Entanglement enhancement induced by noise in inhomogeneously monitored systems

TL;DR

This paper demonstrates that in inhomogeneously monitored quantum systems, increasing noise in the ancilla can unexpectedly enhance entanglement within the system, challenging the usual view of noise as purely detrimental.

Contribution

It reveals that specific regimes of noise can boost entanglement in coupled fermionic chains, highlighting the interplay between noise and unitary dynamics as a tool for entanglement control.

Findings

Noise can enhance entanglement in certain regimes.

Entanglement robustness across system sizes and noise parameters.

Dependence of enhancement on ancilla hopping strength.

Abstract

We study how stronger noise can enhance the entanglement in inhomogeneously monitored quantum systems. We consider a free fermions model composed of two coupled chains - a system chain and an ancilla chain, each subject to its own different noise - and explore the dynamics of entanglement within the system chain under different noise intensities. Our results demonstrate that, contrary to the detrimental effects typically associated with noise, certain regimes of noise on the ancilla can significantly enhance entanglement within the system. Numerical simulations demonstrate the robustness of such entanglement enhancement across various system sizes and noise parameters. This enhancement is found to be highly dependent on the hopping strength in the ancilla, suggesting that the interplay between unitary dynamics and noise can be tuned to optimize the entanglement of a quantum system.