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Proceedings Paper

Optical measurements using projection synthesis
Author(s): Lee S. Phillips; Stephen M. Barnett; David T. Pegg
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Paper Abstract

We present an extension of the projection synthesis technique which allows, at least in principle, the determination of the probability distribution of any physical observable of a quantized optical field mode. This involves directly measuring a quantity proportional to the squared modulus of the projection of an input pure state onto the eigenstate associated with the observable to be measured. It is found that we need to synthesize a specific reference state conditioned upon the property under investigation. A general expression for these reference states is given. We provide the specific reference states needed to synthesize a measurement of canonical phase. A variant on homodyne detection is investigated using projection synthesis and we form the probability operator measure (POM) required to characterize the measurement. The POM is not that which is formed in conventional balanced homodyne detection. As an application, we utilize these results to form the POM and a quasi probability distribution function associated with a measurement scheme used to distinguish between nonorthogonal coherent states.

Paper Details

Date Published: 6 July 1998
PDF: 8 pages
Proc. SPIE 3385, Photonic Quantum Computing II, (6 July 1998); doi: 10.1117/12.312645
Show Author Affiliations
Lee S. Phillips, Univ. of Strathclyde (United Kingdom)
Stephen M. Barnett, Univ. of Strathclyde (United Kingdom)
David T. Pegg, Griffith Univ. (Australia)

Published in SPIE Proceedings Vol. 3385:
Photonic Quantum Computing II
Steven P. Hotaling; Andrew R. Pirich, Editor(s)

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