Exploring the quantum nature of gravity requires systems that balance quantum control and gravitational interaction, most plausibly within the microgram-to-milligram mass range. Here, the authors develop a 1-milligram torsional pendulum operating at 18 Hz, achieving unprecedented cooling to 240 microkelvins, positioning it as a promising platform toward probing quantum gravity interactions.
- Sofia Agafonova
- Pere Rosselló
- Onur Hosten
