Uniting Quantum Processing Nodes of Cavity-coupled Ions with Rare-earth Quantum Repeaters Using Single-photon Pulse Shaping Based on Atomic Frequency Comb

TL;DR

This paper proposes a novel protocol to connect cavity-coupled ions with rare-earth quantum repeaters by custom-shaping single-photon pulses using atomic frequency combs, enabling integration of different quantum platforms.

Contribution

It introduces an efficient method for temporal reshaping of single-photon pulses tailored for inhomogeneously broadened systems, facilitating hybrid quantum network integration.

Findings

Achieved efficient photon pulse reshaping preserving purity.

Modified atomic frequency comb protocol for inhomogeneous broadening.

Provided a viable solution for connecting quantum processing nodes with repeaters.

Abstract

We present an architecture for remotely connecting cavity-coupled trapped ions via a quantum repeater based on rare-earth-doped crystals. The main challenge for its realization lies in interfacing these two physical platforms, which produce photons with a typical temporal mismatch of one or two orders of magnitude. To address this, we propose an efficient protocol that enables custom temporal reshaping of single-photon pulses whilst preserving purity. Our approach is to modify a commonly used memory protocol, called atomic frequency comb, for systems exhibiting inhomogeneous broadening like rare-earth-doped crystals. Our results offer a viable solution for uniting quantum processing nodes with a quantum repeater backbone.