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Methods and system for quantum key distribution over multi-user WDM network with wavelength routing

By using wavelength routing technology and differential phase detection in a multi-user wavelength division multiplexing network, the problem of multi-user quantum key distribution in the network is solved, efficient and secure quantum key distribution is achieved, the system structure is simplified and the cost is reduced noise.

Active Publication Date: 2008-06-25
THE CHINESE UNIVERSITY OF HONG KONG
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Problems solved by technology

Furthermore, since all users in the network (even if he or she is not the intended receiver) can simultaneously receive the signal from the transmitter, this configuration cannot identify which user should receive the signal
That is, the system cannot just establish a link between two specific users for quantum key distribution

Method used

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Embodiment Construction

[0014] The present invention will be described in detail below with reference to the drawings.

[0015] Fig. 2 shows an embodiment of a communication system for distributing quantum keys through a multi-user WDM network according to the present invention. As shown in FIG. 2, the communication system includes: a transmitter 100; a plurality of receivers 200 (8 receivers in this embodiment), each of which is assigned a different receiving wavelength (for example, λ1-λn, where n= 8); and an 8-user WDM network linking the transmitter 100 to the receiver 200.

[0016] In the present invention, the wavelength routing technology is used to perform quantum key distribution among specific users. In this embodiment, wavelength routing can be implemented by a wavelength division demultiplexer 400 such as an arrayed waveguide grating (AWG). Therefore, the transmitter 100 can select a wavelength to establish a channel with each receiver (for example, from channel 1 to channel n), so that the t...

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Abstract

A system and a method for quantum key distribution over a multi-user wavelength division multiplexing (WDM) network are disclosed. The system comprises a tunable or multi-wavelength transmitter; a plurality of receivers, each assigned a receiving-wavelength; and a multi-user WDM network linking the transmitter to the receivers. The transmitter can select a receiver among the receivers to be communicated therewith and transmit quantum signals to the selected receiver over the WDM network. The quantum signals are at a wavelength equal to a receiving-wavelength of the receiver. Therefore the WDM network allows quantum signals to be communicated between the transmitter and the receivers by wavelength routing.

Description

Technical field [0001] The invention relates to a system for transmitting encrypted data. In particular, the present invention relates to a technique known as the use of wavelength routing to distribute quantum keys through a multi-user wavelength division multiplexing (WDM) network. Background technique [0002] Since quantum cryptography can provide fundamental security through the laws of quantum theory, quantum cryptography is considered a natural candidate for enhancing traditional cryptography. Most research in this field focuses on point-to-point transmission between two users. At present, quantum cryptography has been successfully implemented in optical fiber and point-to-point links in free space. However, so far, there have been only limited results in quantum key distribution on the network. Quantum key distribution on the network has more problems than point-to-point transmission. In fact, it has been considered that the distribution of quantum keys on the network is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02
CPCH04J14/0227H04L9/0852H04J14/0282H04J14/0246H04B10/70H04B10/2581H04J14/02
Owner THE CHINESE UNIVERSITY OF HONG KONG
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