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Article: Superbroadcasting and classical information

TitleSuperbroadcasting and classical information
Authors
Issue Date2007
Citation
Physical Review A - Atomic, Molecular, and Optical Physics, 2007, v. 75, n. 1 How to Cite?
AbstractWe address the problem of broadcasting N copies of a generic qubit state to M>N copies by estimating its direction and preparing a suitable output state according to the outcome of the estimate. This semiclassical broadcasting protocol is more restrictive than a general one, since it requires an intermediate step where classical information is extracted and processed. However, we prove that a suboptimal superbroadcasting, namely broadcasting with simultaneous purification of the local output states with respect to the input ones, is possible. We show that in the asymptotic limit of M→ the purification rate converges to the optimal one, proving the conjecture that optimal broadcasting and state estimation are asymptotically equivalent. We also show that it is possible to achieve superbroadcasting with simultaneous inversion of the Bloch vector direction (universal NOT). We prove that in this case the semiclassical procedure of state estimation and preparation turns out to be optimal. We finally analyze semiclassical superbroadcasting in the phase-covariant case. © 2007 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/212904
ISSN
2014 Impact Factor: 2.808
2015 SCImago Journal Rankings: 1.418
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChiribella, Giulio-
dc.contributor.authorD'Ariano, Giacomo M.-
dc.contributor.authorMacChiavello, Chiara-
dc.contributor.authorPerinotti, Paolo-
dc.contributor.authorBuscemi, Francesco-
dc.date.accessioned2015-07-28T04:05:23Z-
dc.date.available2015-07-28T04:05:23Z-
dc.date.issued2007-
dc.identifier.citationPhysical Review A - Atomic, Molecular, and Optical Physics, 2007, v. 75, n. 1-
dc.identifier.issn1050-2947-
dc.identifier.urihttp://hdl.handle.net/10722/212904-
dc.description.abstractWe address the problem of broadcasting N copies of a generic qubit state to M>N copies by estimating its direction and preparing a suitable output state according to the outcome of the estimate. This semiclassical broadcasting protocol is more restrictive than a general one, since it requires an intermediate step where classical information is extracted and processed. However, we prove that a suboptimal superbroadcasting, namely broadcasting with simultaneous purification of the local output states with respect to the input ones, is possible. We show that in the asymptotic limit of M→ the purification rate converges to the optimal one, proving the conjecture that optimal broadcasting and state estimation are asymptotically equivalent. We also show that it is possible to achieve superbroadcasting with simultaneous inversion of the Bloch vector direction (universal NOT). We prove that in this case the semiclassical procedure of state estimation and preparation turns out to be optimal. We finally analyze semiclassical superbroadcasting in the phase-covariant case. © 2007 The American Physical Society.-
dc.languageeng-
dc.relation.ispartofPhysical Review A - Atomic, Molecular, and Optical Physics-
dc.titleSuperbroadcasting and classical information-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevA.75.012315-
dc.identifier.scopuseid_2-s2.0-33846379834-
dc.identifier.volume75-
dc.identifier.issue1-
dc.identifier.eissn1094-1622-
dc.identifier.isiWOS:000243894100042-

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