Frequency-tunable magnetic field sensing using continuous-wave optically detected magnetic resonance with nitrogen-vacancy centers in diamond

• URL: http://arxiv.org/abs/2305.12141v1
• Date: Sat, 20 May 2023 08:48:46 GMT
• Title: Frequency-tunable magnetic field sensing using continuous-wave optically detected magnetic resonance with nitrogen-vacancy centers in diamond
• Authors: Ryusei Okaniwa, Takumi Mikawa, Yuichiro Matsuzaki, Tatsuma Yamaguchi, Rui Suzuki, Norio Tokuda, Hideyuki Watanabe, Norikazu Mizuochi, Kento Sasaki, Kensuke Kobayashi, and Junko Ishi-Hayase
• Abstract summary: We propose and demonstrate frequency-tunable magnetic field sensing based on CW-ODMR. The sensitivity of our method is estimated to be comparable to or even higher than that of the conventional method. Our frequency-tunable magnetic field sensor based on CW-ODMR paves the way for new applications in diamond devices.
• Score: 0.15274583259797847
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The nitrogen-vacancy (NV) center is a promising candidate to realize practical quantum sensors with high sensitivity and high spatial resolution, even at room temperature and atmospheric pressure. In conventional high-frequency AC magnetometry with NV centers, the setup requires a pulse sequence with an appropriate time synchronization and strong microwave power. To avoid these practical difficulties, AC magnetic field sensing using continuous-wave opticallydetected magnetic resonance (CW-ODMR) was recently demonstrated. That previous study utilized radio frequency (RF) dressed states generated by the coherent interaction between the electron spin of the NV center and the RF wave. However, the drawback of this method is that the detectable frequency of the AC magnetic fields is fixed. Here, we propose and demonstrate frequency-tunable magnetic field sensing based on CW-ODMR. In the new sensing scheme, we obtain RF double-dressed states by irradiation with a RF field at two different frequencies. One creates the RF dressed states and changes the frequency of the target AC field. The other is a target AC field that induces a change in the CW-ODMR spectrum by generating the RF double-dressed states through coherent interaction with the RF dressed states. The sensitivity of our method is estimated to be comparable to or even higher than that of the conventional method based on a RF field with a single frequency. The estimated bandwidth is 7.45 MHz, higher than that of the conventional method using the RF dressed states. Our frequency-tunable magnetic field sensor based on CW-ODMR paves the way for new applications in diamond devices.

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