Demonstrating Heisenberg-limited unambiguous phase estimation without adaptive measurements

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Title Demonstrating Heisenberg-limited unambiguous phase estimation without adaptive measurements
Author Higgins, Brendon Lloyd; Berry, D.W.; Bartlett, S. D.; Mitchell, M. W.; Wiseman, Howard Mark; Pryde, Geoff
Journal Name New Journal of Physics
Year Published 2009
Place of publication United Kingdom
Publisher IOP Publishing Ltd
Abstract We derive, and experimentally demonstrate, an interferometric scheme for unambiguous phase estimation with precision scaling at the Heisenberg limit that does not require adaptive measurements. That is, with no prior knowledge of the phase, we can obtain an estimate of the phase with a standard deviation that is only a small constant factor larger than the minimum physically allowed value. Our scheme resolves the phase ambiguity that exists when multiple passes through a phase shift, or NOON states, are used to obtain improved phase resolution. Like a recently introduced adaptive technique (Higgins et al 2007 Nature 450 393), our experiment uses multiple applications of the phase shift on single photons. By not requiring adaptive measurements, but rather using a predetermined measurement sequence, the present scheme is both conceptually simpler and significantly easier to implement. Additionally, we demonstrate a simplified adaptive scheme that also surpasses the standard quantum limit for single passes.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.iop.org/EJ/journal/NJP
Alternative URI http://dx.doi.org/10.1088/1367-2630/11/7/073023
Copyright Statement Copyright 2009 Institute of Physics Publishing. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 11
Page from 073023-1
Page to 073023-14
ISSN 1367-2630
Date Accessioned 2009-09-02
Date Available 2009-12-21T03:15:47Z
Language en_AU
Comments Page numbers are not for citation purposes. Instead, this article has the unique article number of 073023.
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/10072/27827
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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