Link representation of the entanglement entropies for all bipartitions

• URL: http://arxiv.org/abs/2103.08929v1
• Date: Tue, 16 Mar 2021 09:17:41 GMT
• Title: Link representation of the entanglement entropies for all bipartitions
• Authors: Sudipto Singha Roy, Silvia N. Santalla, Germ\'an Sierra, Javier Rodr\'iguez-Laguna
• Abstract summary: We show that the entanglement entropy of any bipartition of a quantum state can be approximated as the sum of certain link strengths connecting internal and external sites. We propose several approximation techniques for matrix product states, free fermionic states, or in cases in which contiguous blocks are specially relevant.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We have recently shown that the entanglement entropy of any bipartition of a quantum state can be approximated as the sum of certain link strengths connecting internal and external sites. The representation is useful to unveil the geometry associated with the entanglement structure of a quantum many-body state which may occasionally differ from the one suggested by the Hamiltonian of the system. Yet, the obtention of these entanglement links is a complex mathematical problem. In this work, we address this issue and propose several approximation techniques for matrix product states, free fermionic states, or in cases in which contiguous blocks are specially relevant. Along with this, we discuss the accuracy of the approximation for different types of states and partitions. Finally, we employ the link representation to discuss two different physical systems: the spin-1/2 long-range XXZ chain and the spin-1 bilinear biquadratic chain.

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