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KAM-Stability for Conserved Quantities in Finite-Dimensional Quantum Systems

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arxiv 2011.04707 v2 pith:A7YUOOLI submitted 2020-11-09 quant-ph

KAM-Stability for Conserved Quantities in Finite-Dimensional Quantum Systems

classification quant-ph
keywords quantumconservedfinite-dimensionalperturbationsquantitiessmallsymmetriessystems
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We show that for any finite-dimensional quantum systems the conserved quantities can be characterized by their robustness to small perturbations: for fragile symmetries small perturbations can lead to large deviations over long times, while for robust symmetries their expectation values remain close to their initial values for all times. This is in analogy with the celebrated Kolmogorov-Arnold-Moser (KAM) theorem in classical mechanics. To prove this remarkable result, we introduce a resummation of a perturbation series, which generalizes the Hamiltonian of the quantum Zeno dynamics.

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  1. Temperature Beyond Equilibrium in Isolated Quantum Many-Body Systems and Their Subsystems

    quant-ph 2026-07 conditional novelty 8.0

    A nonequilibrium temperature is defined as the coordinate of a canonical pseudolocal flow on leaves of fixed energy coherence in the state space of isolated quantum spin chains.