Real-time detection of single electron tunneling using a quantum point contact

L. M. K. Vandersypen; J. M. Elzerman; R. N. Schouten; L. H. Willems van Beveren; R. Hanson; L. P. Kouwenhoven

doi:10.1063/1.1815041

Real-time detection of single electron tunneling using a quantum point contact

Mesoscale and Nanoscale Physics 2009-11-10 v1

Authors: L. M. K. Vandersypen , J. M. Elzerman , R. N. Schouten , L. H. Willems van Beveren , R. Hanson , L. P. Kouwenhoven

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Abstract

We observe individual tunnel events of a single electron between a quantum dot and a reservoir, using a nearby quantum point contact (QPC) as a charge meter. The QPC is capacitively coupled to the dot, and the QPC conductance changes by about 1% if the number of electrons on the dot changes by one. The QPC is voltage biased and the current is monitored with an IV-convertor at room temperature. We can resolve tunnel events separated by only 8 $\mu$ s, limited by noise from the IV-convertor. Shot noise in the QPC sets a 25 ns lower bound on the accessible timescales.

Keywords

quantum dots and electron transport quantum tunneling shot noise

Cite

@article{arxiv.cond-mat/0407121,
  title  = {Real-time detection of single electron tunneling using a quantum point contact},
  author = {L. M. K. Vandersypen and J. M. Elzerman and R. N. Schouten and L. H. Willems van Beveren and R. Hanson and L. P. Kouwenhoven},
  journal= {arXiv preprint arXiv:cond-mat/0407121},
  year   = {2009}
}

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3 pages, 3 figures, submitted

Real-time detection of single electron tunneling using a quantum point contact

Abstract

Keywords

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