{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:32:44Z","timestamp":1760059964860,"version":"build-2065373602"},"reference-count":46,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2025,7,21]],"date-time":"2025-07-21T00:00:00Z","timestamp":1753056000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Scientific Research Fund of Hunan Provincial","award":["2024JJ7489","HNJG-20231037","23C0273","2023ZD0075"],"award-info":[{"award-number":["2024JJ7489","HNJG-20231037","23C0273","2023ZD0075"]}]},{"name":"Teaching Reform Research Project of Ordinary Higher Education Institutions in Hunan Province","award":["2024JJ7489","HNJG-20231037","23C0273","2023ZD0075"],"award-info":[{"award-number":["2024JJ7489","HNJG-20231037","23C0273","2023ZD0075"]}]},{"name":"Research project of Hunan Provincial Department of Education","award":["2024JJ7489","HNJG-20231037","23C0273","2023ZD0075"],"award-info":[{"award-number":["2024JJ7489","HNJG-20231037","23C0273","2023ZD0075"]}]},{"name":"science and technology innovation guiding project of Shaoyang City","award":["2024JJ7489","HNJG-20231037","23C0273","2023ZD0075"],"award-info":[{"award-number":["2024JJ7489","HNJG-20231037","23C0273","2023ZD0075"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>We provide an approach to detect a nitrogen-vacancy (NV) center, which might be a defect in a diamond nanomembrane, using a dual-coupling optomechanical system. The NV center modifies the energy-level structure of a dual-coupling optomechanical system through dressed states arising from its interaction with the mechanical membrane. Thus, we study the photon blockade in the cavity of a dual-coupling optomechanical system in which an NV center is embedded in a single-crystal diamond nanomembrane. The NV center significantly influences the statistical properties of the cavity field. We systematically investigate how three key NV center parameters affect photon blockade: (i) its coupling strength to the mechanical membrane, (ii) transition frequency, and (iii) decay rate. We find that the NV center can shift, give rise to a new dip, and even suppress the original dip in a bare quadratic optomechanical system. In addition, we can amplify the effect of the NV center on photon statistics by adding a gravitational potential when the NV center has little effect on photon blockade. Therefore, our study provides a method to detect diamond nanomembrane defects in a dual-coupling optomechanical system.<\/jats:p>","DOI":"10.3390\/sym17071166","type":"journal-article","created":{"date-parts":[[2025,7,21]],"date-time":"2025-07-21T13:59:11Z","timestamp":1753106351000},"page":"1166","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Detection of a Defect in a Dual-Coupling Optomechanical System"],"prefix":"10.3390","volume":"17","author":[{"given":"Zhen","family":"Li","sequence":"first","affiliation":[{"name":"Department of Physics, Shaoyang University, Shaoyang 422099, China"}]},{"given":"Ya-Feng","family":"Jiao","sequence":"additional","affiliation":[{"name":"School of Electronics and Information, Zhengzhou University of Light Industry, Zhengzhou 450001, China"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Seaton, M.J. 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