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Science 30 April 1999:
Vol. 284. no. 5415, pp. 779 - 781
DOI: 10.1126/science.284.5415.779
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Reports

Quantum Annealing of a Disordered Magnet

J. Brooke, 1 D. Bitko, 1 T. F. , Rosenbaum, 1* G. Aeppli 2

Traditional simulated annealing uses thermal fluctuations for convergence in optimization problems. Quantum tunneling provides a different mechanism for moving between states, with the potential for reduced time scales. Thermal and quantum annealing are compared in a model disordered magnet, where the effects of quantum mechanics can be tuned by varying an applied magnetic field. The results indicate that quantum annealing hastens convergence to the optimum state.

1 The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637, USA.
2 NEC Research Institute, 4 Independence Way, Princeton, NJ 08540, USA.
*   To whom correspondence should be addressed. E-mail: t-rosenbaum{at}uchicago.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Quantum Phase Transition of a Magnet in a Spin Bath.
H. M. Ronnow, R. Parthasarathy, J. Jensen, G. Aeppli, T. F. Rosenbaum, and D. F. McMorrow (2005)
Science 308, 389-392
   Abstract »    Full Text »    PDF »
Theory of Quantum Annealing of an Ising Spin Glass.
G. E. Santoro, R. Martoňak, E. Tosatti, and R. Car (2002)
Science 295, 2427-2430
   Abstract »    Full Text »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)