Ultralight dark matter with masses near 10^-8 eV could be detected by milligram-scale quantum-limited optomechanical sensors operating at kHz frequencies, with arrays improving the reach.
Note that x(t) is imprinted onto the light Y quadrature through the optomechanical coupling; what one actually does is to make an interfero- metric measurement of this quadrature
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Ultralight dark matter detection with mechanical quantum sensors
Ultralight dark matter with masses near 10^-8 eV could be detected by milligram-scale quantum-limited optomechanical sensors operating at kHz frequencies, with arrays improving the reach.