Phase compensation method of quantum key distribution system

A quantum key distribution and system phase technology, applied in key distribution, can solve the problems of inaccurate estimation, noise, and inability to work, and achieve the effects of high-precision phase estimation, high phase estimation accuracy, and simple calculation.

Active Publication Date: 2015-01-21
SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD +1
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Problems solved by technology

But this method is only suitable for the situation where the signal-to-noise ratio is much greater than 1. When the signal-to-noise ratio is close to 1, it is difficult to find the peak of the sine wave, and the estimation of the phase will be very inaccurate. Under the circumstances, this method wil

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  • Phase compensation method of quantum key distribution system
  • Phase compensation method of quantum key distribution system
  • Phase compensation method of quantum key distribution system

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[0030] 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 modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0031] Analyzing the statistical model of sending data and receiving data, in the continuous variable quantum key distribution system, the quantum state sent by Alice (the sender) is subject to Gaussian modulation, that is, the position and momentum of the quantum state are subject to Gaussian distribution. The sending end makes the sent data obey the Gaussian distribution by loading the signal that obeys the Rayleigh distribution on the amplitude modulator AM and loading the signal that is uniform...

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Abstract

The invention discloses a phase compensation method of a quantum key distribution system. The phase compensation method comprises the step A of phase estimation, wherein the angle of phase drift is calculated through a cross-correlation solving mode, and the step B of phase compensation, wherein phase compensation is carried out on data according to the estimated phase drift value. In the method, only simple mathematical statistics needs to be carried out on the received data in the phase estimation step, and calculation is easy and convenient. The phase compensation step is carried out at a sending send, a receiving end only needs to send the phase shift value back to the sending end in the whole compensation process, and security of the data cannot be influenced. Phase compensation based on data levels instead of traditional hardware compensation based on signals is adopted, and a few software functions and communication interfaces can be added to a platform of a traditional quantum key distribution system to achieve the method.

Description

technical field [0001] The invention relates to computer information technology, in particular to a phase compensation method in a quantum key distribution system. Background technique [0002] Under the background of the rapid development of computer information technology, the requirements of information technology for information security are increasing day by day. In recent years, continuous variable quantum key distribution technology has attracted widespread attention, because it can not only physically guarantee the unconditional security of communication, but also has the prospect of higher communication rate and efficiency than discrete variable quantum key distribution technology. . At present, continuous variable quantum key distribution has attracted many research institutions in the world to conduct in-depth research on its theory and application technology. Continuous Variable Quantum Key Distribution (CV-QKD, Continuous Variable Quantum Key Distribution) has...

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Application Information

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IPC IPC(8): H04L9/08
Inventor 林大凯黄端刘友明黄鹏曾贵华
Owner SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD
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