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Synchronization method and device applied to quantum secret key distribution system and distribution system

A technology of quantum key distribution and synchronization device, applied in synchronization device and key distribution, can solve problems such as multi-occupancy and realization efficiency, achieve considerable economic benefits, save components, and realize high efficiency.

Active Publication Date: 2018-06-26
QUANTUMCTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The technical problem to be solved by the present invention is to provide a synchronization method applied to the quantum key distribution system that reduces the system cost, solves the problem of occupying one more channel (wavelength) and the problem of low implementation efficiency in existing solutions

Method used

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  • Synchronization method and device applied to quantum secret key distribution system and distribution system
  • Synchronization method and device applied to quantum secret key distribution system and distribution system
  • Synchronization method and device applied to quantum secret key distribution system and distribution system

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Embodiment 1

[0062] Such as image 3 As shown, in this embodiment, the system used in the quantum key distribution method includes a laser, an optical fiber, and a single-photon detector, and the laser is connected to the single-photon detector through an optical fiber. Compared with the existing synchronization scheme that uses wavelength synchronization light different from quantum signal light, this scheme does not need to use synchronization light laser, PIN tube detector and WDM device, which simplifies the system installation.

[0063] see Figure 4 As shown, the emission scheme of the transmitting end of the above-mentioned system is as follows: the laser follows a fixed frequency f 1 Emit strong light ① and ②, within the time interval between two strong lights ① and ②, according to the fixed frequency f 2 emit quantum signal light. where f 2 >>f 1 . The system starts to work, first sends a strong light, and numbers the strong light sent. A group of quantum signal lights behi...

Embodiment 2

[0079]This embodiment provides a synchronization device, including a laser arranged at the transmitting end of the quantum key distribution system, an optical fiber, and a detector arranged at the receiving end of the quantum key distribution system. The difference from Embodiment 1 is that the detector includes Two: PIN tube detectors and single photon detectors.

[0080] The light-emitting scheme of the transmitting end of the synchronization device is as in the first embodiment, and the detection scheme of the receiving end of the system is different from the first embodiment, that is, the PIN tube detector is used to detect the strong light, and the single-photon detector is used to detect the quantum signal light. That is, the hardware structure and connection method of the receiving end can be the same as the synchronization device of the existing quantum key distribution system.

[0081] In the above two embodiments, at least one transmitter at the transmitting end of t...

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Abstract

The invention provides a synchronization method applied to a quantum secret key distribution system. A system employed by a quantum secret key distribution method comprises a laser device arranged ata transmission end of the system, a fiber and a detector arranged at a receiving end of the system, wherein the laser device not only transmits a quantum signal and further transmits strong light, wavelength of the strong light is identical to the quantum signal light, intensity of the strong light is stronger than that of the quantum signal light, the quantum signal light and the strong light aretransmitted to the detector at the receiving end of the system through a channel of the fiber for detection, two ends of the system are synchronized according to the strong light signal, after the strong light satisfies attenuation through a transmission link, the strong light can still be detected by the detector. The invention further provides a synchronization device employing the method and asecret key distribution system of the synchronization device. The system is advantaged in that system cost is reduced, and problems that one extra channel (wavelength) is occupied and realization efficiency is low in a scheme in the prior art are solved.

Description

technical field [0001] The invention relates to the field of quantum secure communication, and in particular provides a synchronization method and device suitable for a quantum key distribution system and a quantum key distribution system. Background technique [0002] The fundamental difference between Quantum Key Distribution (QKD) and the classical key system is that it uses a single photon or entangled photon pair as the carrier of the key, and the basic principles of quantum mechanics guarantee that the process cannot be eavesdropped or deciphered , thus providing a more secure key system. At present, the technology of using entangled photon pairs to realize quantum key distribution is still far from commercialization and practicality, so the existing commercial QKD systems mostly use quantum key distribution technology based on single photon realization. [0003] The basic process of quantum key distribution based on single photon is: [0004] 1) Alice at the transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/80H04J14/02H04L7/00H04L9/08
CPCH04B10/80H04J14/0227H04L7/0075H04L9/085H04L9/0852H04L9/0869
Inventor 姚海涛汤艳琳唐世彪贾云
Owner QUANTUMCTEK
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