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PIRSA:14090069

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https://pirsa.org/14090069

Monogamy of entanglement and improved mean-field ansatz for spin lattices

Schuetzhold, R. (2014). Monogamy of entanglement and improved mean-field ansatz for spin lattices. Perimeter Institute for Theoretical Physics. https://pirsa.org/14090069

Ralf Schuetzhold Helmholtz-Zentrum Dresden-Rossendorf

Talk numberPIRSA:14090069
DOI10.48660/14090069
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

We consider rather general spin-1/2 lattices with large coordination numbers Z.
Based on the monogamy of entanglement and other properties of the concurrence C,
we derive rigorous bounds for the entanglement between neighboring spins,
which show that C decreases for large Z. In addition, the concurrence C measures the deviation from mean-field behavior and can only vanish if the mean-field ansatz yields an exact ground state of the Hamiltonian. Motivated by these findings, we propose an improved mean-field ansatz by adding entanglement