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There are a number of theoretical predictions for astrophysical and cosmological objects, which emit high frequency (10^6-10^9 Hz) gravitation waves (GW) or contribute somehow to the stochastic high frequency GW background. Here we propose a new sensitive detector in this frequency band, which is based on existing cryogenic ultrahigh quality factor quartz bulk acoustic wave cavity technology, coupled to near-quantum-limited SQUID amplifiers at 20 mK. We show that spectral strain sensitivities reaching 10^-22 per Hz per mode is possible, which in principle can cover the frequency range with multiple (>100) modes with quality factors varying between 10^6 and 10^10 allowing wide bandwidth detection. Due to its compactness and well-established manufacturing process, the system is easily scalable into arrays and distributed networks that can also impact the overall sensitivity and introduce coincidence analysis to ensure no false detections.
Goryachev et al. (Mon,) studied this question.