Dynamics of a mesoscopic charge quantum bit under continuous quantum measurement

Goan, H. and Milburn, G. J. (2001) Dynamics of a mesoscopic charge quantum bit under continuous quantum measurement. Physical Review B, 64 23: 235307-1-235307-12. doi:10.1103/PhysRevB.64.235307

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Author Goan, H.
Milburn, G. J.
Title Dynamics of a mesoscopic charge quantum bit under continuous quantum measurement
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
Publication date 2001-01-01
Year available 2001
Sub-type Article (original research)
DOI 10.1103/PhysRevB.64.235307
Open Access Status File (Publisher version)
Volume 64
Issue 23
Start page 235307-1
End page 235307-12
Total pages 12
Editor Peter D Adams
Place of publication College Park, Maryland, USA
Publisher American Physical Society
Language eng
Subject C1
230204 Applied Statistics
780102 Physical sciences
Abstract We present the conditional quantum dynamics of an electron tunneling between two quantum dots subject to a measurement using a low transparency point contact or tunnel junction. The double dot system forms a single qubit and the measurement corresponds to a continuous in time readout of the occupancy of the quantum dot. We illustrate the difference between conditional and unconditional dynamics of the qubit. The conditional dynamics is discussed in two regimes depending on the rate of tunneling through the point contact: quantum jumps, in which individual electron tunneling current events can be distinguished, and a diffusive dynamics in which individual events are ignored, and the time-averaged current is considered as a continuous diffusive variable. We include the effect of inefficient measurement and the influence of the relative phase between the two tunneling amplitudes of the double dot/point contact system.
Keyword Physics, Condensed Matter
State Diffusion
Q-Index Code C1
Institutional Status UQ

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 103 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 108 times in Scopus Article | Citations
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Created: Wed, 15 Aug 2007, 02:06:20 EST