Quantum measurement of coherent tunneling between quantum dots

H. M. Wiseman, D. Wahyu Utami, He Bi Sun, G. J. Milburn, B. E. Kane, A. Dzurak, R. G. Clark

Research output: Contribution to journalArticle

27 Citations (Scopus)

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.
Original languageEnglish
Article number235308
Pages (from-to)235308-1-235308-12
Number of pages12
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume63
Issue number23
DOIs
Publication statusPublished - 2001
Externally publishedYes

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