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Kinematic approach to the mixed state geometric phase in nonunitary evolution
D M Tong1, E Sjöqvist, L C Kwek
1Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.
Physical Review Letters
|September 28, 2004
Abstract:
A kinematic approach to the geometric phase for mixed quantal states in nonunitary evolution is proposed. This phase is manifestly gauge invariant and can be experimentally tested in interferometry. It leads to well-known results when the evolution is unitary.