1-milligram torsional pendulum for experiments at the quantum-gravity interface

• URL: http://arxiv.org/abs/2408.09445v3
• Date: Sat, 19 Apr 2025 09:37:42 GMT
• Title: 1-milligram torsional pendulum for experiments at the quantum-gravity interface
• Authors: Sofia Agafonova, Pere Rossello, Manuel Mekonnen, Onur Hosten,
• Abstract summary: We present a 1-milligram torsional pendulum operating at 18 Hz.<n>We demonstrate laser cooling its motion from room temperature to 240microkelvins, surpassing by over 20-fold the coldest motions.<n>The cooling boosts the pendulum's feeble quantum coherence length, achieving the highest quantum-gravity figure-of-merit benchmarked for a table-top experiment.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Probing the possibility of entanglement generation through gravity offers a path to tackle the question of whether gravitational fields possess a quantum mechanical nature. A potential realization necessitates systems with low-frequency dynamics at an optimal mass scale, for which the microgram-to-milligram range is a strong contender. Here, after refining a figure-of-merit for the problem, we present a 1-milligram torsional pendulum operating at 18 Hz. We demonstrate laser cooling its motion from room temperature to 240~microkelvins, surpassing by over 20-fold the coldest motions attained for oscillators ranging from micrograms to kilograms. The cooling boosts the pendulum's feeble quantum coherence length, achieving the highest quantum-gravity figure-of-merit benchmarked for a table-top experiment, ranking second only to LIGO. The current approach shows a large improvement potential compared to many systems, positioning milligram-scale torsional pendulums as a prominent platform to pursue for exploring quantum aspects of gravity.

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