Quantum feedback for rapid state preparation in the presence of control imperfections

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Title Quantum feedback for rapid state preparation in the presence of control imperfections
Author Combes, Joshua Leo Alfred; Wiseman, Howard Mark
Journal Name Journal of Physics B
Year Published 2011
Place of publication United Kingdom
Publisher Institute of Physics Publishing Ltd.
Abstract Quantum feedback control protocols can improve the operation of quantum devices. Here we examine the performance of a purification protocol when there are imperfections in the controls. The ideal feedback protocol produces an x-eigenstate from a mixed state in the minimum time, and is known as rapid state preparation. The imperfections we examine include time delays in the feedback loop, finite strength feedback, calibration errors and inefficient detection. We analyse these imperfections using the Wiseman–Milburn feedback master equation and related formalism. We find that the protocol is most sensitive to time delays in the feedback loop. For systems with slow dynamics, however, our analysis suggests that inefficient detection would be the bigger problem. We also show how system imperfections, such as dephasing and damping, can be included in a model via the feedback master equation.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1088/0953-4075/44/15/154008
Copyright Statement Copyright 2011 Institute of Physics Publishing. 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 44
Issue Number 15
Page from 154008-1
Page to 154008-8
ISSN 0953-4075
Date Accessioned 2011-09-21
Language en_US
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Quantum Information, Computation and Communication; Quantum Optics; Quantum Physics
URI http://hdl.handle.net/10072/42682
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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