Clock synchronization system and method based on quantum entanglement

A clock synchronization and quantum entanglement technology, applied in the field of quantum information and optical communication, can solve the problems of difficult alignment between satellites and ground stations, large photon attenuation, etc., to improve the clock synchronization accuracy, reduce the impact, and avoid the effect of precision degradation.
CN109547144AActive Publication Date: 2019-03-29GUANGDONG INCUBATOR TECH DEV CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
GUANGDONG INCUBATOR TECH DEV CO LTD
Publication Date
2019-03-29

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Abstract

The invention discloses a clock synchronization system and method based on quantum entanglement. The system includes an entanglement source unit, a transmission unit, a clock synchronization unit Alice, a clock synchronization unit Bob and a measurement unit. According to the system, entangled photons of a single polarization state are employed as synchronization signal carriers, and Faraday mirrors and bidirectional paths are utilized to realize automatic compensation of polarization jitters in optical fiber, frequency-approximated entangled photon pairs are formed by a 790nm laser-pumped type-II phase-matched crystal, and delay time of the two optical paths is precisely controlled through an electrically controllable optical delay line, a maximum value of an HOM sag between the two partsof to-be-carried-out clock synchronization is obtained, thus accurate time difference with a benchmark as an intermediate unit is obtained, and then clock synchronization of the two parts is realizedthrough direct measurement of the entangled photons.
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Description

technical field

[0001] The present invention relates to the technical field of quantum information and optical communication, and more specifically, to a clock synchronization system and method based on quantum entanglement. Background technique

[0002] Time (frequency) is one of the most basic physical quantities for people to understand nature. In 1967, the Thirteenth International Conference on Weights and Measures decided that in the International System of Units (SI), the time unit second (S) is defined as: 133 C S Duration of 9192631770 periods of transition radiation between two hyperfine energy levels of the atomic ground state. Because time is currently the basic physical quantity with the highest measurement accuracy, other physical quantities are often converted into time frequency and then measured. For example, the length of a meter is defined as the distance traveled by light in a vacuum within a time interval of 1 / 299793458 seconds.

[0003] In the field of...

Claims

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