Area law of non-critical ground states in 1D long-range interacting systems

TL;DR

This paper proves that the area law for entanglement entropy holds for generic non-critical 1D ground states with long-range interactions, ensuring efficient simulation methods like matrix-product states are applicable.

Contribution

It establishes the robustness of the area law in non-critical 1D systems with long-range interactions, a result previously uncertain due to correlation complexities.

Findings

Area law holds for non-critical 1D long-range systems.

Matrix-product states efficiently describe these ground states.

Supports the validity of density-matrix renormalization in such systems.

Abstract

The area law for entanglement provides one of the most important connections between information theory and quantum many-body physics. It is not only related to the universality of quantum phases, but also to efficient numerical simulations in the ground state. Various numerical observations have led to a strong belief that the area law is true for every non-critical phase in short-range interacting systems. However, the area law for long-range interacting systems is still elusive, as the long-range interaction results in correlation patterns similar to those in critical phases. Here, we show that for generic non-critical one-dimensional ground states with locally bounded Hamiltonians, the area law robustly holds without any corrections, even under long-range interactions. Our result guarantees an efficient description of ground states by the matrix-product state in experimentally relevant long-range systems, which justifies the density-matrix renormalization algorithm.