The Superconducting Quasiparticle-Amplifying Transmon: A Qubit-Based Sensor for meV Scale Phonons and Single THz Photons

• URL: http://arxiv.org/abs/2310.01345v4
• Date: Thu, 14 Nov 2024 16:38:06 GMT
• Title: The Superconducting Quasiparticle-Amplifying Transmon: A Qubit-Based Sensor for meV Scale Phonons and Single THz Photons
• Authors: Caleb W. Fink, Chiara P. Salemi, Betty A. Young, David I. Schuster, Noah A. Kurinsky,
• Abstract summary: SQUATs: Superconducting Quasiparticle-Amplifying Transmons. We propose a novel sensor based on the transmon qubit architecture combined with a signal-enhancing superconducting quasiparticle amplification stage. We predict that with minimal R&D effort, solid-state based detectors patterned with these sensors can achieve sensitivity to single THz photons, and sensitivity to $1,mathrmmeV$ phonons in the detector absorber substrate on the $mumathrms$ timescale.
• Score: 0.19528996680336308
• License:
• Abstract: With great interest from the quantum computing community, an immense amount of R&D effort has been invested into improving superconducting qubits. The technologies developed for the design and fabrication of these qubits can be directly applied to applications for ultra-low threshold particle detectors, e.g. low-mass dark matter and far-IR photon sensing. We propose a novel sensor based on the transmon qubit architecture combined with a signal-enhancing superconducting quasiparticle amplification stage. We refer to these sensors as SQUATs: Superconducting Quasiparticle-Amplifying Transmons. We detail the operating principle and design of this new sensor and predict that with minimal R&D effort, solid-state based detectors patterned with these sensors can achieve sensitivity to single THz photons, and sensitivity to $1\,\mathrm{meV}$ phonons in the detector absorber substrate on the $\mu\mathrm{s}$ timescale.

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