Quantum jumps between dressed states: A proposed cavity-QED test using feedback

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Title Quantum jumps between dressed states: A proposed cavity-QED test using feedback
Author Reiner, J. E.; Wiseman, Howard Mark; Mabuchi, H.
Journal Name Physical Review A (Atomic, Molecular and Optical Physics)
Year Published 2003
Place of publication USA
Publisher American Physical Society
Abstract A strongly driven cavity containing a single resonant strongly coupled atom exhibits a phase bistability. The phase of the field is strongly correlated with the phase of the atomic dipole. It has been shown previously that phase-sensitive monitoring of the field emitted by the cavity would induce conditional quantum jumps between orthogonal atomic dipole states (“dressed” states). Here we show that such monitoring can be used to fix the atom into a single dressed state. As soon as a state-changing quantum jump is inferred from the measurement of the field, the atomic state is flipped using a π pulse. We study this feedback scheme analytically and numerically. We show that the occupation probability of the desired fixed state can be as high as 1-1/8ηC1, where C1≫1 is the single-atom cooperativity and η the detection efficiency (which does not have to be close to unity). The control of the atomic dynamics is manifest in the fluorescence spectrum. The widths of all three peaks are modified from the usual Mollow spectrum, and almost all of the area under one of the sidebands is transferred to the other sideband. This is as expected, as one of the dressed states is essentially unoccupied, and transitions out of it do not occur. In addition, the width of the central peak goes to zero. This indicates coherent scattering due to the nonzero mean atomic dipole created by the feedback.
Peer Reviewed Yes
Published Yes
Publisher URI http://prola.aps.org/abstract/PRA/v67/i4/e042106
Alternative URI http://dx.doi.org/10.1103/PhysRevA.67.042106
Copyright Statement Copyright 2003 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 67
Issue Number 4
Page from 042106.1
Page to 042106.13
ISSN 1050-2947
Date Accessioned 2004-03-29
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Theoretical Physics
URI http://hdl.handle.net/10072/6302
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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