| 摘要 |
QKD system networks ( 50, 200, 300 ) and methods of communicating between end-users (P 1 , P 2 ) over same are disclosed. An example QKD system network ( 50 ) includes a first QKD station (A 1 ) and a second QKD station (A 2 ) with a relay station ( 58 ) in between. The relay station includes a single third QKD station (B) and an optical switch ( 55 ). The optical switch allows the third QKD station to alternately communicate with the first and second QKD stations so as to establish a common key between the first and second QKD stations. The end-users are coupled to respective QKD stations A 1 and A 2 . A secret key (S) is shared between P 1 and P 2 by QKD station B being able to independently form keys with A 1 and A 2 . This basic system, represented as P 1 -A 1 -B-A 2 -P 2 , can be expanded into more complex linear networks, such as P 1 -A 1 -B 1 -A 2 -B 2 -P 2 with B 1 and A 2 making up the relays. The basic QKD system network can also be expanded into multi-dimensions.
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