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Diagnosing quantum transport from wave function snapshots
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DOI：10.1103/PhysRevB.110.144204.png)
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摘要
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We study nonequilibrium quantum dynamics of spin chains by employing principal component analysis on data sets of wave function snapshots and examine how information propagates within these data sets. The quantities we employ are derived from the spectrum of the sample second moment matrix, built directly from data sets. Our investigations on several interacting spin chains featuring distinct spin or energy transport reveal that the growth of data information spreading follows the same dynamical exponents as that of the underlying quantum transport of spin or energy. Specifically, our approach enables an easy, data-driven, and, importantly, interpretable diagnostic to track energy transport with a limited number of samples, which is usually challenging without any assumption on the Hamiltonian form. These observations are obtained at a modest finite-size and evolution time, which aligns with experimental and numerical constraints. Our framework directly applies to experimental quantum simulator data sets of dynamics in higher-dimensional systems, where classical simulation methods usually face significant limitations and apply equally to both near- and far-from-equilibrium quenches.
Keyword:
ANOMALOUS SPIN-DIFFUSION
MANY-BODY SYSTEMS
DYNAMICS
HYDRODYNAMICS
TEMPERATURE
期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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