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A Fast Time Synchronization Method Based on Laser Pulses for Satellite-to-Ground Quantum Key Distribution

A quantum key distribution and laser pulse technology, applied in key distribution to achieve precise time synchronization

Active Publication Date: 2020-04-21
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that, aiming at the technical problems existing in the time synchronization method based on laser pulses in the existing satellite-ground quantum key distribution system, the present invention provides a more intelligent, fast and efficient satellite-ground quantum key Laser Pulse-Based Fast Time Synchronization Method for Distribution Systems

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  • A Fast Time Synchronization Method Based on Laser Pulses for Satellite-to-Ground Quantum Key Distribution

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Embodiment Construction

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] figure 1 Shown is the organizational structure and mutual relationship diagram of various sequences involved in the present invention. combine figure 1 , a fast time synchronization method based on laser pulses for satellite-to-earth quantum key distribution of the present invention, the steps are:

[0051] S1: The satellite and the ground station respectively record the time measurement value sequence of the detected synchronous pulse and quantum state signal, marked as TA and TB, in the sequence TA(TB) TA.Value[i](TB.Value[i] ) represents the time measurement value of the i-th pulse, TA.CH[i](TB.CH[i]) represents the channel to which the i-th pulse belongs, including quantum channels (H, V, D, A) and synchronization channels (S ) (this patent takes the polarization direction to characterize the quantum state as an example,...

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Abstract

Disclosed by the present invention is a fast time synchronization method on the basis of a laser pulse for satellite-ground quantum key distribution, which comprises the following steps: S1: a satellite and a ground station recording a time measurement sequence of detected synchronous pulses and a quantum state signal respectively and labeling same as TA and TB; S2: extracting a synchronous pulse time measurement sequence SA from TA, and recording an index address sequence LA of SA in TA; S3: extracting a synchronous pulse time measurement sequence SB from TB, and recording an index address sequence LB of SB in TB; S4: calculating a peak saliency value Sτ for determining time synchronization performance; S5: calculating a background compliance count Racc; S6: accurately mapping the synchronous pulses and calculating a synchronous pulse mapping sequence MS; S7: and according to the MS sequence, using a measurement time on the satellite as the standard time, and accurately mapping the quantum state signal measured by the ground station to obtain a ground station quantum state signal mapping sequence MT. The present invention has the advantages of being adaptive, fast, highly efficient and accurate.

Description

technical field [0001] The invention relates to a time synchronization method based on laser pulses, in particular to a fast time synchronization method based on laser pulses for satellite-to-earth quantum key distribution. Background technique [0002] With the continuous progress of computing technology, especially the rapid development of quantum computing technology, encryption technology based on the complexity of mathematical problems is facing severe security threats. Quantum key distribution is different from traditional encryption technology. Based on the basic principles of quantum mechanics, it can generate information-theoretical security keys for negotiation between the two parties in communication. At the same time, it can realize information-theoretic secure communication with the "one-time pad" encryption algorithm. [0003] In the process of quantum key distribution, both communicating parties need to encode, transmit and measure the quantum state. In pract...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04B10/118H04B10/70H04L9/08
CPCH04B10/118H04B10/70H04J3/0638H04J3/0682H04L9/0855H04L9/0858
Inventor 吴纯青
Owner NAT UNIV OF DEFENSE TECH
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