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• W4292707746 abstract "The kicked top is one of the paradigmatic models in the study of quantum chaos~[F.~Haake et al., emph{Quantum Signatures of Chaos (Springer Series in Synergetics vol 54)} (2018)]. Recently it has been shown that the onset of quantum chaos in the kicked top can be related to the proliferation of Trotter errors in digital quantum simulation (DQS) of collective spin systems. Specifically, the proliferation of Trotter errors becomes manifest in expectation values of few-body observables strongly deviating from the target dynamics above a critical Trotter step, where the spectral statistics of the Floquet operator of the kicked top can be predicted by random matrix theory. In this work, we study these phenomena in the framework of Hamiltonian learning (HL). We show how a recently developed Hamiltonian learning protocol can be employed to reconstruct the generator of the stroboscopic dynamics, i.e., the Floquet Hamiltonian, of the kicked top. We further show how the proliferation of Trotter errors is revealed by HL as the transition to a regime in which the dynamics cannot be approximately described by a low-order truncation of the Floquet-Magnus expansion. This opens up new experimental possibilities for the analysis of Trotter errors on the level of the generator of the implemented dynamics, that can be generalized to the DQS of quantum many-body systems in a scalable way. This paper is in memory of our colleague and friend Fritz Haake." @default.
• W4292707746 created "2022-08-23" @default.
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• W4292707746 date "2022-08-19" @default.
• W4292707746 modified "2023-09-25" @default.
• W4292707746 title "Digital quantum simulation, learning of the Floquet Hamiltonian, and quantum chaos of the kicked top" @default.
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• W4292707746 doi "https://doi.org/10.1088/1751-8121/ac8087" @default.
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