Minimum-error discrimination of entangled quantum states

Strategies to optimally discriminate between quantum states are critical in quantum technologies. We present an experimental demonstration of minimum error discrimination between entangled states, encoded in the polarization of pairs of photons. Although the optimal measurement involves projecting o...

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Bibliographic Details
Published in:arXiv.org 2010-08
Main Authors: Lu, Yang, Coish, Nick, Kaltenbaek, Rainer, Hamel, Deny R, Croke, Sarah, Resch, Kevin J
Format: Article
Language:English
Subjects:
Coding
Discrimination
Entangled states
Errors
Optimization
Photons
Polarization
Quantum theory
Online Access:Get full text
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Summary:Strategies to optimally discriminate between quantum states are critical in quantum technologies. We present an experimental demonstration of minimum error discrimination between entangled states, encoded in the polarization of pairs of photons. Although the optimal measurement involves projecting onto entangled states, we use a result of Walgate et al. to design an optical implementation employing only local polarization measurements and feed-forward, which performs at the Helstrom bound. Our scheme can achieve perfect discrimination of orthogonal states and minimum error discrimination of non-orthogonal states. Our experimental results show a definite advantage over schemes not using feed-forward.
ISSN:2331-8422
DOI:10.48550/arxiv.1008.0843