Entanglement Amplification in the Non-Perturbative Dynamics of Modular Quantum Systems

TL;DR

This paper demonstrates that in non-perturbative dynamics of modular quantum systems, entanglement between distant objects can be significantly amplified and efficiently distributed, with robustness against thermal fluctuations and simple control requirements.

Contribution

It reveals the mechanism of entanglement amplification via interference of ground and low-lying states in non-perturbative regimes, enabling fast, robust entanglement distribution.

Findings

Initial end-to-end entanglement is strongly amplified.

Entanglement can be efficiently distributed between distant objects.

The scheme is robust against thermal fluctuations and easy to control.

Abstract

We analyze the conditions for entanglement amplification between distant and not directly interacting quantum objects by their common coupling to media with static modular structure and subject to a local (single-bond) quenched dynamics. We show that in the non-perturbative regime of the dynamics the initial end-to-end entanglement is strongly amplified and, moreover, can be distributed efficiently between distant objects. Due to its intrinsic local and non-perturbative nature the dynamics is fast and robust against thermal fluctuations, and its control is undemanding. We show that the origin of entanglement amplification lies in the interference of the ground state and at most one of the low-lying energy eigenstates. The scheme can be generalized to provide a fast and efficient router for generating entanglement between simultaneous multiple users.