Continuous quantum nondemolition feedback and unconditional atomic spin squeezing.

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Title Continuous quantum nondemolition feedback and unconditional atomic spin squeezing.
Author Thomsen, Laura Kathrine Wehde; Mancini, S.; Wiseman, Howard Mark
Journal Name Journal of Physics B: Atomic, Molecular and Optical Physics
Year Published 2002
Place of publication UK
Publisher Institute of Physics Publishing
Abstract We discuss the theory and experimental considerations of a quantum feedback scheme for producing deterministically reproducible spin squeezing. Continuous nondemolition atom number measurement from monitoring a probe field conditionally squeezes the sample. Simultaneous feedback of the measurement results controls the quantum state such that the squeezing becomes unconditional. We find that for very strong cavity coupling and a limited number of atoms, the theoretical squeezing approaches the Heisenberg limit. Strong squeezing will still be produced at weaker coupling and even in free space (thus presenting a simple experimental test for quantum feedback). The measurement and feedback can be stopped at any time, thereby freezing the sample with a desired amount of squeezing.
Peer Reviewed Yes
Published Yes
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Copyright Statement Copyright 2002 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 35
Page from 4937
Page to 4952
ISSN 0953-4075
Date Accessioned 2003-04-11
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Theoretical Physics
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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