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Kinematic approach to off-diagonal geometric phases of nondegenerate and degenerate mixed states
Dept. of Physics, NUS, Singapore.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry, Quantum Chemistry. (Quantum information theory)
Atominstitut, Vienna, Austria.
Dept. of Physics, NUS, Singapore.
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2005 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 71, no 3, 032106- p.Article in journal (Refereed) Published
Abstract [en]

Off-diagonal geometric phases have been developed in order to provide information of the geometry of paths that connect noninterfering quantal states. We propose a kinematic approach to off-diagonal geometric phases for pure and mixed states. We further extend the mixed state concept proposed in [Phys. Rev. Lett. 90, 050403 (2003)] to degenerate density operators. The first and second order off-diagonal geometric phases are analyzed for unitarily evolving pairs of pseudopure states.

Place, publisher, year, edition, pages
2005. Vol. 71, no 3, 032106- p.
Keyword [en]
Geometric phase, mixed quantumm states
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:uu:diva-73761DOI: 10.1103/PhysRevA.71.032106OAI: oai:DiVA.org:uu-73761DiVA: diva2:101671
Available from: 2006-12-18 Created: 2006-12-18 Last updated: 2011-10-05

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Sjöqvist, Erik

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