# Subradiant Bell states in distant atomic arrays

## TL;DR

This paper demonstrates that two distant atomic arrays can support long-lived, subradiant Bell states that enable high-fidelity quantum information transfer and entanglement, with potential experimental realizations using cold atoms.

## Contribution

It introduces a method to create and utilize subradiant Bell states in distant atomic arrays for quantum information processing, highlighting their long lifetime and non-local entanglement capabilities.

## Key findings

- Supports long-lived Bell superposition states with strong subradiance
- Enables high-fidelity quantum state transfer between arrays
- Analyzes robustness against experimental imperfections

## Abstract

We study collective `free-space' radiation properties of two distant single-layer arrays of quantum emitters as two-level atoms. We show that this system can support a long-lived Bell superposition state of atomic excitations exhibiting strong subradiance, which corresponds to a non-local excitation of the two arrays. We describe the preparation of these states and their application in quantum information as resource of non-local entanglement, including deterministic quantum state transfer with high fidelity between the arrays representing quantum memories. We discuss experimental realizations using cold atoms in optical trap arrays with subwavelength spacing, and analyze the role of imperfections.