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About this paper
Hilel Hagai Diamandi, Yizhi Luo, David Mason, Tevfik Bulent Kanmaz, Sayan Ghosh, Margaret Pavlovich, Taekwan Yoon, Ryan Behunin and 3 more
Researchers demonstrated ground-state cooling of acoustic phonons in a 7.5 microgram mechanical system using microfabricated high-overtone bulk acoustic wave resonators (μHBARs). This achievement marks the most massive object ever cooled to its quantum ground state and paves the way for robust quantum technologies that require both quantum coherence and environmental resilience.
Key insights
- Microfabricated high-overtone bulk acoustic wave resonators (μHBARs) enable optomechanical coupling through Brillouin scattering with high efficiency.
- The system exhibits unity cooperativity at optical powers as low as 11 μW, facilitating quantum control without significant optical absorption or parasitic heating.
- Acoustic phonon modes in μHBARs achieve quality factors exceeding 21 million at 12.66 GHz, resulting in millisecond-scale coherence times.
Summary by alphaXiv.
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