High Q-Factor Diamond Optomechanical Resonators with Silicon Vacancy Centers at Millikelvin Temperatures
Graham Joe (Harvard School of Engineering and Applied Sciences)
Cleaven Chia (Harvard School of Engineering and Applied Sciences, A*STAR Computational Resource Centre (A*CRC))
Benjamin Pingault (Harvard School of Engineering and Applied Sciences, TU Delft - QID/Taminiau Lab, TU Delft - QuTech Advanced Research Centre, Argonne National Laboratory)
Michael Haas (Harvard School of Engineering and Applied Sciences)
Michelle Chalupnik (Harvard School of Engineering and Applied Sciences)
Eliza Cornell (Harvard School of Engineering and Applied Sciences)
Kazuhiro Kuruma (Harvard School of Engineering and Applied Sciences)
Bartholomeus Machielse (Harvard University)
Neil Sinclair (Harvard School of Engineering and Applied Sciences)
Srujan Meesala (California Institute of Technology)
Marko Lončar (Harvard School of Engineering and Applied Sciences)
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Abstract
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.