Quantum data gathering

Blume-Kohout, R., Croke, S. and Zwolak, M. (2013) Quantum data gathering. Scientific Reports, 3, 1800. (doi: 10.1038/srep01800) (PMCID:PMC3653145)

89032.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.



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
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 (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

University Staff: Request a correction | Enlighten Editors: Update this record