Design and Characterization of Superconducting Quasiparticle-Amplifying Transmons

Oral-In-person

Abstract

The superconducting quasiparticle-amplifying transmon (SQUAT) is a qubit-based sensor for THz photons and meV-scale phonons, and will be deployed as the primary sensor in a number of upcoming low-mass dark matter and neutrino scattering applications. Events create quasiparticles which tunnel across the transmon's junction, flipping its parity state, and are detected by monitoring the parity switching rate via the SQUAT's rf transmission. The SQUAT is inherently multiplexable and has the potential for excellent energy resolution, bandwidth, and noise performance. Here, we present on the design and measured characteristics of the current SQUAT devices, and discuss devices fabricated with hafnium junctions which allow for greater quasiparticle trapping.

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Publication: A First Demonstration of the SQUAT Detector Architecture: Direct Measurement of Resonator-Free Charge-Sensitive Transmon (planned)

Presenters

  • Taj Dyson

    • Stanford University / SLAC National Accelerator Laboratory

Authors

  • Taj Dyson

    • Stanford University / SLAC National Accelerator Laboratory

  • Noah Kurinsky

    • Stanford University / SLAC National Accelerator Laboratory

  • Chiara Salemi

    • UC Berkeley/LBNL

  • Hannah Magoon

    • Stanford University / SLAC National Accelerator Laboratory

  • Taylor Aralis

    • SLAC National Accelerator Laboratory

  • Grace Bratrud

    • Northwestern University

  • Samuel Condon

    • Stanford University

  • Jadyn Anczarski

    • Villanova University

  • Caleb Fink

    • Los Alamos National Laboratory (LANL)

  • Shannon Harvey

    • Stanford University / SLAC National Accelerator Laboratory

  • Aviv Simchony

    • Stanford university

  • Zoë Smith

    • Stanford university

  • Noshin Tabassum

    • SLAC National Accelerator Laboratory

  • Betty Young

    • Santa Clara University

  • David Schuster

    • Stanford University / SLAC National Accelerator Laboratory

  • David Schuster

    • Stanford University / SLAC National Accelerator Laboratory