Design of NV color center fluorescence signal acquisition circuit based on FPGA architecture

Nitrogen-vacancy (NV) quantum defects in diamond are sensitive detectors of magnetic fields. The rapid development of NV-center magnetic sensor has higher requirements for high-speed and high-precision data acquisition, weak signal detection and display. However, the existing sensing technologies based on diamond NV centers rely on bulky and expensive instruments, which must be replaced by a more compact design. Here we combine NV quantum sensing technology with integrated circuit technology to create a compact and easy-to-operate platform, which includes microwave source module, transistor-transistor logic (TTL) modulation module, digital lock-in amplifier (DLIA) module, etc. In order to confirm the reliability of the experimental platform, we not only tested the performance of each individual module, but also carried out optical detection magnetic resonance (ODMR) experiments. With this platform, we can obtain a magnetic sensitivity of 465 nT/Hz^1/2. This experimental platform with convenient operation and low noise has the potential to become an independent magnetic measuring instrument.