Experimental feedback control of quantum systems using weak measurements

Gillett, G. G., Dalton, R. B., Lanyon, B. P., Almeida, M. P., Barbieri, M., Pryde, G. J., O'Brien, J. L., Resch, K. J., Bartlett, S. D. and White, A. G. (2010) Experimental feedback control of quantum systems using weak measurements. Physical Review Letters, 104 8: 080503-1-080503-4. doi:10.1103/PhysRevLett.104.080503

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Author Gillett, G. G.
Dalton, R. B.
Lanyon, B. P.
Almeida, M. P.
Barbieri, M.
Pryde, G. J.
O'Brien, J. L.
Resch, K. J.
Bartlett, S. D.
White, A. G.
Title Experimental feedback control of quantum systems using weak measurements
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2010-02-01
Year available 2010
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.104.080503
Open Access Status File (Publisher version)
Volume 104
Issue 8
Start page 080503-1
End page 080503-4
Total pages 4
Editor George Basbas
Jack Sandweiss
Reinhardt B. Schuhmann
Stanley G. Brown
Place of publication Ridge, NY, U.S.A.
Publisher American Physical Society
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
0206 Quantum Physics
Formatted 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.
© 2010 The American Physical Society
Keyword Radiation-pressure
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 61 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 62 times in Scopus Article | Citations
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Created: Sun, 21 Mar 2010, 10:01:21 EST