Control method and system of single photon detector death time

Abstract

The invention discloses a method for controlling the death time of a single-photon detector, which is characterized in that it comprises the following steps: obtaining a single-photon detection signal; rewriting a register and obtaining a corresponding resistance value; the resistance value and the capacitance jointly determine the death time According to the invention, the value of the dead time of the single photon detector in the quantum key distribution system can be adjusted conveniently, and the stability is better.

Description

【Technical field】 [0001] The invention relates to the field of communication, in particular to quantum communication. 【Background technique】 [0002] In recent years, due to the frequent occurrence of information leakage, eavesdropping and other incidents, information security has received widespread attention. More and more enterprises and institutions have strengthened security protection in information transmission and communication, and many information encryption and secure communication methods , Quantum encryption communication is regarded as one of the safest encrypted communication methods at present. [0003] In quantum communication technology, single photon detector is the key device in the whole quantum key communication equipment. The performance of the single photon detector directly determines the security and key generation rate of the quantum key distribution system. The quantum key distribution system mainly realizes the safe generation of keys through q...

AI Technical Summary

Problems solved by technology

But there will be a problem in the dead time control circuit. When the efficiency value and dark count value of the single photon detector need to be adjusted, it is often necessary to adjust the value of R in the RC circuit (keep the capacitance of the capacitor unchanged). When adjusting a suitable When the value of the dead time is large, the resistance needs to be replaced continuously

The most difficult problem is: when the entire quantum key distribution device has been assembled, it is necessary to open the device when adjusting the resistance of the dead time circuit RC, which increases the workload

However, there are also disadvantages in the use of potentiometers: first, the potentiometer will deviate from the original set value under the condition of handling and vibration (the main reason is that the knob of the potentiometer is easy to slide), causing the dead time to deviate from the set value, Thus affecting the performance of single photon detectors

At the same time, the system must also open the device when adjusting the value of the dead time, which is very troublesome and requires a large workload

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