Robust unravelings for resonance fluorescence

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Title Robust unravelings for resonance fluorescence
Author Wiseman, Howard Mark; Brady, Zoe
Journal Name Physical Review A: Atomic, Molecular and Optical Physics
Year Published 2000
Place of publication USA
Publisher American Physical Society
Abstract Monitoring the fluorescent radiation of an atom unravels the master equation evolution by collapsing the atomic state into a pure state which evolves stochastically. A robust unraveling is one that gives pure states that, on average, are relatively unaffected by the master-equation evolution (which applies once the monitoring ceases). The ensemble of pure states arising from the maximally robust unraveling has been suggested to be the most natural way of representing the system [H.M. Wiseman and J.A. Vaccaro, Phys. Lett. A 250, 241 (1998)]. We find that the maximally robust unraveling of a resonantly driven atom requires an adaptive interferometric measurement proposed by Wiseman and Toombes [Phys. Rev. A 60, 2474 (1999)]. The resultant ensemble consists of just two pure states which, in the high driving limit, are close to the eigenstates of the driving Hamiltonian Ωσx/2. This ensemble is the closest thing to a classical limit for a strongly driven atom. We also find that it is possible to reasonably approximate this ensemble using just homodyne detection, an example of a continuous Markovian unraveling. This has implications for other systems, for which it may be necessary in practice to consider only continuous Markovian unravelings.
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Published Yes
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Copyright Statement Copyright 2000 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 62
Page from 023805.1
Page to 023805.12
ISSN 1050-2947
Date Accessioned 2001-01-01
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Science & Technology
Publication Type Article in Scholarly Refereed Journal
Publication Type Code c1

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