Quantum measurement characteristics of double-dot single electron transistor

Details Quantum measurement characteristics of double-dot single electron transistor Quantum measurement characteristics of double-dot single electron transistor

2006-12-29

arxiv.org/abs/cond-mat/0612692v3

Phys. Rev. B 75, 155333 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.75.155333

Owing to a few unique advantages, double-dot single electron transistor has been proposed as an alternative detector for charge states. In this work, we present a further study for its signal-to-noise property, based on a full analysis of the setup configuration symmetry. It is found that the effectiveness of the double-dot detector can approach that of an ideal detector, if the symmetric capacitive coupling is taken into account. The quantum measurement efficiency is also analyzed, by comparing the measurement time with the measurement-induced dephasing time.

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