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Proceedings Paper

Real-time electron counting in semiconductor nanostructures
Author(s): A. J. Rimberg; M. Thalakulam; W. Lu; Z. Ji; L. N. Pfeiffer; K. W. West
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Paper Abstract

By coupling a radio-frequency single-electron transistor (RF-SET) to a quantum dot (QD) in a GaAs/AlGaAs heterostructure, we have succeeded in detecting the tunneling of individual electrons on and off the QD on time scales as short as one microsecond. Using charge detection to probe the state of the QD allows us to nearly isolate the dot from its leads, thereby minimizing decoherence-inducing effects of the environment. We have extended these charge detection techniques to double quantum dots (DQDs) that can simultaneously be used to characterize the backaction of the RF-SET. The combined RF-SET/DQD system is well-suited to the development of charge- or spin-based quantum bits, and to investigation of the quantum measurement problem.

Paper Details

Date Published: 18 May 2005
PDF: 9 pages
Proc. SPIE 5790, Terahertz for Military and Security Applications III, (18 May 2005); doi: 10.1117/12.603651
Show Author Affiliations
A. J. Rimberg, Dartmouth College (United States)
M. Thalakulam, Rice Univ. (United States)
W. Lu, Rice Univ. (United States)
Z. Ji, Rice Univ. (United States)
L. N. Pfeiffer, Bell Labs., Lucent Technology Inc. (United States)
K. W. West, Bell Labs., Lucent Technology Inc. (United States)

Published in SPIE Proceedings Vol. 5790:
Terahertz for Military and Security Applications III
R. Jennifer Hwu; Dwight L. Woolard; Mark J. Rosker, Editor(s)

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