Abstract
We present a simple derivation of the matrix Riccati equations governing the reduced dynamics as one descends from the group \( \mathbb{U} \)(N) describing the Schrödinger evolution of an N-level quantum system to the various coset spaces and Grassmanian manifolds associated with it. The special case pertaining to the geometric phase in N-level systems is described in detail. Further, we show how the matrix Riccati equation thus obtained can be reformulated as an equation describing Hamiltonian evolution in a classical phase space and establish correspondences between the two descriptions.
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Chaturvedi, S., Ercolessi, E., Marmo, G. et al. Ray space ‘Riccati’ evolution and geometric phases for N-level quantum systems. Pramana - J Phys 69, 317–327 (2007). https://doi.org/10.1007/s12043-007-0135-0
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DOI: https://doi.org/10.1007/s12043-007-0135-0