A Highly Sensitive Diamond NV Magnetometer Using Ramsey Interferometry with a Short Sensor-to-Sample Distance
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915862370320384 |
|---|---|
| author | Araki, Yuta Sekiguchi, Takeharu Hatano, Yuji Sekiguchi, Naota Shinei, Chikara Miyakawa, Masashi Taniguchi, Takashi Teraji, Tokuyuki Abe, Hiroshi Onoda, Shinobu Ohshima, Takeshi Shibata, Takayuki Hatano, Mutsuko Iwasaki, Takayuki |
| author_facet | Araki, Yuta Sekiguchi, Takeharu Hatano, Yuji Sekiguchi, Naota Shinei, Chikara Miyakawa, Masashi Taniguchi, Takashi Teraji, Tokuyuki Abe, Hiroshi Onoda, Shinobu Ohshima, Takeshi Shibata, Takayuki Hatano, Mutsuko Iwasaki, Takayuki |
| contents | In this study, we developed a diamond quantum magnetometer based on Ramsey interferometry with a short sensor-to-sample distance. Conventional biomagnetic sensors with ensemble nitrogen-vacancy centers using continuous-wave optically detected magnetic resonance and Ramsey methods typically rely on watt-level lasers to achieve high sensitivity, resulting in thermal issues. In contrast, by employing the light-trapping diamond waveguide technique in a high-pressure and high-temperature diamond sample treated with electron beam irradiation, we obtained a high photon conversion efficiency of 9.5%, enabling us to simultaneously achieve a high sensitivity of 2.93(7) pT/Hz^1/2 in the 100-400 Hz frequency range and a minimal temperature increase of only approximately 13 K at a low laser power of 210 mW. Using a dry phantom designed to mimic magnetoencephalography signals, we measured a weak magnetic field of 77.7(2) pT without signal averaging at a sensor-to-sample distance of 2.5 mm. This short-distance measurement prevents severe spatial signal attenuation, yielding a high signal-to-noise ratio. The development here is crucial for practical biomagnetic applications based on Ramsey interferometry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_13754 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Highly Sensitive Diamond NV Magnetometer Using Ramsey Interferometry with a Short Sensor-to-Sample Distance Araki, Yuta Sekiguchi, Takeharu Hatano, Yuji Sekiguchi, Naota Shinei, Chikara Miyakawa, Masashi Taniguchi, Takashi Teraji, Tokuyuki Abe, Hiroshi Onoda, Shinobu Ohshima, Takeshi Shibata, Takayuki Hatano, Mutsuko Iwasaki, Takayuki Quantum Physics In this study, we developed a diamond quantum magnetometer based on Ramsey interferometry with a short sensor-to-sample distance. Conventional biomagnetic sensors with ensemble nitrogen-vacancy centers using continuous-wave optically detected magnetic resonance and Ramsey methods typically rely on watt-level lasers to achieve high sensitivity, resulting in thermal issues. In contrast, by employing the light-trapping diamond waveguide technique in a high-pressure and high-temperature diamond sample treated with electron beam irradiation, we obtained a high photon conversion efficiency of 9.5%, enabling us to simultaneously achieve a high sensitivity of 2.93(7) pT/Hz^1/2 in the 100-400 Hz frequency range and a minimal temperature increase of only approximately 13 K at a low laser power of 210 mW. Using a dry phantom designed to mimic magnetoencephalography signals, we measured a weak magnetic field of 77.7(2) pT without signal averaging at a sensor-to-sample distance of 2.5 mm. This short-distance measurement prevents severe spatial signal attenuation, yielding a high signal-to-noise ratio. The development here is crucial for practical biomagnetic applications based on Ramsey interferometry. |
| title | A Highly Sensitive Diamond NV Magnetometer Using Ramsey Interferometry with a Short Sensor-to-Sample Distance |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.13754 |