Entanglement tensor for a general pure multipartite quantum state
2005 (English)In: Quantum information & computation, ISSN 1533-7146, Vol. 5, no 2, 146-155 p.Article in journal (Refereed) Published
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.
quantum entanglement, multipartite state, concurrence, separability, systems
IdentifiersURN: urn:nbn:se:kth:diva-14642ISI: 000228023400005ScopusID: 2-s2.0-16244411300OAI: oai:DiVA.org:kth-14642DiVA: diva2:332683
QC 20100525 QC 201109222010-08-052010-08-052013-02-25Bibliographically approved