Abstract
We present a kinematic approach for obtaining the geometric phase of a mixed state under nonunitary evolution. This phase is gauge-invariant and measurable and leads to well-known results for unitary evolution.
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Kwek, L.C., Tong, D.M., Chen, J.L. et al. Geometric phase for mixed states. Laser Phys. 16, 398–401 (2006). https://doi.org/10.1134/S1054660X06020344
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DOI: https://doi.org/10.1134/S1054660X06020344