Preprint
Aug 2026
Krylov Break Times from an Inhomogeneous Lieb--Robinson Light Cone
Krylov and Lanczos approximations are used in quantum dynamics, quantum subspace methods, and Hamiltonian learning. A practical question is how long an $m$-dimensional Krylov truncation can be trusted. We argue that this time is fixed by causal propagation on the associated Jacobi chain. The relevant distance is not th...
Shunji Matsuura, Yoji Kawamura, J. Salfi et al.
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