Defects with associated electron and nuclear spins in solid-state materials have a long history relevant to quantum information science that goes back to the first spin echo experiments with silicon dopants in the 1950s. Since the turn of the century, the field has rapidly spread to a vast array of defects and host crystals applicable to quantum communication, sensing and computing. From simple spin resonance to long-distance remote entanglement, the complexity of working with spin defects is fast increasing, and requires an in-depth understanding of the defects’ spin, optical, charge and material properties in this modern context. This is especially critical for discovering new relevant systems for specific quantum applications. In this Review, we expand upon all the key components of solid-state spin defects, with an emphasis on the properties of defects and of the host material, on engineering opportunities and on other pathways for improvement. This Review aims to be as defect and material agnostic as possible, with some emphasis on optical emitters, providing broad guidelines for the field of solid-state spin defects for quantum information.
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We thank Jaewook Lee and Huijin Park for their help in cross-checking the CCE predictions, Hideo Ohno, Tomasz Dietl, Fumihiro Matsukura and Shunsuke Fukami for fruitful discussion, and Michael Solomon and Grant Smith for reviewing the manuscript. This work was primarily supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (G.W., F.J.H., C.P.A. and D.D.A.). H.S. was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (nos. 2018R1C1B6008980, 2018R1A4A1024157 and 2019M3E4A1078666). G.G. was supported by AFOSR FA9550-19-1-0358. S.K. was supported by Marubun Research Promotion Foundation, RIEC through Overseas Training Program for Young Profession and Cooperative Research Projects, MEXT through the Program for Promoting the Enhancement of Research Universities and JSPS Kakenhi nos. 19KK0130 and 20H02178. A.G. was supported by the Hungarian NKFIH grant no. KKP129866 of the National Excellence Program of Quantum-coherent materials project, no. 2017-1.2.1-NKP-2017-00001 of the National Quantum Technology Program, no. 127902 of the EU QuantERA Nanospin project, no. 127889 of the EU QuantERA Q_magine project and by the European Commission of EU H2020 Quantum Technology Flagship project ASTERIQS (grant no. 820394), as well as the EU H2020 FETOPEN project QuanTELCO (grant no. 862721).
The authors declare no competing interests.
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Wolfowicz, G., Heremans, F.J., Anderson, C.P. et al. Quantum guidelines for solid-state spin defects. Nat Rev Mater 6, 906–925 (2021). https://doi.org/10.1038/s41578-021-00306-y
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