Blume-Kohout, R., Croke, S. and Zwolak, M. (2013) Quantum data gathering. Scientific Reports, 3, 1800. (doi: 10.1038/srep01800) (PMCID:PMC3653145)
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Abstract
Measurement of a quantum system – the process by which an observer gathers information about it – provides a link between the quantum and classical worlds. The nature of this process is the central issue for attempts to reconcile quantum and classical descriptions of physical processes. Here, we show that the conventional paradigm of quantum measurement is directly responsible for a well-known disparity between the resources required to extract information from quantum and classical systems. We introduce a simple form of quantum data gathering, “coherent measurement”, that eliminates this disparity and restores a pleasing symmetry between classical and quantum statistical inference. To illustrate the power of quantum data gathering, we demonstrate that coherent measurements are optimal and strictly more powerful than conventional one-at-a-time measurements for the task of discriminating quantum states, including certain entangled many-body states (e.g., matrix product states).
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Croke, Dr Sarah |
Authors: | Blume-Kohout, R., Croke, S., and Zwolak, M. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | Scientific Reports |
Publisher: | Nature Publishing Group |
ISSN: | 2045-2322 |
ISSN (Online): | 2045-2322 |
Copyright Holders: | Copyright © 2013 The Authors |
First Published: | First published in Scientific Reports 3:1800 |
Publisher Policy: | Reproduced under a Creative Commons License |
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