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Article: Local measurements are sufficient to obtain maximal information on independently prepared quantum states

TitleLocal measurements are sufficient to obtain maximal information on independently prepared quantum states
Authors
Issue Date2008
PublisherAmerican Physical Society. The Journal's web site is located at http://pra.aps.org
Citation
Physical Review A - Atomic, Molecular, And Optical Physics, 2008, v. 78 n. 6 How to Cite?
AbstractGiven a composite quantum system in which the states of the subsystems are independently (but not necessarily identically) prepared, we construct separate measurements on the subsystems from any given joint measurement such that the former always give at least as much information as the latter. This construction offers insights into the understanding of measurements on this type of composite system. Moreover, this construction essentially proves the intuition that separate measurements on the subsystems are sufficient to extract the maximal information about the separately prepared subsystems, thus making a joint measurement unnecessary. Furthermore, our result implies that individual attacks are as powerful as collective attacks in obtaining information about the raw key in quantum key distribution. © 2008 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/59631
ISSN
2014 Impact Factor: 2.808
2015 SCImago Journal Rankings: 1.418
ISI Accession Number ID
Funding AgencyGrant Number
RGC of the HKSAR GovernmentHKU 701007P
NSERC of Canada
Funding Information:

We thank Debbie W. Leung, Hoi-Kwong Lo, Xiongfeng Ma, Marco Piani, and Ming-Yong Ye for enlightening discussions. This work is supported by the RGC Grant No. HKU 701007P of the HKSAR Government and NSERC of Canada.

References
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DC FieldValueLanguage
dc.contributor.authorFung, CHFen_HK
dc.contributor.authorChau, HFen_HK
dc.date.accessioned2010-05-31T03:54:09Z-
dc.date.available2010-05-31T03:54:09Z-
dc.date.issued2008en_HK
dc.identifier.citationPhysical Review A - Atomic, Molecular, And Optical Physics, 2008, v. 78 n. 6en_HK
dc.identifier.issn1050-2947en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59631-
dc.description.abstractGiven a composite quantum system in which the states of the subsystems are independently (but not necessarily identically) prepared, we construct separate measurements on the subsystems from any given joint measurement such that the former always give at least as much information as the latter. This construction offers insights into the understanding of measurements on this type of composite system. Moreover, this construction essentially proves the intuition that separate measurements on the subsystems are sufficient to extract the maximal information about the separately prepared subsystems, thus making a joint measurement unnecessary. Furthermore, our result implies that individual attacks are as powerful as collective attacks in obtaining information about the raw key in quantum key distribution. © 2008 The American Physical Society.en_HK
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://pra.aps.orgen_HK
dc.relation.ispartofPhysical Review A - Atomic, Molecular, and Optical Physicsen_HK
dc.rightsPhysical Review A (Atomic, Molecular and Optical Physics). Copyright © American Physical Society.en_HK
dc.titleLocal measurements are sufficient to obtain maximal information on independently prepared quantum statesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0556-2791&volume=78&spage=062308: 1&epage=5&date=2008&atitle=Local+measurements+are+sufficient+to+obtain+maximal+information+on+independently+prepared+quantum+statesen_HK
dc.identifier.emailChau, HF: hfchau@hku.hken_HK
dc.identifier.authorityChau, HF=rp00669en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevA.78.062308en_HK
dc.identifier.scopuseid_2-s2.0-57449099041en_HK
dc.identifier.hkuros153982en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-57449099041&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume78en_HK
dc.identifier.issue6en_HK
dc.identifier.eissn1094-1622-
dc.identifier.isiWOS:000262242400048-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectProperties And Applications Of Quantum Low Density Parity Check And Related Codes-
dc.identifier.scopusauthoridFung, CHF=8201367800en_HK
dc.identifier.scopusauthoridChau, HF=7005742276en_HK

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