Quantum Circuits Reproduce Experimental Two-dimensional Many-body Localization Transition Point

TL;DR

This paper uses fermionic quantum circuits to accurately reproduce the experimentally observed transition point of two-dimensional many-body localization, providing a new variational approach that aligns well with experimental data and explores the phase diagram.

Contribution

It introduces a novel fermionic quantum circuit method to model 2D MBL systems, successfully matching experimental transition points and mapping the phase diagram.

Findings

Phase transition point matches experimental measurements

Filling fraction-dependent MBL phase diagram obtained

Computed mean localization lengths for future comparison

Abstract

While many studies point towards the existence of many-body localization (MBL) in one dimension, the fate of higher-dimensional strongly disordered systems is a topic of current debate. The latest experiments as well as several recent numerical studies indicate that such systems behave many-body localized -- at least on practically relevant time scales. However, thus far, theoretical approaches have been unable to quantitatively reproduce experimentally measured MBL features -- an important requirement to demonstrate their validity. In this work, we use fermionic quantum circuits as a variational method to approximate the full set of eigenstates of two-dimensional MBL systems realized in fermionic optical lattice experiments. Using entanglement-based features, we obtain a phase transition point in excellent agreement with the experimentally measured value. Moreover, we calculate, the filling fraction-dependent MBL phase diagram, an important feature which has not been addressed in previous literature. We argue that our approach best captures the underlying charge-density-wave experiments and compute the mean localization lengths, which can be compared to future experiments.