Quantum measurement of coherent tunnelling between quantum dots

Wiseman, H. M., Wahyu Utami, D., Sun, H., Milburn, G. J., Kane, B. E., Dzurak, A. and Clark, R. G. (2001) Quantum measurement of coherent tunnelling between quantum dots. Physical Review B, 63 23: 235308-235319. doi:10.1103/PhysRevB.63.235308

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Author Wiseman, H. M.
Wahyu Utami, D.
Sun, H.
Milburn, G. J.
Kane, B. E.
Dzurak, A.
Clark, R. G.
Title Quantum measurement of coherent tunnelling between quantum dots
Journal name Physical Review B
ISSN 1098-0121
Publication date 2001
Sub-type Article (original research)
DOI 10.1103/PhysRevB.63.235308
Open Access Status File (Publisher version)
Volume 63
Issue 23
Start page 235308
End page 235319
Total pages 12
Editor Peter D Adams
Place of publication Maryland, USA
Publisher American Physical Review
Collection year 2001
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
Abstract We describe the conditional and unconditional dynamics of two coupled quantum dots when one dot is subjected to a measurement of its occupation number by coupling it to a third readout dot via the Coulomb interaction. The readout dot is coupled to source and drain leads under weak bias, and a tunnel current flows through a single bound state when energetically allowed. The occupation of the quantum dot near the readout dot shifts the bound state of the readout dot from a low conducting state to a high conducting state. The measurement is made by continuously monitoring the tunnel current through the readout dot. We show that there is a difference between the time scale for the measurement-induced decoherence between the localized states of the dots, and the time scale on which the system becomes localized due to the measurement.
Keyword Physics, Condensed Matter
Single-electron Transistor
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 14 Aug 2007, 15:51:50 EST