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Local uncertainty relations serving as measures of entanglement in a bipartite two-level system
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.ORCID iD: 0000-0002-2082-9583
2006 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 73, no 1Article in journal (Refereed) Published
Abstract [en]

We comment on the recent suggestion to use a family of local uncertainty relations as a standard way of quantifying entanglement in two-qubit systems. Some statements made on the applicability of the proposed measures are overly optimistic. We exemplify how these specific measures fall short, and present a minor modification of the general theory which uses the same experimentally gathered information, but in a slightly different, better way.

Place, publisher, year, edition, pages
2006. Vol. 73, no 1
Keyword [en]
quantum-state tomography, discrete wigner function, separability criterion, ensembles, information
URN: urn:nbn:se:kth:diva-15400DOI: 10.1103/PhysRevA.73.012319ISI: 000235008900048ScopusID: 2-s2.0-33144471070OAI: diva2:333441
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Björk, Gunnar
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Microelectronics and Applied Physics, MAP
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