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quant-ph2025
Ground and excited-state energies with analytic errors and short time evolution on a quantum computer
Timothy Stroschein, Davide Castaldo, Markus Reiher
Accurately solving the Schrödinger equation remains a central challenge in computational physics, chemistry, and materials science. Here, we propose an alternative eigenvalue probl…
math.NA2025
Local spectral approximation of unbounded operators: non-asymptotic and unified error quantification for subspace methods
Timothy Stroschein
We introduce a framework for subspace methods which approximate the spectra of self-adjoint, unbounded operators in a local region. Using the projection-valued measure, we derive i…