Feedback-stabilization of an arbitrary pure state of a two-level atom

Wang, J. and Wiseman, H.M. (2001) Feedback-stabilization of an arbitrary pure state of a two-level atom. Physical Review A, 64 6: 063810-1-063810-9. doi:10.1103/PhysRevA.64.063810

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Author Wang, J.
Wiseman, H.M.
Title Feedback-stabilization of an arbitrary pure state of a two-level atom
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.64.063810
Open Access Status File (Publisher version)
Volume 64
Issue 6
Start page 063810-1
End page 063810-9
Total pages 9
Editor B. Craseman
Place of publication United States
Publisher American Physical Society
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
Abstract Unit-efficiency homodyne detection of the resonance fluorescence of a two-level atom collapses the quantum state of the atom to a stochastically moving point on the Bloch sphere. Recently, Hofmann, Mahler, and Hess [Phys. Rev. A 57, 4877 (1998)] showed that by making part of the coherent driving proportional to the homodyne photocurrent one can stabilize the state to any point on the bottom-half of the sphere. Here we reanalyze their proposal using the technique of stochastic master equations, allowing their results to be generalized in two ways. First, we show that any point on the upper- or lower-half, but not the equator, of the sphere may be stabilized. Second, we consider nonunit-efficiency detection, and quantify the effectiveness of the feedback by calculating the maximal purity obtainable in any particular direction in Bloch space.
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 89 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 95 times in Scopus Article | Citations
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Created: Wed, 15 Aug 2007, 02:20:27 EST