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At present, solid-state atomic defects are leading candidates because of their inherent spin and optical coherence\n                    <jats:sup>1,2<\/jats:sup>\n                    . Building on these advancements, synthetically tailored molecular systems represent a fundamental change in the field, using precise atomic control and consistent bottom-up assembly\n                    <jats:sup>3,4<\/jats:sup>\n                    . However, a molecular platform that concurrently satisfies the demands of a robust spin\u2013photon interface\u2014namely, the combination of bright fluorescence, high spectral stability and long ground-state spin lifetimes\u2014has yet to be realized at the single-molecule level. Here we show that a triplet ground-state carbene molecule, embedded within a structurally matched host crystal, functions as a robust spin\u2013photon interface with single-molecule addressability. The system exhibits narrow ZPLs, spectral stability over more than an hour, spin-selective optical transitions and single-molecule optically detected magnetic resonance. Coherent control yields millisecond-scale dynamical-decoupling coherence and tens-of-milliseconds spin relaxation at a temperature of 4.5\u2009K. These results establish molecular qubits as a viable platform for single-emitter quantum optics\n                    <jats:sup>5,6<\/jats:sup>\n                    while preserving the advantages of bottom-up chemical design\n                    <jats:sup>7<\/jats:sup>\n                    and processable materials\n                    <jats:sup>8\u201310<\/jats:sup>\n                    .\n                  <\/jats:p>","DOI":"10.1038\/s41586-026-11147-6","type":"journal-article","created":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T16:01:57Z","timestamp":1793203317000},"page":"1153-1159","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A single-molecule spin\u2013photon interface"],"prefix":"10.1038","volume":"658","author":[{"given":"Simon","family":"Roggors","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Unden","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Aubele","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"Mentzel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gregor","family":"Bayer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9111-2400","authenticated-orcid":false,"given":"Alon","family":"Salhov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jochen","family":"Scharpf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4238-8843","authenticated-orcid":false,"given":"Martin B.","family":"Plenio","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7291-7120","authenticated-orcid":false,"given":"Alex","family":"Retzker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fedor","family":"Jelezko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tim R.","family":"Eichhorn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobias A.","family":"Schaub","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3934-8306","authenticated-orcid":false,"given":"Matthias","family":"Pfender","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Neumann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ilai","family":"Schwartz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,28]]},"reference":[{"key":"11147_CR1","doi-asserted-by":"publisher","first-page":"516","DOI":"10.1038\/s41566-018-0232-2","volume":"12","author":"DD Awschalom","year":"2018","unstructured":"Awschalom, D. 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