A First Demonstration of the SQUAT Detector Architecture: Direct Measurement of Resonator-Free Charge-Sensitive Transmons
2026-01-30 10:44
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The Superconducting Quasiparticle-Amplifying Transmon (SQUAT) is a new sensor architecture for THz (meV) detection based on a weakly
charge-sensitive transmon directly coupled to a transmission line. In such devices, energy depositions break Cooper pairs in the qubit capacitor
islands, generating quasiparticles. Quasiparticles that tunnel across the Josephson junction change the transmon qubit parity, generating a
measurable signal. In this paper, we present the design of first-generation SQUATs and demonstrate an architecture validation. We summarize
initial characterization measurements made with prototype devices, comment on background sources that influence the observed parity-
switching rate, and present experimental results showing simultaneous detection of charge and quasiparticle signals using aluminum-based
SQUATs.
Link to the article is here.
