Entanglement of neutral-atom chains by spin-exchange Rydberg interaction

TL;DR

This paper investigates strong Rydberg spin-exchange interactions in neutral-atom chains to generate entanglement and implement a SWAP-like quantum gate, enabling scalable quantum information processing.

Contribution

It proposes conditions for strong Rydberg spin-exchange interactions and a protocol for creating scalable entanglement in neutral-atom chains.

Findings

Strong Rydberg spin-exchange interactions can be achieved under specific conditions.

A protocol for entangling a chain of atoms in a time independent of chain length.

Ground-state entanglement can be generated via optical mapping of Rydberg states.

Abstract

Conditions to achieve an unusually strong Rydberg spin-exchange interaction are investigated and proposed as a means to generate pairwise entanglement and realize a SWAP-like quantum gate for neutral atoms. Ground-state entanglement is created by mapping entangled Rydberg states to ground states using optical techniques. A protocol involving SWAP gate and pairwise entanglement operations is predicted to create global entanglement of a chain of $N$ atoms in a time that is independent of $N$.