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Parallel quantized charge pumping

Source: Phys. Rev. B 80, 113303 (2009); doi:10.1103/PhysRevB.80.113303

Published 16 September 2009

KEYWORDS and PACS
Keywords
PACS
  • 73.63.-b
    Electronic transport in nanoscale materials and structures
  • 71.55.Eq
    Impurity and defect levels in III-V semiconductors
  • 73.21.La
    Quantum dots (electron states/collective excitations)
  • 73.63.Nm
    Quantum wires (electronic transport)
  • YEAR: 2009
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PUBLICATION DATA
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S. J. Wright,1,2 M. D. Blumenthal,1 M. Pepper,3,1 D. Anderson,1 G. A. C. Jones,1 C. A. Nicoll,1 and D. A. Ritchie1
1Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
2Toshiba Research Europe Ltd., Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0WE, United Kingdom
3Department of Electronic & Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom
Two quantized charge pumps are operated in parallel. The total current generated is shown to be far more accurate than the current produced with just one pump operating at a higher frequency. With the application of a perpendicular magnetic field the accuracy of quantization is shown to be <20  ppm for a current of 108.9 pA. The scheme for parallel pumping presented in this work has applications in quantum information processing, the generation of single photons in pairs and bunches, neural networking, and the development of a quantum standard for electrical current. All these applications will benefit greatly from the increase in output current without the characteristic decrease in accuracy as a result of high-frequency operation. ©2009 The American Physical Society
History: Received 1 July 2009; revised 5 August 2009; published 16 September 2009
Permalink: http://link.aps.org/abstract/PRB/v80/e113303

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