Quantum measurement of coherent tunneling between quantum dots

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Title Quantum measurement of coherent tunneling between quantum dots
Author Wiseman, Howard Mark; Utami, Dian Wahyu; Sun, He Bi; Milburn, G.J.; Kane, B.E.; Dzurak, A.; Clark, R.G.
Journal Name Physical Review B: Condensed Matter and Materials Physics
Editor Peter D. Adams
Year Published 2001
Place of publication USA
Publisher American Physical Society
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.
Peer Reviewed Yes
Published Yes
Publisher URI http://prola.aps.org/browse/PRB
Alternative URI http://dx.doi.org/10.1103/PhysRevB.63.235308
Copyright Statement Copyright 2001 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 63
Issue Number 23
Page from 235308.1
Page to 235308.12
ISSN 1098-0121
Date Accessioned 2002-04-15
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Theoretical Physics
URI http://hdl.handle.net/10072/3771
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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