Single qubit measurements with an asymmetric single-electron transistor
arXiv:cond-mat/0408051 · doi:10.1103/PhysRevB.72.073303
Abstract
We investigate qubit measurements using a single electron transistor (SET). Applying the Schrödinger 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.
4 pages, more explanations added, Phys. Rev. B, in press
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