Speaker
Description
The development of quantum-limited charge amplifiers is enabling new classes of detectors for rare-event physics, with applications in low-mass dark matter and CEvNS. We report on recent progress in the development of a cavity-coupled Cooper pair transistor (cCPT) amplifier, designed to achieve sub single-electron sensitivity while remaining modular and detector-target agnostic. Building on joint work with SLAC, LANL, U Chicago, and Syracuse, our approach combines qubit-derived electrometers with high-impedance resonators, enabling integration with low-capacitance solid-state detectors. I will discuss the design, initial cryogenic testing, and projected coupling to narrow-bandgap semiconductors under development. This charge sensing platform can serve both as a standalone low-threshold ionization detector and as a flexible backend for hybrid charge/phonon devices. I will also briefly describe ongoing work on SQUATs, a transmon-based phonon sensor using a similar architecture, targeting single meV phonon sensitivity.
