Experimental feedback control of quantum systems using weak measurements

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Title Experimental feedback control of quantum systems using weak measurements
Author Gillett, G. G.; Dalton, R. B.; Lanyon, B. P.; Almeida, M. P.; Barbieri, M.; Pryde, Geoff; O'Brien, J. L.; Resch, K. J.; Bartlett, S. D.; White, A. G.
Journal Name Physical Review Letters
Year Published 2010
Place of publication United States
Publisher American Physical Society
Abstract A goal of the emerging field of quantum control is to develop methods for quantum technologies to function robustly in the presence of noise. Central issues are the fundamental limitations on the available information about quantum systems and the disturbance they suffer in the process of measurement. In the context of a simple quantum control scenario—the stabilization of nonorthogonal states of a qubit against dephasing—we experimentally explore the use of weak measurements in feedback control. We find that, despite the intrinsic difficultly of implementing them, weak measurements allow us to control the qubit better in practice than is even theoretically possible without them. Our work shows that these more general quantum measurements can play an important role for feedback control of quantum systems.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1103/PhysRevLett.104.080503
Copyright Statement Copyright 2010 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 104
Issue Number 8
Page from 080503-1
Page to 080503-4
ISSN 0031-9007
Date Accessioned 2010-06-25
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/10072/33225
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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