High Q‑Factor Diamond Optomechanical Resonators with Silicon Vacancy Centers at Millikelvin Temperatures

• Published in: Nano letters 2024-05, Vol.24 (23), p.6831-6837
• Main Authors: Joe, Graham, Chia, Cleaven, Pingault, Benjamin, Haas, Michael, Chalupnik, Michelle, Cornell, Eliza, Kuruma, Kazuhiro, Machielse, Bartholomeus, Sinclair, Neil, Meesala, Srujan, Lončar, Marko
• Format: Article
• Language: English
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/acs.nanolett.3c04953

Phonons are envisioned as coherent intermediaries between different types of quantum systems. Engineered nanoscale devices, such as optomechanical crystals (OMCs), provide a platform to utilize phonons as quantum information carriers. Here we demonstrate OMCs in diamond designed for strong for interactions between phonons and a silicon vacancy (SiV) spin. Using optical measurements at millikelvin temperatures, we measure a line width of 13 kHz (Q-factor of ∼4.4 × 105) for a 6 GHz acoustic mode, a record for diamond in the GHz frequency range and within an order of magnitude of state-of-the-art line widths for OMCs in silicon. We investigate SiV optical and spin properties in these devices and outline a path toward a coherent spin–phonon interface.