Presentation Information
[10a-PA6-3]Real-Time NV Center Quantum Measurement System Using FPGA Photon Counting and GPU Maximum Likelihood Estimation
〇(DC)Shuntaro Usui1, Yuka Kobayashi1, Takashi Tanii1 (1.Waseda Univ.)
Keywords:
NV center,Maximum likelihood estimation
Nitrogen-vacancy (NV) centers in diamond are promising solid-state quantum sensors for nanoscale measurements of magnetic fields, temperature, and spin environments. However, pulsed measurements of single NV centers require many repetitions and long signal accumulation, during which photon count rate, focus position, fluorescence intensity, and readout contrast may slowly vary. In this work, we constructed a real-time NV center quantum measurement system based on FPGA photon counting and GPU maximum-likelihood estimation (MLE). TTL pulses from a single-photon detector are counted by an FPGA in readout windows synchronized with pulse sequences, and the acquired photon-counting data are transferred to GPU-based MLE analysis. The system was evaluated using Rabi and Ramsey measurements, demonstrating continuous data handling from photon counting to likelihood calculation.