from the combined contributions of the orthogonally polarized signals.</p> |
申请公布号 |
EP0972373(B1) |
申请公布日期 |
2005.08.03 |
申请号 |
EP19970923201 |
申请日期 |
1997.05.19 |
申请人 |
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY |
发明人 |
TOWNSEND, PAUL DAVID |
分类号 |
H04B10/00;H04L9/08;H04L9/12;H04L9/38;(IPC1-7):H04L9/08 |
主分类号 |
H04B10/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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