Listening For New Physics With Quantum Acoustics

Ryan Linehan, Tanner Trickle, Christopher R. Conner, Sohitri Ghosh, Tongyan Lin,, et. al.

22 Oct 2024.

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Abstract

We present a novel application of a qubit-coupled phonon detector to search for new physics, e.g., ultralight dark matter (DM) and high-frequency gravitational waves. The detector, motivated by recent advances in quantum acoustics, is composed of superconducting transmon qubits coupled to high-overtone bulk acoustic resonators ( $h$ BARs) and operates in the GHz – 10 GHz frequency range. New physics can excite $O(10 \, \mu \text{eV})$ phonons within the $h$ BAR, which are then converted to qubit excitations via a transducer. We detail the design, operation, backgrounds, and expected sensitivity of a prototype detector, as well as a next-generation detector optimized for new physics signals. We find that a future detector can complement current haloscope experiments in the search for both dark photon DM and high-frequency gravitational waves. Lastly we comment on such a detector’s ability to operate as a $10 \, \mu\text{eV}$ threshold athermal phonon sensor for sub-GeV DM detection.