Entanglement entropy bounds for pure states of rapid decorrelation

• URL: http://arxiv.org/abs/2406.10194v1
• Date: Fri, 14 Jun 2024 17:28:03 GMT
• Title: Entanglement entropy bounds for pure states of rapid decorrelation
• Authors: Michael Aizenman, Simone Warzel,
• Abstract summary: We construct high fidelity approximations of relatively low complexity for pure states of quantum lattice systems. The applicability of the general results is demonstrated on the quantum Ising model in transverse field. We establish an area-law type bound on the entanglement in the model's subcritical ground states, valid in all dimensions and up to the model's quantum phase transition.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: For pure states of multi-dimensional quantum lattice systems, which in a convenient computational basis have amplitude and phase structure of sufficiently rapid decorrelation, we construct high fidelity approximations of relatively low complexity. These are used for a conditional proof of area-law bounds for the states' entanglement entropy. The condition is also shown to imply exponential decay of the state's mutual information between disjoint regions, and hence exponential clustering of local observables. The applicability of the general results is demonstrated on the quantum Ising model in transverse field. Combined with available model-specific information on spin-spin correlations, we establish an area-law type bound on the entanglement in the model's subcritical ground states, valid in all dimensions and up to the model's quantum phase transition.

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