Quantum-gate characterization in an extended Hilbert space

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Title Quantum-gate characterization in an extended Hilbert space
Author Rohde, Peter P.; Pryde, Geoff; O'Brien, J. L.; Ralph, Timothy C.
Journal Name Physical Review A (Atomic, Molecular and Optical Physics)
Year Published 2005
Place of publication Ridge, NY
Publisher American Physical Society
Abstract We describe an approach for characterizing the process performed by a quantum gate using quantum process tomography, by first modeling the gate in an extended Hilbert space, which includes nonqubit degrees of freedom. To prevent unphysical processes from being predicted, present quantum process tomography procedures incorporate mathematical constraints, which make no assumptions as to the actual physical nature of the system being described. By contrast, the procedure presented here assumes a particular class of physical processes, and enforces physicality by fitting the data to this model. This allows quantum process tomography to be performed using a smaller experimental data set, and produces parameters with a direct physical interpretation. The approach is demonstrated by example of mode matching in an all-optical controlled-NOT gate. The techniques described are general and could be applied to other optical circuits or quantum computing architectures.
Peer Reviewed Yes
Published Yes
Publisher URI http://dx.doi.org/10.1103/PhysRevA.72.032306
Alternative URI http://pra.aps.org/
Copyright Statement Copyright 2005 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal link for access to the definitive, published version.
Volume 72
Issue Number 3
Page from 032306-1
Page to 032306-5
ISSN 1050-2947
Date Accessioned 2006-07-19
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Physical Sciences; PRE2009-Quantum Optics and Lasers
URI http://hdl.handle.net/10072/20989
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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