QKD system and method based on COW protocol

A protocol and quantum technology, applied in transmission systems, digital transmission systems, and key distribution, can solve the problems of narrow-linewidth CW lasers, which are expensive, difficult to popularize and apply on a large scale, difficult to integrate, and miniaturized, to achieve product integration , Eliminate the base matching problem and reduce the preparation cost

Pending Publication Date: 2017-03-15
ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The COW protocol uses the coherence between any pair of adjacent pulse trains to detect whether there is an eavesdropper. The phase stability of adjacent pulses is the basis for coherence detection. Therefore, the traditional QKD system based on the COW protocol needs to use a narrow The linewidth laser emits continuous light, and the intensity modulator generates pulsed light to ensure the stability of the two adjacent pulse phases. The narrow linewidth continuous laser is expensive and expensive, and it is difficult to be widely used; in addition, the intensity modulator Normal operation requires high-speed electrical signal drive, and the amplitude of the driving electrical

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  • QKD system and method based on COW protocol
  • QKD system and method based on COW protocol

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0047] Example 1

[0048] The COW protocol-based QKD system of this embodiment is as figure 1 As shown, it includes the quantum key encoding terminal Alice, the quantum key decoding terminal Bob, and the quantum key distribution channel connecting Alice and Bob.

[0049] Alice is provided with a phase modulated light source for outputting double pulse sequence signal light and an optical attenuator VOA (in this embodiment, a tunable optical attenuator) for attenuating the double pulse sequence signal light. Attenuate to the single photon level).

[0050] Such as figure 1 As shown, the phase modulated light source of this embodiment includes a pulse generating laser LD1, a phase preparation laser LD2, a first three-port circulator CIR1; the three ports of the first three-port circulator CIR1 are respectively the first port 1 along the optical path , The second port 2 and the third port 3. Among them, the first port 1 and the second port 2 are respectively connected to the pulse gene...

Example Embodiment

[0092] Example 2

[0093] The QKD system and method in this embodiment are the same as those in Embodiment 1. The difference is that the QKD system in this embodiment performs the detection sub-unit in the coherence detection unit on the Bob side compared to the QKD system in Embodiment 1. Improve. Specific as Figure 4 As shown, a third beam splitter BS3 is additionally provided as a third beam splitting module, the first fiber delay line DL1, and the third single photon detector D is eliminated M2 . Port b of the second beam splitter BS2 is connected to one input port of the third beam splitter, and port 3 of the second three-port circulator is connected to the other input port of the third beam splitter through the optical fiber delay line DL. The output port of the beam splitter and the second single-photon detector D M1 Connected.

[0094] In this embodiment, the delay time of the first optical fiber delay line DL1 can be set as required.

[0095] By setting the first fiber d...

Example Embodiment

[0097] Example 3

[0098] Same as Embodiment 2, except that the coherence detection unit on the Bob side does not have a separate detection subunit, such as Figure 5 As shown, the second single-photon detector D is removed M1 , The fourth beam splitter BS4 and the second fiber delay line DL2 as the fourth beam splitting module are additionally provided. An output port of the first beam splitter BS1 is connected to an input port of the fourth beam splitter, port b of the second beam splitter BS2 is connected to an input port of the third beam splitter, and a port of the second three-port circulator 3 is connected to the other input port of the third beam splitter through the first fiber delay line DL1, and the output port of the third beam splitter is connected to the fourth beam splitter BS4 through the second fiber delay line DL2.

[0099] In this embodiment, the delay time of the first fiber delay line DL1 and the second fiber delay line DL2 can be set as required.

[0100] By se...

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Abstract

The invention discloses a QKD system and method based on a COW protocol. The QKD system comprises a quantum key coding end and a quantum key decoding end which are connected through a quantum key distribution channel. The quantum key coding end comprises a phase modulation light source. The phase modulation light source codes a light signal based on the COW protocol, thereby outputting double-pulse sequence signal light to the quantum key decoding end through the quantum key distribution channel. When quantum key distribution is carried out, the double-pulse sequence signal light is coded at the quantum key coding end based on the COW protocol and then is sent to the quantum key decoding end through the quantum key distribution channel for decoding, thereby obtaining a corresponding decoding result. According to the QKD system and method provided by the invention, coding and decoding are carried out based on the COW protocol, the basis matching problem is eliminated, the protocol efficiency is high, the light source is modulated by employing a phase, the high efficiency is obtained, and moreover, the QKD system cost problem of COW protocol coding is overcome, thereby facilitating integration and miniaturization of the product.

Description

technical field [0001] The present invention relates to the field of quantum communication, in particular to the technical field of quantum key distribution, and in particular to a QKD system and method based on the COW protocol. Background technique [0002] Secure communication is a communication system that encrypts the code stream of the transmitted information source at the sending end and decrypts and authenticates at the receiving end to prevent information from being disturbed or eavesdropped. It can ensure the security and integrity of the information transmitted by both parties in communication. At present, the RSA public key system is widely used in secure communication. The security of this public key system is guaranteed by the complexity of the algorithm and the limitation of computer computing power. The continuous improvement of modern mathematical computing capabilities and the rapid development of quantum computers have been threatening the security of the ...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0852Y02D30/70
Inventor 富尧李浩泉
Owner ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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