Charge sensitivity of the inductive single-electron transistor

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We calculate the charge sensitivity of a recently demonstrated device where the Josephson inductance of a single Cooper-pair transistor is measured. We find that the intrinsic limit to detector performance is set by oscillator quantum noise. Sensitivity better than 10−6e/Hz⎯⎯⎯⎯⎯√ is possible with a high Q value ∼103, or using a superconducting quantum interference device amplifier. The model is compared to experiment, where charge sensitivity 3×10−5e/Hz⎯⎯⎯⎯⎯√ and bandwidth 100 MHz are achieved.
Original languageEnglish
Article number092502
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed


  • charge sensitivity
  • single-electron tansistors
  • Josephson inductance
  • Cooper-pair transistors


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