Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-10-15
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.93.066804
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.
Ji Zhengfeng
Rimberg A. J.
Thalakulam Madhu
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