Entanglement accumulation, retrieval, and concentration in cavity QED

TL;DR

This paper explores how entanglement can be accumulated, retrieved, and concentrated in cavity QED systems using atom-field interactions, enabling efficient quantum information transfer and teleportation with entanglement enhancement.

Contribution

It introduces a method for ideal entanglement transfer and retrieval in cavity QED, including entanglement concentration and a teleportation protocol utilizing these processes.

Findings

Entanglement transfer and retrieval can be ideal with resonant interactions.

Non-maximally entangled atomic pairs can be concentrated during retrieval.

A teleportation protocol with built-in entanglement concentration is demonstrated.

Abstract

The ability to accumulate and retrieve entanglement in the fields of two remote cavities with pairs of two-level atoms is discussed. It is shown that this transfer and retrieval can be indeed ideal with a resonant interaction. The case of initial non-maximally entangled atomic pairs is also considered. This leads to the possibility of concentrating entanglement into a single pair at the retrieval stage. A teleportation protocol based on the same setup is presented. This makes possible teleportation with built-in entanglement concentration.