Two-site reduced density matrix from one- and two-particle Green's functions

2023/12/21 by Gergő Roósz, Roósz, Gergő, Anna Kauch +7 · 4 citations
Physics and Astronomy · #Advanced Chemical Physics Studies #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.2312.14275

openalex publication_date 2023/12/21 · openalex created_date 2023/12/26 · openalex updated_date 2026/07/28

Abstract

Strongly correlated electron systems are challenging to calculate, and entanglement in such systems is not widely analyzed. We present an approach that can be used as a post-processing step for calculating the two-site reduced density matrix and from it entanglement measures such as the mutual information and entanglement negativity. Input is only the one- and two-particle Green's function which is the output of numerous many-body methods. As an illustration, we present results for a toy model, the Hubbard model on a 2×2 cluster and a 6 site ring.

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