Pulse generator applied to distributing continuous variable quantum secret keys

Abstract

The invention provides a pulse generator applied to distributing continuous variable quantum secret keys. The pulse generator comprises a digital circuit (1) and an analog circuit (2). The digital circuit (1) comprises a first programmable pulse width modulation chip (3) and a first programmable delay wire chip (5), a second programmable pulse width modulation chip (4) and a second programmable delay wire chip (6). The analog circuit (2) comprises a first power amplifying circuit (7) and a second power amplifying circuit (8). An externally input clock signal triggers the digital circuit (1) to generate two pulses of which the pulse and time delay can be accurately adjusted, and the two pulses are output through first power amplifying circuit (7) and the second power amplifying circuit (8) in the simulation circuit (2) respectively. The pulse generator has the advantages of being capable of accurately adjusting the pulse width, high in time delay accuracy, short in control time, high in driving capacity, small in size, low in cost and the like, and the pulse generator can be integrated in a system for distributing the continuous variable quantum secret keys very well.

Description

technical field [0001] The invention relates to a pulse generator, in particular to a pulse generator suitable for continuous variable quantum key distribution, in particular to a dual-channel pulse used to drive a Mach-Zehnder lithium niobate intensity modulator to generate high extinction ratio pulse light Generators can be well integrated in continuous variable quantum key distribution systems. Background technique [0002] Quantum communication based on the basic principles of quantum mechanics has unconditional security, and has very broad application prospects in the fields of national defense, commerce, and networks. Quantum key distribution is a direction closest to practical application in this field. According to whether the physical quantity used for encoding is the separated spectrum or the continuous spectrum of the light field, it can be divided into two directions: separated variables and continuous variables. Continuous variable quantum key distribution does...

AI Technical Summary

Problems solved by technology

The existing high-performance commercial dual-channel pulse generator can realize this function, but it is large in size and expensive (tens of thousands of yuan), and it also needs a dedicated communication interface (USB, GPIB, etc.) to adjust parameters, which takes a long time to control and cannot Well integrated in quantum key distribution systems

If FPGA development is used, not only the development cycle is long and difficult, but also due to the limitation of the clock frequency (hundreds of megahertz), the generated pulses do not have sufficient pulse width accuracy

Development with the current multi-function data acquisition card also faces problems such as high cost, limited clock accuracy, and limited output power.

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