Development Of High-speed Electronics Equipment In Quantum Control Experiment

High-speed electronics equipment has an irreplaceable role in industry and scientific research.High-speed devices based on Field Programmable Gate Array(FPGA)are gradually adopted by all walks of life because of their programmability,flexibility,and low cost.Especially in the field of quantum physics,because of its high cost performance and strong reconfigurability,relevant research groups adopt FPGA-based high-speed electronics equipment to meet the high-speed experimental needs in quantum control experiments.In this dissertation,we developed a pulse generator with high resolution based on FPGA and a photonic time-of-flight recorder according to the needs of quantum control experiments.The profile of the pulse signals required by the pulse generator is encoded by the PC,and then packaged and sent to the FPGA.The final encoded data is a data packet with a total size of 1024 Bytes in units of 128 bit.After received on the FPGA side,the data is first stored in DDR3 SDRAM,waiting for the PC side to complete the decoding and output of data.In this dissertation,through the high-speed parallel-to-serial design,the entire system can output pulse signals with high resolution on the basis of meeting the timing requirements.The design of the photonic time-of-flight recorder is divided into signal acquisition on the hardware side and data processing on the software side.The signal acquisition design on the hardware side separates the counting from the acquisition operation.The counting operation completes the synchronous counting based on the start signal.The acquisition operation records the signal arrival time by using the photon signal as the acquisition clock.The software side extracts the read data for subsequent experiments.This design can retain the timing information of the photon signal and improve the resolution of the acquisition.In order to be compatible with more experimental requirements,we also finished some research on the pulse generator with ultra-high resolution.We combine clock-based and delay chain-based pulse generation schemes.Through the comparison of schemes,manual placement and routing,etc.,the signal achieves higher resolution while ensuring quality.All designs in this dissertation are based on Xilinx FPGA chips,equipped with DDR3 SDRAM chips for high-speed data transmission,while increasing storage space.The PC side uses Python2.7 version as the software operating environment,Vivado2016.3 as the hardware development platform,and the verilog hardware description language as design language.A programmable pulse generator with 24 channels and a photonic time-of-flight recorder with resolution of 2ns are designed.According to the results of electrical test and quantum control experimental data,the performance of the two has reached the expected index:(1)The resolution of the pulse generator is 1ns,and the minimum pulse width is 1ns.Meanwhile each channel does not affect each other,and can work independently and steadily;(2)The resolution of the photonic time-of-flight recorder is 2ns.The photon spectrum curve of NV centers obtained after the collection and processing of photon signals is smooth,which indicates its working performance is good.Finally,the ultra-high resolution pulse generator researched in this dissertation has achieved a resolution of 71 ps through electrical testing.Meanwhile,the linear fit of the measured data is very high under source signal with different pulse width.This technology provides strong proof of principle for related research in future.