Increasing entanglement through engineered disorder in the random Ising chain

TL;DR

This paper demonstrates that engineered correlations in disordered quantum spin chains can significantly enhance ground state entanglement, surpassing levels found in ordered systems, with implications for quantum information processing.

Contribution

It reveals that correlations between disorder parameters increase entanglement in disordered quantum chains, a novel insight into disorder-engineered quantum states.

Findings

Entanglement entropy increases with correlated disorder.

Correlated disorder leads to larger entanglement than uncorrelated disorder.

Results apply to both Ising and Potts models.

Abstract

The ground state entanglement entropy between block of sites in the random Ising chain is studied by means of the Von Neumann entropy. We show that in presence of strong correlations between the disordered couplings and local magnetic fields the entanglement increases and becomes larger than in the ordered case. The different behavior with respect to the uncorrelated disordered model is due to the drastic change of the ground state properties. The same result holds also for the random 3-state quantum Potts model.