Research Of Data Acquisition And Control Platform For Multi-photon Entanglement Experiment And Experiment Of Quantum Memory With Clod Atoms

Multi-photon entanglement experiments and quantum memory experiments on cold atoms are two advanced experiments of quantum information. Multi-photon entanglement is one key source for the area of cluster state quantum computation, and advanced quantum communication. Quantum memory experiments on cold atoms is important to long distance quantum communication, quantum repeater based quantum computation and large scale liner optical quantum computation.Based on multi-photon entanglement experiment and quantum memory experiment, a configurable data acquisition and control platform is demonstrated. Considered the requirement on electronic system from the two experiments, the platform fulfils the need of large signal channel number from Multi-photon entanglement experiment, and the need of on time data acquisition and system control from quantum memory experiment.The Platform using backpalne and plugin modules is constructed following Eurocard mechanical standard, which makes good reliability and reliability. Up to 64 star connections are placed on the backplane to satisfy the increasing need of photo signal channels in Multi-photon entanglement experiment. The front-end card of signal acquisition module which has a dynamical adjusted threshold can collect signal from photo detector. The front-end card of analog module whose output frequency and waveform can be configured is used to modulate laser and magnetic field in quantum memory experiment.In the multi-photon entanglement experiment, a high performance multi-channel coincidence counter is realized based on the configurable data acquisition and control platform. The coincidence counter has 48 channels, which is much more than any coincidence counter showed by other paper. Signal pulse which is produced in FPGA with monostable method using location constrain, has a narrower and more stable coincidence window width. The alignment of 48 channel signals is achieved by dynamic pin delay and dynamic clock phase shift.In the quantum memory experiment on cold atoms, an experiment control system is realized based on the configurable data acquisition and control platform. The system can sand up to 48 channels sequential signal and collect up to 16 channels logic signal, which is necessary for controlling a number of laser driver in the experiment. At the same time, up to 16 channels of arbitrary analog signal is produced for controlling AOM and magnetic field.The innovations of this paper are as follows:(1) An expandable and configurable electronic data acquisition and control platform is completed.(2) A FPGA based multi-channel photo coincidence counter is achieved, which has 48 coincidence channel with 2.5 ns coincidence window width. Dynamic signal delay adjusting is used making signal delays between 48 channels less than 300ps. Dynamic clock phase shifting is used to collect photon signal, which solved the problem of signal collection for system with many narrow signals.(3)The data acquisition and control platform, used in the multi-photon entanglement experiment and quantum memory experiment on cold atoms, fulfils the needs to electronics from the two experiments.