Abstract
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 10-6 eHz 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× 10-5 eHz and bandwidth 100 MHz are achieved.
Original language | English |
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Article number | 092502 |
Journal | Applied Physics Letters |
Volume | 87 |
Issue number | 9 |
DOIs | |
Publication status | Published - 29 Aug 2005 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)