Continuous quantum measurement: Inelastic tunneling and lack of current oscillations

Stace, TM and Barrett, SD (2004) Continuous quantum measurement: Inelastic tunneling and lack of current oscillations. Physical Review Letters, 92 13: 136802-1-136802-4. doi:10.1103/PhysRevLett.92.136802

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Author Stace, TM
Barrett, SD
Title Continuous quantum measurement: Inelastic tunneling and lack of current oscillations
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2004-03-02
Year available 2005
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.92.136802
Open Access Status File (Publisher version)
Volume 92
Issue 13
Start page 136802-1
End page 136802-4
Total pages 4
Place of publication College Pk
Publisher American Physical Soc
Language eng
Abstract We study the dynamics of a charge qubit, consisting of a single electron in a double well potential coupled to a point-contact (PC) electrometer, using the quantum trajectories formalism. Contrary to previous predictions, we show formally that, in the sub-Zeno limit, coherent oscillations in the detector output are suppressed, and the dynamics is dominated by inelastic processes in the PC. Furthermore, these reduce the detector efficiency and induce relaxation even when the source-drain bias is zero. This is of practical significance since it means the detector will act as a source of decoherence. Finally, we show that the sub-Zeno dynamics is divided into two regimes: low and high bias in which the PC current power spectra show markedly different behavior.
Keyword Physics, Multidisciplinary
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 39 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 35 times in Scopus Article | Citations
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Created: Fri, 25 Jan 2008, 16:10:01 EST