Accurate high speed single-electron quantum dot preparation - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




Accurate high speed single-electron quantum dot preparation - Condensed Matter > Mesoscale and Nanoscale Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Using standard microfabrication techniques it is now possible to constructdevices, which appear to reliably manipulate electrons one at a time. Thesedevices have potential use as building blocks in quantum computing devices, oras a standard of electrical current derived only from a frequency and thefundamental charge. To date the error rate in semiconductor -tuneable-barrier-pump devices, those which show most promise for high frequency operation, havenot been tested in detail. We present high accuracy measurements of the currentfrom an etched GaAs quantum dot pump, operated at zero source-drain biasvoltage with a single AC-modulated gate driving the pump cycle. By comparisonwith a reference current derived from primary standards, we show that theelectron transfer accuracy is better than 15 parts per million. High-resolutionstudies of the dependence of the pump current on the quantum dot tuningparameters also reveal possible deviations from a model used to describe thepumping cycle.



Author: S. P. Giblin, S. J. Wright, J. Fletcher, M. Kataoka, M. Pepper, T. J. B. M. Janssen, D. A. Ritchie, C. A. Nicoll, D. Anderson, G.

Source: https://arxiv.org/







Related documents