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Offline phase compensation method for high-speed drift under CVQKD system and storage medium

A phase compensation and high-speed technology, applied in transmission systems, digital transmission systems, and key distribution, can solve problems such as difficult to further improve real-time compensation efficiency, limited drift speed, and difficult to compensate accurately, so as to avoid real-time performance and improve compensation accuracy , the effect of high compensation accuracy

Inactive Publication Date: 2019-10-25
上海循态量子科技有限公司
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Problems solved by technology

However, the drift speed that these two methods can handle is limited. When the phase drift speed is too fast, it is difficult to perform accurate compensation, and the accuracy achieved is relatively limited, and the efficiency of real-time compensation is difficult to further improve.

Method used

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  • Offline phase compensation method for high-speed drift under CVQKD system and storage medium
  • Offline phase compensation method for high-speed drift under CVQKD system and storage medium

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0051] According to the off-line phase compensation method for high-speed drift under a CVQKD system provided by the present invention, the method includes the following steps:

[0052] Step A: Setting and transmission of training data and effective data, specifically: insert training data known to Alice and Bob in the middle of effective data transmission, and transmit through the quantum channel, and the compensation angle is preset at Bob’s end;

[0053] Step B: Establish an error function according ...

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Abstract

The invention provides an off-line phase compensation method for high-speed drift under a CVQKD system and a storage medium. The off-line phase compensation method comprises the following steps: stepA, setting and transmitting training data and effective data; step B, constructing an error function and solving an optimal value of the error function; and step C, solving an optimal compensation angle and implementing compensation. According to the method, the phase compensation precision of the CVQKD system based on the Gaussian modulation coherence state can be improved to 0.0001 rad when thephase drift speed is high.

Description

technical field [0001] The present invention relates to the technical field of phase compensation for quantum key distribution, in particular to an off-line phase compensation method for high-speed drift under a CVQKD system and a storage medium, and in particular to an off-line compensation method using feedback optimization iteration, that is, by solving The minimum mean square error is used to solve the optimal phase compensation angle, which is then transmitted to Alice through the classic channel and compensated by Alice. Offline high-precision compensation technology. Background technique [0002] With the rapid development of information technology, people have higher and higher requirements for security. Quantum secure communication based on quantum mechanics has physical unconditional security and has become the focus of attention. [0003] For example, the patent document CN106533565A discloses a quantum secure communication method and device. The technical solutio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 黄鹏李登文曾贵华
Owner 上海循态量子科技有限公司
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