Kinematic approach to off-diagonal geometric phases of nondegenerate and degenerate mixed states

D. M. Tong; Erik Sjöqvist; Stefan Filipp; L. C. Kwek; C. H. Oh

doi:10.1103/PhysRevA.71.032106

Kinematic approach to off-diagonal geometric phases of nondegenerate and degenerate mixed states

D. M. Tong, Erik Sjöqvist, Stefan Filipp, L. C. Kwek, C. H. Oh

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14 Scopus citations

Abstract

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.

Original language	English
Article number	032106
Journal	Physical Review A
Volume	71
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevA.71.032106
State	Published - 1 Mar 2005
Externally published	Yes

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Kinematic approach to off-diagonal geometric phases of nondegenerate and degenerate mixed states

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