Exploiting Quench Dynamics in Spin Chains for Distant Entanglement and Quantum Communication

TL;DR

This paper presents a minimal-control method to generate long-distance entanglement in spin chains by exploiting quench dynamics, without the need for precise control or engineered couplings, applicable across various experimental platforms.

Contribution

It introduces a novel entanglement scheme using a simple quench protocol in spin chains with Neel order, avoiding complex control or engineered interactions.

Findings

Achieves significant end-to-end entanglement through quench dynamics.

Robust to randomness and finite quench effects.

Potential for implementation in diverse experimental systems.

Abstract

We suggest a method of entangling significantly the distant ends of a spin chain using minimal control. This entanglement between distant individual spins is brought about solely by exploiting the dynamics of an initial mixed state with Neel order if the lattice features nearest-neighbor XXZ interaction. There is no need to control single spins or to have engineered couplings or to pulse globally. The method only requires an initial nonadiabatic switch (a quench) between two Hamiltonians followed by an evolution under the second Hamiltonian. The scheme is robust to randomness of the couplings as well as the finiteness of an appropriate quench and could potentially be implemented in various experimental setups, ranging from atoms in optical lattices to Josephson-junction arrays.