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Synchronous method of quantum key distribution system

A technology of quantum key distribution and synchronizing light, which is applied in the synchronization field of quantum key distribution system, can solve the problems such as the limitation of rate increase, restrict the operating frequency of QKD system, etc., and achieve the effect of improving the bit rate

Inactive Publication Date: 2015-03-25
QUANTUMCTEK
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Problems solved by technology

[0006] In addition, since the synchronous light and the signal light have the same frequency, if the coding rate of the QKD system is increased by increasing the transmission rate of the signal light, the rate increase will be limited due to the increased influence of the synchronous light on the signal light. Thereby restricting the improvement of the operating frequency of the QKD system

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  • Synchronous method of quantum key distribution system

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] figure 1 It is a schematic diagram of the synchronization method of the quantum key distribution system of the present invention. Taking the 100kHz synchronization signal and the 20MHz signal light as an example, the specific working steps of the present invention are as follows:

[0024] 1. The sender sends 100kHz synchronous light and 20MHz signal light, both of which are transmitted in the same optical fiber;

[0025] 2. Synchronous light generates 100kHz synchronous electrical signal after photoelectric conversion (in this embodiment, photoelectric tube);

[0026] 3. The 100kHz synchronous electrical signal is multiplied to a 20MHz synchronous electrical signal by a low-jitter frequency multiplier (in this embodiment, a phase-locked loop), and then output through a delay module as the gating signal of the receiver's single photon detector;

[0027] 4. Th...

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Abstract

The invention belongs to the field of quantum secret communication technologies and particularly relates to a synchronous method of a quantum key distribution system. The synchronous method comprises the following steps that a sender sends synchronous light and signal light, the frequency of the synchronous light is far smaller than that of the signal light, two frequencies have multiplied relationship, and the synchronous light and the signal light are both transmitted in one optical fiber; the synchronous light is converted to a synchronous electric signal, frequency multiplication is carried out on the synchronous electric signal to obtain the frequency which is the same as the signal light, and the synchronous electric signal is output through a delay module as a gate control signal of a photon detector of a receiver; the signal light enters the photon detector of the receiver and is detected in the valid time of the gate control signal of the detector; and the synchronous electric signal output through the delay module and the output signal of the photon detector of the receiver enter a data processing module of the receiver to carry out follow-up processing. According to the synchronous method, the influence of the synchronous light on the signal light can be reduced, the normal gate control signal of the detector is guaranteed and the code rate of the QKD (Quantum Key Distribution) system can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of quantum secret communication, and in particular relates to a synchronization method of a quantum key distribution system. Background technique [0002] Quantum communication is currently recognized as a theoretically unconditionally secure communication method and has great application prospects. However, the low coding rate of quantum keys is an important factor restricting the application of quantum communication. Therefore, it is necessary to find ways to increase the coding rate. Generally, there are two methods: increasing the operating frequency of the quantum key distribution (QKD) system, and improving the detection efficiency of the single photon detector. Under the existing detection conditions, to increase the operating frequency of the QKD system requires the support of a corresponding synchronization system. [0003] The function of the synchronization system is to enable one-to-one correspo...

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Application Information

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IPC IPC(8): H04L9/08H04L7/033
Inventor 不公告发明人
Owner QUANTUMCTEK
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