Two-way Quantum Time Synchronization Method Based on Frequency Entanglement Light Source

A time synchronization and entanglement source technology, applied in photonic quantum communication, time division multiplexing system, electrical components, etc., can solve problems that affect measurement accuracy and cannot overcome time fluctuations in optical fiber links

Active Publication Date: 2020-10-23
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

The main problem of this method is that it cannot overcome the time fluctuation caused by the optical fiber link, which affects the measurement accuracy

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  • Two-way Quantum Time Synchronization Method Based on Frequency Entanglement Light Source

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Embodiment Construction

[0011] 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.

[0012] The present invention provides a two-way quantum time synchronization technology based on frequency entanglement light source, its principle is as follows figure 1 As shown, it includes three parts: preparation, transmission and detection of entangled light source.

[0013] The invention adopts 780nm laser to pump PPKTP crystal to spontaneously convert parameters to generate frequency entanglement source, and this technology is very mature in the field of quantum optics.

[0014] A and B are connected by an optical fiber of length l. The No. 1 entanglement source and the No. 2 entanglement source are located in A and B respectively, and the same wavelength of pump light and nonlinear medium are used to ensure that the wavelength distribution of the generated entangl...

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Abstract

The invention provides a bidirectional quantum time synchronization method based on frequency entangled light sources. Two entangled light sources with same wavelength are placed at a place A and a place B respectively, and signal lights generated by the entangled light sources pass through an optical fiber circulator, are transmitted in opposite directions through a same optical fiber, and are detected by detectors at the opposite places; idle lights generated by the entangled light sources are detected by a detector at a uniform place of the entangled light sources; a clock a at the place arecords the time (tij} and time (t2j} for photons emitted by the entangled light source at the place a to reach the detectors at two places, and a clock b at the place b records time (t3j} and time (t4j} for photons emitted by the entangled light source at the place b to reach the detectors at two places, wherein j is representative of jth photon; the (tij} and (t2j} are subjected to cross-correlation operation to obtain t2-t1; the (t3j} and (t4j} are subjected to cross-correlation operation to obtain t4-t3; the clock difference t0 between the clock a and the clock b is equal to half of the difference of (t2-t1) and (t4-t3). The bidirectional quantum time synchronization method based on the frequency entangled light sources is high in measurement precision, and an applied device is simplein structure.

Description

technical field [0001] The invention belongs to the technical field of time and frequency, and in particular relates to a two-way quantum time synchronization method. Background technique [0002] Quantum time synchronization technology is a new time synchronization technology proposed at the beginning of this century. This technology utilizes quantum light pulse and quantum coincidence detection technology with frequency entanglement and photon number compression characteristics to make the existing time synchronization accuracy break through the limit of shot noise, and can improve time synchronization accuracy to sub-picosecond or even femtosecond level. In addition to greatly improving the accuracy, another advantage of quantum time synchronization technology is that it can combine quantum time synchronization protocol with quantum secure communication to realize quantum time synchronization protocol with security function. In addition, based on the frequency entangleme...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/70H04J3/06
CPCH04B10/70H04J3/0638
Inventor 董瑞芳侯飞雁张首刚
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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