Mixed State Discrimination Using Optimal Control

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Title Mixed State Discrimination Using Optimal Control
Author Higgins, Brendon Lloyd; Booth, Byron; Doherty, A. C.; Bartlett, S. D.; Wiseman, Howard Mark; Pryde, Geoff
Journal Name Physical Review Letters
Year Published 2009
Place of publication USA
Publisher American Physical Society
Abstract We present theory and experiment for the task of discriminating two nonorthogonal states, given multiple copies. We implement several local measurement schemes, on both pure states and states mixed by depolarizing noise. We find that schemes which are optimal (or have optimal scaling) without noise perform worse with noise than simply repeating the optimal single-copy measurement. Applying optimal control theory, we derive the globally optimal local measurement strategy, which outperforms all other local schemes, and experimentally implement it for various levels of noise.
Peer Reviewed Yes
Published Yes
Publisher URI http://prl.aps.org/
Alternative URI http://dx.doi.org/10.1103/PhysRevLett.103.220503
Copyright Statement Copyright 2009 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 103
Issue Number 22
Page from 220503-1
Page to 220503-4
ISSN 1079-7114
Date Accessioned 2009-11-25
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Quantum Information, Computation and Communication; Quantum Optics
URI http://hdl.handle.net/10072/30947
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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