Phase compensation method of quantum key distribution system

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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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 will basically not work

At the same time, the feedback phase compensation scheme needs to compensate the estimated phase to the phase modulator at the receiving end in real time, which not only increases the hardware complexity and cost of the system, but also makes it easier to introduce additional noise

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