The Bures metric near rank-changing points is a coordinate artifact for N=2 but reduces to a conical metric with genuine curvature singularities for N>=3, illustrated by specific Lindblad processes.
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Geometry near rank-changing points on the mixed-state manifold: Bures metric, conical singularities, and Lindblad dynamics
The Bures metric near rank-changing points is a coordinate artifact for N=2 but reduces to a conical metric with genuine curvature singularities for N>=3, illustrated by specific Lindblad processes.