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- W2116735571 abstract "We study the nonequilibrium dynamics of correlations in quantum lattice models in the presence of long-range interactions decaying asymptotically as a power law. For exponents larger than the lattice dimensionality, a Lieb-Robinson-type bound effectively restricts the spreading of correlations to a causal region, but allows supersonic propagation. We show that this decay is not only sufficient but also necessary. Using tools of quantum metrology, for any exponents smaller than the lattice dimension, we construct Hamiltonians giving rise to quantum channels with capacities not restricted to a causal region. An analytical analysis of long-range Ising models illustrates the disappearance of the causal region and the creation of correlations becoming distance independent. Numerical results obtained using matrix product state methods for the $XXZ$ spin chain reveal the presence of a sound cone for large exponents and supersonic propagation for small ones. In all models we analyzed, the fast spreading of correlations follows a power law, but not the exponential increase of the long-range Lieb-Robinson bound." @default.
- W2116735571 created "2016-06-24" @default.
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- W2116735571 date "2013-12-26" @default.
- W2116735571 modified "2023-10-16" @default.
- W2116735571 title "Breakdown of Quasilocality in Long-Range Quantum Lattice Models" @default.
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- W2116735571 doi "https://doi.org/10.1103/physrevlett.111.260401" @default.
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