A Mathematical Justification for the Herman-Kluk Propagator
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- Swart, T. & Rousse, V. Commun. Math. Phys. (2009) 286: 725. doi:10.1007/s00220-008-0681-4
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A class of Fourier Integral Operators which converge to the unitary group of the Schrödinger equation in the semiclassical limit ε → 0 in the uniform operator norm is constructed. The convergence allows for an error bound of order O(ε), which can be improved to arbitrary order in ε upon the introduction of corrections in the symbol. On the Ehrenfest-timescale, the result holds with a slightly weaker error bound. In the chemical literature the approximation is known as the Herman-Kluk propagator.