Physics – Quantum Physics
Scientific paper
2004-05-11
Phys. Rev. A 71, 032106 (2005)
Physics
Quantum Physics
New section IV, new figure, journal ref added
Scientific paper
10.1103/PhysRevA.71.032106
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. {\bf 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.
Filipp Stefan
Kwek Leong Chuan
Oh Chang-Heon
Sjöqvist Erik
Tong Dian-Min
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