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This study identifies specific material defects at the interface of piezoelectric layers as primary loss mechanisms limiting coherence in high-overtone bulk acoustic-wave resonators coupled to superconducting circuits. By quantifying these factors, researchers establish concrete pathways for improving phonon lifetimes and quantum cooperativity in circuit quantum acoustodynamics platforms. These findings are critical for advancing hybrid quantum systems that leverage mechanical waves alongside traditional qubits.

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ETH Zurich Details Loss Mechanisms in High-Coherence Resonators

Quantum ZeitgeistJuly 19, 20265 min read

Loss mechanisms in high-coherence multimode mechanical resonators coupled to superconducting circuits are detailed, with research conducted at the Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland and the Quantum Center, ETH Zurich, CH-8093 Zurich, Switzerland. Raquel Garcia-Belles and Alexander Anferov contributed equally to this work.

A collaborative effort spanning three Swiss institutions, ETH Zurich, EPFL, and EMPA, has identified key loss mechanisms limiting the coherence of advanced mechanical resonators. Researchers Raquel Garcia-Belles and Alexander Anferov, who contributed equally to the work at ETH Zurich’s Department of Physics and Quantum Center, focused on multimode mechanical resonators coupled to superconducting circuits, a combination promising for building blocks of quantum systems. The study reveals that defects within the piezoelectric material and its interface with the resonator bulk are critical factors impacting performance; measurements…

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