Defending continuous variable teleportation: Why a laser is a clock, not a quantum channel

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Title Defending continuous variable teleportation: Why a laser is a clock, not a quantum channel
Author Wiseman, Howard Mark
Journal Name Journal of Optics B: Quantum and Semiclassical Optics
Year Published 2004
Place of publication UK
Publisher Institute of Physics Publishing
Abstract It has been argued (Rudolph and Sanders 2001 Phys. Rev. Lett. 87 077903) that continuous-variable quantum teleportation at optical frequencies has not been achieved because the source used (a laser) was not 'truly coherent'. Van Enk and Fuchs (2002 Phys. Rev. Lett. 88 027902), while arguing against Rudolph and Sanders, also accept that an 'absolute phase' is achievable, even if it has not been achieved yet. I will argue to the contrary that 'true coherence' or 'absolute phase' is always illusory, as the concept of absolute time (at least for frequencies beyond direct human experience) is meaningless. All we can ever do is to use an agreed time standard. In this context, a laser beam is fundamentally as good a 'clock' as any other. I explain in detail why this claim is true, and defend my argument against various objections. In the process I discuss super-selection rules, quantum channels, and the ultimate limits to the performance of a laser as a clock. For this last topic I use some earlier work by myself (1999 Phys. Rev. A 60 4083) and Berry and myself (2002 Phys. Rev. A 65 043803) to show that a Heisenberg-limited laser with a mean photon number μ can synchronize M independent clocks each with a mean-square error of .
Peer Reviewed Yes
Published Yes
Publisher URI http://www.iop.org/EJ/journal/JOptB
Alternative URI http://dx.doi.org/10.1088/1464-4266/6/8/035
Copyright Statement Copyright 2004 Institute of Physics Publishing. 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 6
Page from S849
Page to S859
ISSN 1464-4266
Date Accessioned 2005-03-07
Date Available 2009-10-08T06:29:39Z
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Quantum Optics and Lasers
URI http://hdl.handle.net/10072/5722
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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