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- W4296127338 abstract "Ground-state entanglement governs various properties of quantum many-body systems at low temperatures and is the key to understanding gapped quantum phases of matter. Here we identify a structural property of entanglement in the ground state of gapped local Hamiltonians. This property is captured using a quantum information quantity known as the entanglement spread, which measures the difference between Rényi entanglement entropies. Our main result shows that gapped ground states possess limited entanglement spread across any partition of the system, exhibiting an area-law scaling. Our result applies to systems with interactions described by any graph, but we obtain an improved bound for the special case of lattices. These interaction graphs include cases where entanglement entropy is known not to satisfy an area law. We achieve our results first by connecting the ground-state entanglement to the communication complexity of testing bipartite entangled states and then devising a communication scheme for testing ground states using recently developed quantum algorithms for Hamiltonian simulation. Entanglement entropy between two parts of a quantum state generally grows with volume, but for one-dimensional and some two-dimensional ground states, it scales with area. An area law has now been proven for a related metric in any dimension or geometry." @default.
- W4296127338 created "2022-09-17" @default.
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- W4296127338 date "2022-09-15" @default.
- W4296127338 modified "2023-09-28" @default.
- W4296127338 title "Entanglement spread area law in gapped ground states" @default.
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- W4296127338 doi "https://doi.org/10.1038/s41567-022-01740-7" @default.
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