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quant-ph2020★ 45 cited
Free fermions behind the disguise
Samuel J. Elman, Adrian Chapman, Steven T. Flammia
An invaluable method for probing the physics of a quantum many-body spin system is a mapping to noninteracting effective fermions. We find such mappings using only the frustration…
quant-ph2020★ 4 cited
Boundary topological entanglement entropy in two and three dimensions
Jacob C. Bridgeman, Benjamin J. Brown, Samuel J. Elman
The topological entanglement entropy is used to measure long-range quantum correlations in the ground state of topological phases. Here we obtain closed form expressions for topolo…