Simplifying quantum logic using higher-dimensional Hilbert spaces

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Title Simplifying quantum logic using higher-dimensional Hilbert spaces
Author Lanyon, Benjamin P.; Barbieri, Marco; Almeida, Marcelo P.; Jennewein, Thomas; Ralph, Timothy C.; Resch, Kevin J.; Pryde, Geoff; O'Brien, Jeremy L.; Gilchrist, Alexei; White, Andrew G.
Journal Name Nature Physics
Year Published 2009
Place of publication United Kingdom
Publisher Nature Publishing Group
Abstract Quantum computation promises to solve fundamental, yet otherwise intractable, problems across a range of active fields of research. Recently, universal quantum logic-gate sets—the elemental building blocks for a quantum computer—have been demonstrated in several physical architectures. A serious obstacle to a full-scale implementation is the large number of these gates required to build even small quantum circuits. Here, we present and demonstrate a general technique that harnesses multi-level information carriers to significantly reduce this number, enabling the construction of key quantum circuits with existing technology. We present implementations of two key quantum circuits: the three-qubit Toffoli gate and the general two-qubit controlled-unitary gate. Although our experiment is carried out in a photonic architecture, the technique is independent of the particular physical encoding of quantum information, and has the potential for wider application.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1038/NPHYS1150
Copyright Statement Copyright 2009 Nature Publishing Group. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
Volume 5
Issue Number 2
Page from 134
Page to 140
ISSN 1745-2473
Date Accessioned 2009-11-11
Date Available 2010-10-13T10:00:45Z
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject PRE2009-Quantum Optics and Lasers
URI http://hdl.handle.net/10072/30259
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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