most citedGround and excited-state energies with analytic errors and short time evolution on a quantum computer

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math.NA2026

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…