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- W3146755071 abstract "We present a framework for understanding the dynamics of operator size, and bounding the growth of out-of-time-ordered correlators, in models of large-$S$ spins. Focusing on the dynamics of a single spin, we show the finiteness of the Lyapunov exponent in the large-$S$ limit; our bounds are tighter than the best known Lieb-Robinson-type bounds on these systems. We numerically find our upper bound on Lyapunov exponents is within an order of magnitude of numerically computed values in classical and quantum kicked top models. Generalizing our results to coupled large-$S$ spins on lattices, we show that the butterfly velocity, which characterizes the spatial speed of quantum information scrambling, is finite as $Sensuremath{rightarrow}ensuremath{infty}$. We emphasize qualitative differences between operator growth in semiclassical large-spin models and quantum holographic systems including the Sachdev-Ye-Kitaev model." @default.
- W3146755071 created "2021-04-13" @default.
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- W3146755071 date "2021-03-17" @default.
- W3146755071 modified "2023-09-26" @default.
- W3146755071 title "Quantum operator growth bounds for kicked tops and semiclassical spin chains" @default.
- W3146755071 hasPublicationYear "2021" @default.
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