Demonstration of an all-optical quantum controlled-NOT gate

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Title Demonstration of an all-optical quantum controlled-NOT gate
Author O'Brien, J. L.; Pryde, Geoff; White, A. G.; Ralph, T. C.; Branning, D.
Journal Name Nature
Year Published 2003
Place of publication London, England
Publisher Nature Publishing Group
Abstract The promise of tremendous computational power, coupled with the development of robust error-correcting schemes, has fuelled extensive efforts to build a quantum computer. The requirements for realizing such a device are confounding: scalable quantum bits (two-level quantum systems, or qubits) that can be well isolated from the environment, but also initialized, measured and made to undergo controllable interactions to implement a universal set of quantum logic gates. The usual set consists of single qubit rotations and a controlled-NOT (CNOT) gate, which flips the state of a target qubit conditional on the control qubit being in the state 1. Here we report an unambiguous experimental demonstration and comprehensive characterization of quantum CNOT operation in an optical system. We produce all four entangled Bell states as a function of only the input qubits' logical values, for a single operating condition of the gate. The gate is probabilistic (the qubits are destroyed upon failure), but with the addition of linear optical quantum non-demolition measurements, it is equivalent to the CNOT gate required for scalable all-optical quantum computation.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.nature.com/nature/index.html
Alternative URI http://dx.doi.org/10.1038/nature02054
Copyright Statement Copyright 2003 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's website for access to the definitive, published version.
Volume 426
Issue Number 6964
Page from 264
Page to 267
ISSN 0028-0836
Date Accessioned 2006-07-18
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/10072/15488
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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