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Numerical analysis of entanglement properties of density matrices in C-2 circle times C-2 systems
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
2002 (English)In: Quantum information & computation, ISSN 1533-7146, Vol. 2, no 3, 222-239 p.Article in journal (Refereed) Published
Abstract [en]

Quantum entanglement is an enigmatic and powerful property that has attracted much attention due to its usefulness in new ways of communications, like quantum teleportation and quantum key distribution. Much effort has been done to quantify entanglement. Indeed, there exist some well-established separability criterion and analytical formulas for the entanglement of bipartite systems. In both, the crucial element is the partial transpose of the density matrix. In this paper, we show numerically that one can also have information about the entanglement of bipartite state, in C(2)circle timesC(2), without looking at the partial transpose. We furthermore study properties of disentanglement operation, as well as properties of the relative entropy.

Place, publisher, year, edition, pages
2002. Vol. 2, no 3, 222-239 p.
Keyword [en]
Density Matrix, quantum entanglement measures and separability criterion, random unitary matrices, separability, state
URN: urn:nbn:se:kth:diva-21854ISI: 000177696400005OAI: diva2:340552
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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