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- W4287284916 abstract "We prove that the entanglement entropy of the ground state of a locally gapped frustration-free 2D lattice spin system satisfies an area law with respect to a vertical bipartition of the lattice into left and right regions. We first establish that the ground state projector of any locally gapped frustration-free 1D spin system can be approximated to within error $epsilon$ by a degree $O(sqrt{nlog(epsilon^{-1})})$ multivariate polynomial in the interaction terms of the Hamiltonian. This generalizes the optimal bound on the approximate degree of the boolean AND function, which corresponds to the special case of commuting Hamiltonian terms. For 2D spin systems we then construct an approximate ground state projector (AGSP) that employs the optimal 1D approximation in the vicinity of the boundary of the bipartition of interest. This AGSP has sufficiently low entanglement and error to establish the area law using a known technique." @default.
- W4287284916 created "2022-07-25" @default.
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- W4287284916 date "2021-03-03" @default.
- W4287284916 modified "2023-09-23" @default.
- W4287284916 title "An area law for 2D frustration-free spin systems" @default.
- W4287284916 doi "https://doi.org/10.48550/arxiv.2103.02492" @default.
- W4287284916 hasPublicationYear "2021" @default.
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