Interaction-based quantum metrology showing scaling beyond the Heisenberg limit

M. Napolitano (), M. Koschorreck, B. Dubost, N. Behbood, R. J. Sewell and M. W. Mitchell
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M. Napolitano: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park
M. Koschorreck: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park
B. Dubost: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park
N. Behbood: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park
R. J. Sewell: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park
M. W. Mitchell: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park

Nature, 2011, vol. 471, issue 7339, 486-489

Abstract: Towards 'super-Heisenberg' quantum metrology Quantum metrology uses entanglement and other quantum resources to improve precision measurement, resulting in sensitivity limited by the Heisenberg uncertainty principle. But in theory, interactions among particles may allow scaling beyond this limit into 'super-Heisenberg' territory. Napolitano et al. prove experimentally that this can indeed occur in a nonlinear, non-destructive measurement of the magnetization of an atomic ensemble. The work shows that inter-particle interactions could be a useful resource for quantum metrology, although the relative performance of nonlinear versus linear measurements has yet to be explored more generally.

Date: 2011
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DOI: 10.1038/nature09778

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