Renormalized dynamics in charge qubit measurements by a single electron transistor

Details Renormalized dynamics in charge qubit measurements by a single electron transistor Renormalized dynamics in charge qubit measurements by a single electron transistor

2010-10-22

arxiv.org/abs/1010.4622v2

Phys. Lett. A 374, 4904-4908 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures

Scientific paper

10.1016/j.physleta.2010.10.002

We investigate charge qubit measurements using a single electron transistor, with focus on the backaction-induced renormalization of qubit parameters. It is revealed the renormalized dynamics leads to a number of intriguing features in the detector's noise spectra, and therefore needs to be accounted for to properly understand the measurement result. Noticeably, the level renormalization gives rise to a strongly enhanced signal-to-noise ratio, which can even exceed the universal upper bound imposed quantum mechanically on linear-response detectors.

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