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Dynamical error bounds for continuum discretisation via Gauss quadrature rules - a Lieb-Robinson bound approach

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Instances of discrete quantum systems coupled to a continuum of oscillators are ubiquitous in physics. Often the continua are approximated by a discrete set of modes. We derive analytical error bounds on expectation values of system observables that have been time evolved under such discretised Hamiltonians. These bounds take on the form of a function of time and the number of discrete modes, where the discrete modes are chosen according to Gauss quadrature rules. The derivation makes use of tools from the field of Lieb-Robinson bounds and the theory of orthonormal polynominals. This field has received considerable attention over the years from numerical studies, but our results constitute the first analytical bounds. A preprint can be found at arxiv.org/abs/1508.07354

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