Quantifying fermionic interactions from the violation of Wick's theorem

TL;DR

This paper introduces a method to quantify fermionic interactions by measuring how much they violate Wick's theorem, linking this violation to entanglement spectrum and interaction distance, thus enabling experimental assessment of interactions.

Contribution

It establishes a novel quantitative framework connecting Wick's theorem violation, entanglement spectrum, and interaction distance in fermionic systems.

Findings

Wick's theorem violation can be expressed via the low entanglement spectrum.

A relation between Wick's violation and interaction distance is established.

The method allows quantification of interactions through measurable quantum correlations.

Abstract

In contrast to interacting systems, the ground state of free systems has a highly ordered pattern of quantum correlations, as witnessed by Wick's decomposition. Here, we quantify the effect of interactions by measuring the violation they cause on Wick's decomposition. In particular, we express this violation in terms of the low entanglement spectrum of fermionic systems. Moreover, we establish a relation between the Wick's theorem violation and the interaction distance, the smallest distance between the reduced density matrix of the system and that of the optimal free model closest to the interacting one. Our work provides the means to quantify the effect of interactions in physical systems though measurable quantum correlations.