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dc.contributor.authorO'Brien, JL
dc.contributor.authorPryde, GJ
dc.contributor.authorWhite, AG
dc.contributor.authorRalph, TC
dc.contributor.authorBranning, D
dc.date.accessioned2017-05-03T15:07:50Z
dc.date.available2017-05-03T15:07:50Z
dc.date.issued2003
dc.date.modified2009-09-24T05:53:26Z
dc.identifier.issn0028-0836
dc.identifier.doi10.1038/nature02054
dc.identifier.urihttp://hdl.handle.net/10072/15488
dc.description.abstractThe 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.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent236753 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherNature Publishing Group
dc.publisher.placeLondon, England
dc.publisher.urihttp://www.nature.com/nature/index.html
dc.relation.ispartofpagefrom264
dc.relation.ispartofpageto267
dc.relation.ispartofissue6964
dc.relation.ispartofjournalNature
dc.relation.ispartofvolume426
dc.subject.fieldofresearchcode240402
dc.subject.fieldofresearchcode249999
dc.titleDemonstration of an all-optical quantum controlled-NOT gate
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.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.
gro.date.issued2003
gro.hasfulltextFull Text
gro.griffith.authorPryde, Geoff


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