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Safe quantum time synchronization method and device based on frequency entanglement source

A technology of time synchronization and time synchronization system, which is applied to secure communication devices, photon quantum communication, and key distribution, which can solve problems such as time signal tampering, keeping unchanged, and security vulnerabilities, so as to ensure high precision, high security, and avoid The effect of error influence

Active Publication Date: 2021-04-06
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

[0003] At the same time, the safety and reliability of the time synchronization system is related to national security and the lifeline of the economy. The existing time synchronization system has the security risk of being cracked: the one-way time transfer system does not measure the round-trip delay of the timing signal, and the time signal can be detected. Third-party tampering; two-way time synchronization is robust to spoofing attacks, but there are still many security holes
At present, researchers have carried out research on secure quantum time transfer technology based on polarization entangled light sources. The experimental results show that when the time transfer system is disturbed and the time transfer deviates, its polarization entanglement characteristics remain unchanged before and after the attack, indicating that the system In addition, based on the quantum key distribution of polarization entangled light sources, researchers have also carried out preliminary secure time transfer, but how to combine the two is one of the problems currently facing

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  • Safe quantum time synchronization method and device based on frequency entanglement source

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0022] The technical solution adopted by the present invention to solve its technical problems comprises the following steps:

[0023] 1) Transmit one of the frequency-entangled two-photons to the local end, and one to the place to be synchronized;

[0024] 2) The positive dispersion module is added synchronously, and the sum of the dispersion of the transmission path and the positive dispersion module is β;

[0025] 3) Add a dispersion compensation module with a dispersion amount of -β at the local end;

[0026] 4) After measuring two paths of entangled photons, one passes through a dispersion module with a dispersion value of β, and the other path passes through a dispersion compensation module with a dispersion value of -β, the two photons meet the time width τ 0 , and...

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Abstract

The invention provides a safe quantum time synchronization method and device based on a frequency entanglement source, and the method comprises the steps: enabling the non-classical quantum characteristic non-localized dispersion elimination characteristic of the frequency entangled source to be applied to a high-precision quantum time synchronization system; and using the entangled photon arrival time signal used for time synchronization measurement for safety detection of the quantum time synchronization system at the same time, wherein an additional detection device is not needed, so that high-precision characteristic of the quantum time synchronization system is guaranteed, and the safety detection function is achieved; and meanwhile, the error influence on the synchronization precision of the time synchronization system caused by an extra device is also avoided.

Description

technical field [0001] The invention belongs to the technical field of time and frequency, and relates to a quantum time synchronization method, in particular to a quantum time synchronization method based on a frequency entanglement source and having a safety detection function. Background technique [0002] Quantum time synchronization technology has great application prospects in cutting-edge scientific research and technological applications such as precision measurement, deep space exploration, global navigation and positioning, and gravitational wave detection. Quantum time synchronization technology that combines entangled light sources with low-noise quantum detection technology is used It is expected to improve the time synchronization accuracy by thousands of times, reaching sub-picosecond or even femtosecond level. [0003] At the same time, the safety and reliability of the time synchronization system is related to national security and the lifeline of the econom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04J3/06H04B10/70
CPCH04L9/0852H04B10/70H04J3/0638
Inventor 权润爱董瑞芳项晓刘涛张首刚
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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