2026/07/15 by Atkin D. Hyatt, Mitul Dey Chowdhury, Mahir Chowdhury +2
#quant-ph #cond-mat.mes-hall #physics.app-ph #physics.ins-det #physics.optics
Strained membrane resonators have emerged as a promising platform for optomechanical accelerometry; however, the desired combination of low frequency and high Q-mass product requires a rethinking of their dissipation dilution engineering. Applying Bayesian optimization to a Si3N4 membrane, we discover a class of sail-like trampoline resonators in which the frequency is decreased by an order of magnitude while preserving the Q-mass product. We demonstrate centimeter-scale sails with kHz frequencies, Q∼107 and Q\timesmass∼ 10 g. Vertically integrating a 7 kHz device with a nanoribbon, we realize a monolithic cavity optomechanical accelerometer with a room temperature thermal noise of 40 ng0/√(Hz), sufficient to resolve μg0/√(Hz) ambient vibration over a bandwidth of 4 kHz with a displacement imprecision of 10-14 m/√(Hz). Cryogenic arrays of sail membranes may be attractive for new physics searches and distributed quantum sensing experiments.