On-demand single-electron transfer between distant quantum dots

R. P. G. McNeil, M. Kataoka, C. J. B. Ford (), C. H. W. Barnes, D. Anderson, G. A. C. Jones, I. Farrer and D. A. Ritchie
Additional contact information
R. P. G. McNeil: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue
M. Kataoka: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue
C. J. B. Ford: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue
C. H. W. Barnes: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue
D. Anderson: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue
G. A. C. Jones: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue
I. Farrer: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue
D. A. Ritchie: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue

Nature, 2011, vol. 477, issue 7365, 439-442

Abstract: Electrons surfing on a sound wave Electrons strongly interact with other electrons and their environment, making it extremely difficult to isolate and detect a single moving electron in a similar way to single photons in quantum optics experiments. But now, in two unrelated reports, Hermelin et al. and McNeil et al. demonstrate that it is possible to emit a single electron from one quantum dot and detect it again with high efficiency after longevity propagation over several micrometres to another quantum dot. The single electron is isolated from other electrons as it is sent into a one-dimensional channel, where it is carried along on a surface acoustic wave induced by microwave excitation. McNeil et al. also show that the same electron can be transferred back and forth up to 60 times, a total distance of 0.25 millimetres. This work demonstrates a new way of transporting a single quantum particle over a long distance in nanostructures, and could pave the way for a range of quantum optics experiments and for quantum information circuits based on single electrons.

Date: 2011
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DOI: 10.1038/nature10444

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