Homogeneous spin-dephasing time of NV− centre in millimetre-scale 12C-enriched high-pressure high-temperature diamond crystals
Abstract Negatively charged nitrogen vacancy (NV−) centres in diamond crystals are promising colour centres for high-sensitivity quantum sensors. A long dephasing time (T 2 * > 10 μs) is essential for achieving increased sensitivity and higher uniformity of T 2 * in millimetre-scale diamond is st...
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Nature Portfolio
2025-04-01
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| Series: | Communications Materials |
| Online Access: | https://doi.org/10.1038/s43246-025-00782-7 |
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| author | Chikara Shinei Yuta Masuyama Hiroshi Abe Masashi Miyakawa Takashi Taniguchi Takeshi Ohshima Tokuyuki Teraji |
| author_facet | Chikara Shinei Yuta Masuyama Hiroshi Abe Masashi Miyakawa Takashi Taniguchi Takeshi Ohshima Tokuyuki Teraji |
| author_sort | Chikara Shinei |
| collection | DOAJ |
| description | Abstract Negatively charged nitrogen vacancy (NV−) centres in diamond crystals are promising colour centres for high-sensitivity quantum sensors. A long dephasing time (T 2 * > 10 μs) is essential for achieving increased sensitivity and higher uniformity of T 2 * in millimetre-scale diamond is strongly desired for femto-tesla weak magnetic field detection. High uniformity of T 2 * for NV− centres is achieved herein. The median value of T 2 *, <T 2 *>, in the 12C-enriched high-pressure, high-temperature (HPHT) grown diamond with a nitrogen concentration of 1.3 ± 0.4 ppm is 4.5 μs. The variance of T 2 * is only 10% over a millimetre-scale region (1.1 × 1.1 mm2) within the 0.4 mm thick {111} growth sector. <T 2 *> is ~2/3 times the value limited by the dipole-dipole interaction from the electron-spin bath of nitrogen impurities, suggesting that the residual strain gradient in the HPHT diamond crystal partially limits T 2 *. Reducing the strain gradient in diamond crystals provide a pathway to achievement of high sensitivity magnetometry using NV quantum sensing. |
| format | Article |
| id | doaj-art-a96dec6be02f4a5a8c173faadbdfa5ae |
| institution | DOAJ |
| issn | 2662-4443 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Nature Portfolio |
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| series | Communications Materials |
| spelling | doaj-art-a96dec6be02f4a5a8c173faadbdfa5ae2025-08-20T03:10:18ZengNature PortfolioCommunications Materials2662-44432025-04-01611910.1038/s43246-025-00782-7Homogeneous spin-dephasing time of NV− centre in millimetre-scale 12C-enriched high-pressure high-temperature diamond crystalsChikara Shinei0Yuta Masuyama1Hiroshi Abe2Masashi Miyakawa3Takashi Taniguchi4Takeshi Ohshima5Tokuyuki Teraji6National Institute for Materials Science, TsukubaNational Institutes for Quantum Science and Technology, TakasakiNational Institutes for Quantum Science and Technology, TakasakiNational Institute for Materials Science, TsukubaNational Institute for Materials Science, TsukubaNational Institutes for Quantum Science and Technology, TakasakiNational Institute for Materials Science, TsukubaAbstract Negatively charged nitrogen vacancy (NV−) centres in diamond crystals are promising colour centres for high-sensitivity quantum sensors. A long dephasing time (T 2 * > 10 μs) is essential for achieving increased sensitivity and higher uniformity of T 2 * in millimetre-scale diamond is strongly desired for femto-tesla weak magnetic field detection. High uniformity of T 2 * for NV− centres is achieved herein. The median value of T 2 *, <T 2 *>, in the 12C-enriched high-pressure, high-temperature (HPHT) grown diamond with a nitrogen concentration of 1.3 ± 0.4 ppm is 4.5 μs. The variance of T 2 * is only 10% over a millimetre-scale region (1.1 × 1.1 mm2) within the 0.4 mm thick {111} growth sector. <T 2 *> is ~2/3 times the value limited by the dipole-dipole interaction from the electron-spin bath of nitrogen impurities, suggesting that the residual strain gradient in the HPHT diamond crystal partially limits T 2 *. Reducing the strain gradient in diamond crystals provide a pathway to achievement of high sensitivity magnetometry using NV quantum sensing.https://doi.org/10.1038/s43246-025-00782-7 |
| spellingShingle | Chikara Shinei Yuta Masuyama Hiroshi Abe Masashi Miyakawa Takashi Taniguchi Takeshi Ohshima Tokuyuki Teraji Homogeneous spin-dephasing time of NV− centre in millimetre-scale 12C-enriched high-pressure high-temperature diamond crystals Communications Materials |
| title | Homogeneous spin-dephasing time of NV− centre in millimetre-scale 12C-enriched high-pressure high-temperature diamond crystals |
| title_full | Homogeneous spin-dephasing time of NV− centre in millimetre-scale 12C-enriched high-pressure high-temperature diamond crystals |
| title_fullStr | Homogeneous spin-dephasing time of NV− centre in millimetre-scale 12C-enriched high-pressure high-temperature diamond crystals |
| title_full_unstemmed | Homogeneous spin-dephasing time of NV− centre in millimetre-scale 12C-enriched high-pressure high-temperature diamond crystals |
| title_short | Homogeneous spin-dephasing time of NV− centre in millimetre-scale 12C-enriched high-pressure high-temperature diamond crystals |
| title_sort | homogeneous spin dephasing time of nv centre in millimetre scale 12c enriched high pressure high temperature diamond crystals |
| url | https://doi.org/10.1038/s43246-025-00782-7 |
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