Sensitivity and Linearity of Superconducting Radio-Frequency Single-Electron Transistors: Effects of Quantum Charge Fluctuations

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 $\alpha =8E_J/E_c$, where $E_J$ and $E_c$ are the Josephson and charging energies. We find that for $\alpha >1$, subgap RF-SET operation is still feasible despite quantum fluctuations that renormalize the SET charging energy and 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.

Submitted to Phys. Rev. Lett

References in corpus (4)

• Resonant Cooper Pair Tunneling: Quantum Noise and Measurement Characteristics
• Full Frequency Back-Action Spectrum of a Single Electron Transistor during Qubit read-out
• Shot noise for resonant Cooper pair tunneling
• Charge Transport Processes in a Superconducting Single-Electron Transistor Coupled to a Microstrip Transmission Line

Cited by in corpus (7)

• Introduction to Quantum Noise, Measurement and Amplification
• Dynamics of a nanomechanical resonator coupled to a superconducting single-electron transistor
• Time-domain measurements of quasiparticle tunneling rates in a single-Cooper-pair transistor
• Leggett-Garg inequalities for the statistics of electron transport
• On-Chip Matching Networks for Radio-Frequency Single-Electron-Transistors
• Effect of quantum fluctuations on even-odd energy difference in a Cooper-pair box
• Quantum current noise from a Born-Markov master equation