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Higher Order Decompositions of Ordered Operator Exponentials

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arxiv 0812.0562 v3 pith:EJVV2ZJT submitted 2008-12-02 math-ph math.MPquant-ph

classification math-phmath.MPquant-ph
keywords functionsoperatorproductdifferentiableexponentialsformulaeinfinitelylie-trotter-suzuki
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We present a decomposition scheme based on Lie-Trotter-Suzuki product formulae to represent an ordered operator exponential as a product of ordinary operator exponentials. We provide a rigorous proof that does not use a time-displacement superoperator, and can be applied to non-analytic functions. Our proof provides explicit bounds on the error and includes cases where the functions are not infinitely differentiable. We show that Lie-Trotter-Suzuki product formulae can still be used for functions that are not infinitely differentiable, but that arbitrary order scaling may not be achieved.

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  1. Benchmarking trigonometric continuous-variable gate primitives with trapped ions

    quant-ph 2026-07 conditional novelty 6.0 of 10

    Cosine gates exp(-iθ cos(c x̂)) in one- and two-mode versions were implemented on trapped-ion motional modes and benchmarked against noise-inclusive simulations via Fock-space transition probabilities.

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