A Heisenberg-picture series of time-independent commutators and nested pulse integrals yields propagator gradients for arbitrary pulse shapes, giving >10× speedup over GOAT on local multi-qubit GHZ tasks.
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Analytical Series Expansion for Efficient Gradient Evaluation in Multi-Qubit Optimal Control
A Heisenberg-picture series of time-independent commutators and nested pulse integrals yields propagator gradients for arbitrary pulse shapes, giving >10× speedup over GOAT on local multi-qubit GHZ tasks.