Single qubit measurements with an asymmetric single-electron transistor

Details Single qubit measurements with an asymmetric single-electron transistor Single qubit measurements with an asymmetric single-electron transistor

2004-08-02

arxiv.org/abs/cond-mat/0408051v2

Phys. Rev. B 72, 073303 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, more explanations added, Phys. Rev. B, in press

Scientific paper

10.1103/PhysRevB.72.073303

We investigate qubit measurements using a single electron transistor (SET). Applying the Schr\"odinger equation to the entire system we find that an asymmetric SET is considerably more efficient than a symmetric SET. The asymmetric SET becomes close to an ideal detector in the large asymmetry limit. We also compared the SET detector with a point-contact detector. This comparison allows us to illuminate the relation between information gain in the measurement process and the decoherence generated by these measurement devices.

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