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量子实验控制单元可有效提高量子实验效率、增强结果准确性,以往设计出的量子实验控制单元均存在一些缺陷。针对该种现象,通过分析量子实验控制单元设计需求,设计出基于FPGA的量子实验控制单元。在温度控制中,FPGA使用比例、积分组合运算方式,将控制单元中热能转换器电流大小和流通方向的控制误差限制在0.4℃以下,使量子通信时间精度高于3.5ns。在激光脉冲控制中,FPGA控制激光发生器间歇给出等周期脉冲信号,并对脉冲信号进行集成输出,保证脉冲信号的通信同步性,缩减量子通信时延。为了避免FPGA数据误码影响控制工作,设计FPGA数据接收的逻辑结构,进一步增强了控制效果。实验结果显示,所设计的控制单元拥有优异的温度控制效果和激光脉冲控制效果。
The quantum experiment control unit can effectively improve the quantum experiment efficiency and enhance the accuracy of the result. There are some defects in the quantum experiment control unit designed in the past. In view of this kind of phenomenon, we design a quantum experiment control unit based on FPGA by analyzing the design requirements of quantum experiment control unit. In the temperature control, FPGA uses proportional and integral combination of the operation mode, the control unit of the thermal converter current size and direction of the control error is limited to below 0.4 ℃, the quantum communication time accuracy higher than 3.5ns. In laser pulse control, FPGA control laser generator intermittently gives equal-period pulse signal, and integrates pulse signal output to ensure synchronization of pulse signal communication and reduce quantum communication delay. In order to avoid the error control of FPGA data, the design of the logic structure of FPGA data reception further enhances the control effect. The experimental results show that the designed control unit has excellent temperature control effect and laser pulse control effect.