The authors report that adding second-order Zassenhaus commutator corrections to a Cartan/KAK fixed-depth ansatz yields small simulation errors on six spin models, with a claimed local error of O(t^3).
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Zassenhaus Expansion in Solving the Schr\"odinger Equation
The authors report that adding second-order Zassenhaus commutator corrections to a Cartan/KAK fixed-depth ansatz yields small simulation errors on six spin models, with a claimed local error of O(t^3).