Assessing the operating characteristics of an ion-milled phonon-mediated quantum parity detector

• URL: http://arxiv.org/abs/2509.18637v1
• Date: Tue, 23 Sep 2025 04:39:48 GMT
• Title: Assessing the operating characteristics of an ion-milled phonon-mediated quantum parity detector
• Authors: Brandon J. Sandoval, Andrew D. Beyer, Pierre M. Echternach, Sunil R. Golwala, William D. Ho, Lanqing Yuan, Karthik Ramanathan,
• Abstract summary: We detail here engineering results from a Quantum Parity Detector (QPDs)<n>As a first measurement, show that this device has a quiescent quasiparticle density of $1.8 pm 0.8 mu mathrmm-3$, in line with expectation.<n>We also outline an argon ion-mill process for multi-step Josephson Junction fabrication, expanding the sparse literature on this topic.
• Score: 0.7854037738925822
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Phonon sensitive superconducting qubits promise to provide sub-eV energy deposit thresholds, useful for future rare-event experiments looking for interactions from dark matter and neutrinos. We detail here engineering results from a Quantum Parity Detector (QPDs), one of a class of phonon sensitive qubits, and, as a first measurement, show that this device has a quiescent quasiparticle density of $1.8 \pm 0.8 \mu \mathrm{m}^{-3}$, in line with expectation. We also outline an argon ion-mill process for multi-step Josephson Junction fabrication, expanding the sparse literature on this topic, which proves useful in avoiding secondary parasitic junctions.

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