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Entanglement tensor for a general pure multipartite quantum state
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.ORCID iD: 0000-0002-2082-9583
2005 (English)In: Quantum information & computation, ISSN 1533-7146, Vol. 5, no 2, 146-155 p.Article in journal (Refereed) Published
Abstract [en]

We propose an entanglement tensor to quantitatively compute the entanglement of a general pure multipartite quantum state. We compare the ensuing tensor with the concurrence for bipartite state and apply the tensor measure to some interesting examples of entangled three-qubit and four-qubit states. It is shown that in defining the degree of entanglement of a multi-partite state, one needs to make assumptions about the willingness of the parties to cooperate. For such states our tensor becomes a measure of generalized entanglement of assistance. We also discuss the degree of entanglement and the concurrence of assistance of two generic multi-qubit states.

Place, publisher, year, edition, pages
2005. Vol. 5, no 2, 146-155 p.
Keyword [en]
quantum entanglement, multipartite state, concurrence, separability, systems
Identifiers
URN: urn:nbn:se:kth:diva-14642ISI: 000228023400005Scopus ID: 2-s2.0-16244411300OAI: oai:DiVA.org:kth-14642DiVA: diva2:332683
Note

QC 20100525 QC 20110922

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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Björk, Gunnar

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