Rapid measurement of quantum systems using feedback control

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Title Rapid measurement of quantum systems using feedback control
Author Combes, Joshua Leo Alfred; Wiseman, Howard Mark; Jacobs, Kurt
Journal Name Physical Review Letters
Editor George Basbas, Jack Sandweiss, Reinhardt B. Schuhmann, Stanley G. Brown
Year Published 2008
Place of publication United States
Publisher American Physical Society
Abstract We introduce a feedback control algorithm that increases the speed at which a measurement extracts information about a d-dimensional system by a factor that scales as d2. Generalizing this algorithm, we apply it to a register of n qubits and show an improvement of O(n). We derive analytical bounds on the benefit provided by the feedback and perform simulations that confirm that this speedup is achieved.
Peer Reviewed Yes
Published Yes
Publisher URI http://prl.aps.org/
Alternative URI http://dx.doi.org/10.1103/PhysRevLett.100.160503
Copyright Statement Copyright 2008 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 100
Page from 160503-1
Page to 160503-4
ISSN 0031-9007
Date Accessioned 2008-11-26
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject PRE2009-Theoretical Physics
URI http://hdl.handle.net/10072/22529
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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