Software Design And Simulation Of Temperature Control System For Quantum Entanglement Source In Optical Communication Band

In the field of quantum information,high-performance quantum entanglement source has the characteristics of unconditional security,strong anti-extra noise ability,and effectively improve transmission distance and channel capacity.It is one of the key components to realize quantum communication,quantum computing and quantum precision measurement.One of the preparation methods is the Optical Parametric oscillation(OPO),which is used to construct the quantum entanglement source.The temperature stability of nonlinear optical crystals is one of the most important factors affecting the stability of the system.Because the nonlinear crystal will absorb part of the laser energy and heat,resulting in the instability of crystal temperature and the change of crystal refractive index,it is necessary to use the temperature control system for constant temperature control of crystal temperature.However,when the control precision and stability of the temperature control system are not high enough,it will affect the nonlinear crystal to meet the phase matching conditions,thus reducing the performance of the entangled source system.Therefore,it is very important to design a high stability and high precision temperature control system for quantum entanglement source.The temperature control system of quantum entanglement source developed in this paper consists of hardware,algorithm and software.The core microcontroller of the system adopts STM32F407 Vex chip,which has the characteristics of low power consumption,high efficiency and high cost performance.The whole temperature control system mainly includes six parts: temperature acquisition,microcontroller,temperature control,data communication,controlled object and upper computer.The temperature of nonlinear optical crystals is characterized by time delay and nonlinearity.Genetic Fuzzy Immune Proportional Integral Differential(GFI-PID)control algorithm is proposed in this paper.It combines Proportional Integral Differential(PID)with Fuzzy Algorithm(FA),immune feedback mechanism and Genetic Algorithm(GA).The PID parameters can be set online to overcome the problems of large overshoot and slow response caused by improper selection of immune parameters.Matlab software is used to simulate the algorithm.The simulation results show that compared with PID algorithm and Fuzzy Immune Proportional Differential Integral(FI-PID)algorithm,The overshoot of the system was reduced by 6.8% and 1.8% respectively,and the rise time was reduced by 5%and 3% respectively.This method reduces the overshoot of the system,improves the convergence speed and responsiveness of the system,and makes the temperature control system have strong self-tuning function and advanced adaptive ability,and can better control the working temperature of the nonlinear optical crystal in the quantum entanglement system.With the progress of technology,remote monitoring has been widely used in various industries.In order to realize the remote human-computer interaction function of the temperature control system of quantum entanglement source,the system also includes the upper computer interface developed based on Qt.RS232 serial communication is selected for the communication between the upper computer and the lower computer,and the running data is stored using My SQL database.The main function of the upper computer is to display the working state of the system,the current temperature,the temperature time curve and so on in real time through the friendly interface.At the same time,it also has the function of setting the temperature value.This design also provides a new idea for the innovation of other systems.