Calculation of reduced density matrices from correlation functions

TL;DR

This paper demonstrates a method to derive reduced density matrices directly from correlation functions in solvable lattice systems, simplifying their computation for use in density-matrix renormalization group techniques.

Contribution

It introduces a straightforward approach to obtain reduced density matrices from correlation functions in solvable fermionic and bosonic lattice models.

Findings

Reduced density matrices can be derived from correlation functions in solvable systems.

The method simplifies calculations used in density-matrix renormalization group.

Applicable to both fermionic and bosonic lattice systems.

Abstract

It is shown that for solvable fermionic and bosonic lattice systems, the reduced density matrices can be determined from the properties of the correlation functions. This provides the simplest way to these quantities which are used in the density-matrix renormalization group method.