Quartz phononic crystal resonators for hybrid acoustic quantum memories

• URL: http://arxiv.org/abs/2509.07900v1
• Date: Tue, 09 Sep 2025 16:32:28 GMT
• Title: Quartz phononic crystal resonators for hybrid acoustic quantum memories
• Authors: Yang Hu, Angad Gupta, Jacob Repicky, Michael Hatridge, Thomas P. Purdy,
• Abstract summary: Circuit quantum acousto systems have emerged as a promising platform for quantum information by coupling superconducting qubits to mechanical resonators.<n>We demonstrate suspended quartz phononic crystal resonators at 100 MHz with millisecond lifetimes at 8 K.
• Score: 4.159045963273172
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Circuit quantum acoustodynamics systems have emerged as a promising platform for quantum information by coupling superconducting qubits to mechanical resonators, with their long-lived mechanical modes serving as quantum memories. We demonstrate suspended quartz phononic crystal resonators at 100 MHz with millisecond lifetimes at 8 K. With a contactless electrode geometry suppressing both two-level system losses and other electrode-induced energy dissipation, we evaluate the piezoelectric coupling rate between the mechanical modes and fluxonium qubits (resonant coupling) and transmon qubits (parametric coupling mediated by a Josephon-junction-based three-wave mixer). We further discuss multi-period defect geometries for enhancing these coupling rates.

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