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We demonstrate feedback cooling of a millimeter-scale, 40 kHz SiN membranefrom room temperature to 5 mK (3000 phonons) using a Michelson interferometer,and discuss the challenges to ground state cooling without an optical cavity.This advance appears within reach of current membrane technology, positioningit as a compelling alternative to levitated systems for quantum sensing andfundamental weak force measurements.

Towards cavity-free ground state cooling of an acoustic-frequency silicon nitride membrane