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Entanglement measure for pure M circle times N bipartite quantum states
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0002-2082-9583
2005 (English)In: Optics and Spectroscopy, ISSN 0030-400X, E-ISSN 1562-6911, Vol. 99, no 3, 379-385 p.Article in journal (Refereed) Published
Abstract [en]

We propose an entanglement measure for pure M circle times N bipartite quantum states. We obtain the measure by generalizing the equivalent measure for a 2 circle times 2 system, via a 2 circle times 3 system, to the general bipartite case. The measure emphasizes the role Bell states have, both for forming the measure and for experimentally measuring the entanglement. The form of the measure is similar to the generalized concurrence. In the case of 2 circle times 3 systems, we prove that our measure, which is directly measurable, equals the concurrence. It is also shown that, in order to measure the entanglement, it is sufficient to measure the projections of the state onto a maximum of M(M-1)N(N-1)/2 Bell states.

Place, publisher, year, edition, pages
2005. Vol. 99, no 3, 379-385 p.
Keyword [en]
separability, operator
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-15110DOI: 10.1134/1.2055931ISI: 000232544400006Scopus ID: 2-s2.0-27944445423OAI: oai:DiVA.org:kth-15110DiVA: diva2:333151
Note

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2014-12-01Bibliographically approved

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Björk, Gunnar

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