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Updated: Aug 3, 2026

Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Sensitivity and linearity of superconducting radio-frequency single-electron transistors: effects of quantum charge
Madhu Thalakulam1, Z Ji, A J Rimberg
1Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
Abstract:
We have investigated the effects of quantum fluctuations of quasiparticles on the operation of superconducting radio-frequency single-electron transistors (rf-SETs) for large values of the quasiparticle cotunneling parameter alpha = 8EJ/Ec, where EJ and Ec are the Josephson and charging energies. We find that, for alpha > 1, subgap rf-SET operation is still feasible despite quantum fluctuations that wash out quasiparticle tunneling thresholds. Surprisingly, such rf-SETs show linearity and signal-to-noise ratio superior to those obtained when quantum fluctuations are weak, while still demonstrating excellent charge sensitivity.
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