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Finding Exponential Product Formulas of Higher Orders

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arxiv math-ph/0506007 v1 pith:OMJ2PYAQ submitted 2005-06-02 math-ph cond-mat.stat-mechmath.MPphysics.comp-phquant-ph

Finding Exponential Product Formulas of Higher Orders

classification math-ph cond-mat.stat-mechmath.MPphysics.comp-phquant-ph
keywords exponentialformulashigher-orderproductdecompositionformulaalgorithmsanalysis
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In the present article, we review a continual effort on generalization of the Trotter formula to higher-order exponential product formulas. The exponential product formula is a good and useful approximant, particularly because it conserves important symmetries of the system dynamics. We focuse on two algorithms of constructing higher-order exponential product formulas. The first is the fractal decomposition, where we construct higher-order formulas recursively. The second is to make use of the quantum analysis, where we compute higher-order correction terms directly. As interludes, we also have described the decomposition of symplectic integrators, the approximation of time-ordered exponentials, and the perturbational composition.

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