Measuring a Photonic Qubit without Destroying It

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Title Measuring a Photonic Qubit without Destroying It
Author Pryde, Geoff; O'Brien, J. L.; White, A. G.; Bartlett, S. D.; Ralph, T. C.
Journal Name Physical Review Letters
Year Published 2004
Place of publication Ridge, NY
Publisher American Physical Society
Abstract Measuring the polarization of a single photon typically results in its destruction. We propose, demonstrate, and completely characterize a quantum nondemolition (QND) scheme for realizing such a measurement nondestructively. This scheme uses only linear optics and photodetection of ancillary modes to induce a strong nonlinearity at the single-photon level, nondeterministically. We vary this QND measurement continuously into the weak regime and use it to perform a nondestructive test of complementarity in quantum mechanics. Our scheme realizes the most advanced general measurement of a qubit to date: it is nondestructive, can be made in any basis, and with arbitrary strength.
Peer Reviewed Yes
Published Yes
Publisher URI http://prl.aps.org/
Alternative URI http://dx.doi.org/10.1103/PhysRevLett.92.190402
Copyright Statement Copyright 2004 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 92
Issue Number 19
Page from 190402-1
Page to 190402-4
ISSN 1079-7114
Date Accessioned 2006-06-23
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/10072/15490
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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