Dynamical entanglement purification using chains of atoms and optical cavities

TL;DR

This paper proposes a practical, deterministic scheme for dynamical entanglement purification using chains of atoms and optical cavities, avoiding complex gate operations, to advance quantum repeaters for long-distance communication.

Contribution

It introduces a novel cavity QED-based method for entanglement purification that eliminates the need for CNOT gates, simplifying the process and improving efficiency.

Findings

Deterministic entanglement purification without CNOT gates.

Compatible with entanglement distribution and swapping.

Facilitates efficient quantum repeaters for long-distance communication.

Abstract

In the framework of cavity QED, we propose a practical scheme to purify dynamically a bipartite entangled state using short chains of atoms coupled to high-finesse optical cavities. In contrast to conventional entanglement purification protocols, we avoid CNOT gates, thus reducing complicated pulse sequences and superfluous qubit operations. Our interaction scheme works in a deterministic way, and together with entanglement distribution and swapping, opens a route towards efficient quantum repeaters for long-distance quantum communication.