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Quantifying entanglement with scattering experiments
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DOI：10.1103/PhysRevB.89.125117.png)
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Abstract
En 中文
We show how the entanglement contained in states of spins arranged on a lattice may be lower bounded with observables arising in scattering experiments. We focus on the partial differential cross section obtained in neutron scattering from magnetic materials but our results are sufficiently general such that they may also be applied to, e.g., optical Bragg scattering from ultracold atoms in optical lattices or from ion chains. We discuss resonating valence bond states and ground and thermal states of experimentally relevant models-such as the Heisenberg, Majumdar-Ghosh, and XY models-in different geometries and with different spin numbers. As a by-product, we find that for the one-dimensional XY model in a transverse field such measurements reveal factorization and the quantum phase transition at zero temperature.
Keywords:
CRITICAL MAGNETIC SCATTERING
SPIN-CORRELATION FUNCTIONS
HEISENBERG-ANTIFERROMAGNET
QUANTUM
STATE
CHAIN
EXCITATIONS
DYNAMICS
ENTROPY
LA2CUO4
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