Dynamical quantum repeater using cavity-QED and optical coherent states

TL;DR

This paper proposes a cavity QED-based quantum repeater scheme that uses coherent light and atomic systems, avoiding explicit quantum gate operations, and incorporates entanglement purification and swapping through purely dynamical evolution.

Contribution

It introduces a novel quantum repeater protocol leveraging cavity QED dynamics with coherent light, eliminating the need for quantum logical gates, and integrates entanglement purification and swapping.

Findings

Achieves entanglement distribution using coherent light and cavity QED interactions.

Avoids explicit quantum gate operations by relying solely on cavity QED evolution.

Incorporates entanglement purification and swapping through dynamical protocols.

Abstract

In the framework of cavity QED, we propose a quantum repeater scheme that uses coherent light and atoms coupled to optical cavities. In contrast to conventional schemes, we exploit solely the cavity QED evolution for the entire quantum repeater scheme and, thus, avoid any explicit execution of quantum logical gates. The entanglement distribution between the repeater nodes is realized with the help of pulses of coherent light interacting with the atom-cavity system in each repeater node. In our previous paper [D. Gonta and P. van Loock, Phys. Rev. A 86, 052312 (2012)], we already proposed a dynamical protocol to purify a bipartite entangled state using the evolution of atomic chains coupled to optical cavities. Here, we incorporate parts of this protocol in our repeater scheme, combining it with dynamical versions of entanglement distribution and swapping.