A First Demonstration of the SQUAT Detector Architecture: Direct Measurement of Resonator-Free Charge-Sensitive Transmons
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2026
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| author | Magoon, H. Aralis, T. Dyson, T. Anczarski, J. Baxter, D. Bratrud, G. Carpenter, R. Condon, S. Droster, A. Figueroa-Feliciano, E. Fink, C. W. Harvey, S. Simchony, A. Smith, Z. J. Stevens, S. Tabassum, N. Young, B. A. Salemi, C. P. Stifter, K. Schuster, D. I. Kurinsky, N. A. |
| author_facet | Magoon, H. Aralis, T. Dyson, T. Anczarski, J. Baxter, D. Bratrud, G. Carpenter, R. Condon, S. Droster, A. Figueroa-Feliciano, E. Fink, C. W. Harvey, S. Simchony, A. Smith, Z. J. Stevens, S. Tabassum, N. Young, B. A. Salemi, C. P. Stifter, K. Schuster, D. I. Kurinsky, N. A. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16261 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A First Demonstration of the SQUAT Detector Architecture: Direct Measurement of Resonator-Free Charge-Sensitive Transmons Magoon, H. Aralis, T. Dyson, T. Anczarski, J. Baxter, D. Bratrud, G. Carpenter, R. Condon, S. Droster, A. Figueroa-Feliciano, E. Fink, C. W. Harvey, S. Simchony, A. Smith, Z. J. Stevens, S. Tabassum, N. Young, B. A. Salemi, C. P. Stifter, K. Schuster, D. I. Kurinsky, N. A. Instrumentation and Detectors Quantum Physics 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. |
| title | A First Demonstration of the SQUAT Detector Architecture: Direct Measurement of Resonator-Free Charge-Sensitive Transmons |
| topic | Instrumentation and Detectors Quantum Physics |
| url | https://arxiv.org/abs/2601.16261 |