Assessing the Operating Characteristics of an Ion-Milled Phonon-Mediated Quantum Parity Detector
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 $1.8 \pm 0.8 μ\mathrm{m}^{-3}$, 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.
Fields of Study & Subjects
Dark Matter and Cosmic Phenomena
Atomic and Subatomic Physics Research
Particle physics theoretical and experimental studies
Publication details
- Journal / source
- IEEE Transactions on Applied Superconductivity
- Volume
- 36
- Issue
- 6
- Pages
- 2402006–2402006
- Publication date
- 29 April 2026
- Language
- EN