A multilevel quantum system interacting with an intense laser Seld is shown to exhibit many invariants, or constants of evolution, under various conditions. Our results also apply to other similar physical problems.
Hioe, Foek T. and Carroll, C. E. (1988). "Coherent population trapping in N-level quantum systems." Physical Review A 37.8, 3000-3005.
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©1988, The American Physical Society. Original publication is available at http://link.aps.org/doi/10.1103/PhysRevA.37.3000