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dc.contributor.authorWiseman, Howarden_US
dc.date.accessioned2017-04-24T08:47:35Z
dc.date.available2017-04-24T08:47:35Z
dc.date.issued2004en_US
dc.date.modified2009-10-08T06:29:39Z
dc.identifier.issn14644266en_US
dc.identifier.doi10.1088/1464-4266/6/8/035en_AU
dc.identifier.urihttp://hdl.handle.net/10072/5722
dc.description.abstractIt 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 堣an synchronize M independent clocks each with a mean-square error of .en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent163885 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherInstitute of Physics Publishingen_US
dc.publisher.placeUKen_US
dc.publisher.urihttp://www.iop.org/EJ/journal/JOptBen_AU
dc.relation.ispartofpagefromS849en_US
dc.relation.ispartofpagetoS859en_US
dc.relation.ispartofjournalJournal of Optics B: Quantum and Semiclassical Opticsen_US
dc.relation.ispartofvolume6en_US
dc.subject.fieldofresearchcode240402en_US
dc.titleDefending continuous variable teleportation: Why a laser is a clock, not a quantum channelen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 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.en_AU
gro.date.issued2004
gro.hasfulltextFull Text


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