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Non-universal level statistics in a chaotic quantum spin chain

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arxiv quant-ph/0702164 v1 pith:SCMCVBJZ submitted 2007-02-15 quant-ph

classification quant-ph
keywords levelstatisticssystemchainclassicaleffectsmatrixnon-universal
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We study the level statistics of an interacting multi-qubit system, namely the kicked Ising spin chain, in the regime of quantum chaos. Long range quasi-energy level statistics show effects analogous to the ones observed in semi-classical systems due to the presence of classical periodic orbits, while short range level statistics display perfect statistical agreement with random matrix theory. Even though our system possesses no classical limit, our result suggest existence of an important non-universal system specific behavior at short time scale, which clearly goes beyond finite size effects in random matrix theory.

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  1. Streamlined Krylov construction and classification of ergodic Floquet systems

    quant-ph 2024-12 conditional novelty 7.0 of 10

    A Szegő/CMV Krylov construction maps Floquet unitary dynamics to a five-diagonal chain, with a conjectured classification of chaos and integrability by Verblunsky coefficient asymptotics.

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