Increasing the local spin in the mixed-field Ising chain opens an exponential (Lyapunov) growth window in the commutator squared, and the extracted rate matches the classical Poisson-bracket Lyapunov exponent in the infinite-spin limit.
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Lyapunov growth in quantum spin chains
Increasing the local spin in the mixed-field Ising chain opens an exponential (Lyapunov) growth window in the commutator squared, and the extracted rate matches the classical Poisson-bracket Lyapunov exponent in the infinite-spin limit.