QKD system network

A system network and network system technology, which is applied in the field of industrial practicability of quantum key distribution system network, and can solve the problems of complex configuration, impracticality, and high cost.

Inactive Publication Date: 2007-06-06
MAGIQ TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this configuration is more complicated and more expensive as it requires two QKD stations for relay station 30
Replicating this configuration very quickly for commercially viable even larger QKD networks is an expensive and impractical proposition

Method used

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Embodiment Construction

[0029] The present invention allows organizing intermediates ("relays") in a more economical manner than prior art QKD system networks by adding optical path switches to Alice and / or Bob QKD stations ("boxes") between two end users chain of stations. The switch allows a relay station to have a single QKD station that interacts with neighboring QKD stations depending on the state of the optical switch.

[0030] FIG. 3 is a schematic diagram of a QKD system 50 in accordance with the present invention. The QKD system comprises an optically-lined cascaded chain of cassettes Al, B and A2. The configuration of QKD system 50 may be abbreviated as P1-A1-B-A2-P2, where P1 and P2 are end users operatively coupled to respective QKD stations A1 and A2 via links LA1 and LA2. In the QKD system 50, only Bob (B) is connected to or includes an optical switch 55 that allows B to establish a connection with A1 or A2, for example via fiber optic links F1, F2 and F3. This setting allows only co...

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Abstract

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 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.

Description

[0001] priority statement [0002] This application claims priority to US Provisional Patent Application No. 60 / 583,515, filed June 28,2004. technical field [0003] The present invention relates to and has industrial applicability related to quantum cryptography (quantum cryptography), specifically related to and has industrial applicability about quantum key distribution (QKD: quantum key distribution) system network. Background technique [0004] Quantum key distribution involves establishing a secret key between a sender ("Alice") and a receiver ("Bob") using weak (eg, 0.1 photons on average) sent over a "quantum channel". The security of key distribution is based on the principle of quantum mechanics that any measurement of a quantum system in an unknown state will change its state. Thus, an eavesdropper ("Eve") attempting to intercept or measure a quantum signal would introduce errors into the transmitted signal, thereby revealing its existence. [0005] First propos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04K1/00
Inventor 哈里·维格奥德留斯·贝尔赞基斯
Owner MAGIQ TECH INC
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