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Geodesics and the best measurement for distinguishing quantum states
Stockholm University, Faculty of Science, Department of Physics.
2005 In: Journal of physics. A, Mathematical and general, ISSN 0305-4470, Vol. 38, L725-L730 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2005. Vol. 38, L725-L730 p.
URN: urn:nbn:se:su:diva-24391OAI: diva2:197431
Part of urn:nbn:se:su:diva-6993Available from: 2007-08-15 Created: 2007-08-15Bibliographically approved
In thesis
1. Exploring the Set of Quantum States
Open this publication in new window or tab >>Exploring the Set of Quantum States
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Quantum mechanical properties of finite dimensional quantum systems are used within the field of quantum information. In this thesis the set of states (density matrices) for such systems is studied and described, largely in geometrical terms. The introductory part also acquaints the reader with relevant background about majorization, bistochastic matrices, mutually unbiased bases, Hadamard matrices and entanglement, with the aim to make the papers attached easier to read.

Paper I considers Peres' criterion for separability, for two qubit states. Paper II deals with the problem of how density matrices can be mixed from pure states, especially what probability distributions over pure states that are possible. In Paper III the set of bistochastic matrices–Birkhoff's polytope–and the subset of unistochastic matrices is studied, with a detailed description in dimensions 3 and 4. In Paper IV it is seen how the states of a complete set of mutually unbiased bases form a polytope in the set of density matrices, with certain combinatorial properties. A search for mutually unbiased bases in dimension 6 is presented in Paper VI, which includes a thorough discussion on 6 by 6 Hadamard matrices. Paper V presents a result about geodesics in the set of quantum states with respect to the curved Bures-Uhlmann geometry.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2007. 82 p.
quantum mechanics, quantum states, density matrices, quantum information, geometry
National Category
Physical Sciences
Research subject
Theoretical Physics
urn:nbn:se:su:diva-6993 (URN)978-91-7155-475-8 (ISBN)
Public defence
2007-09-17, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00
Available from: 2007-08-15 Created: 2007-08-15Bibliographically approved

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