Deterministic spin-photon entanglement from a trapped ion in a fiber Fabry-Perot cavity

TL;DR

This paper demonstrates a high-fidelity, deterministic entanglement between a trapped ion and a photon within a fiber-based cavity, advancing quantum network node development for secure communication and distributed computing.

Contribution

It reports the first realization of a quantum network node with a trapped ion in a fiber cavity achieving 91.2% entanglement fidelity and a 62 Hz entanglement rate.

Findings

Achieved 91.2% entanglement fidelity.

Generated entanglement at 62 Hz rate.

Demonstrated a practical quantum network node.

Abstract

The development of efficient network nodes is a key element for the realisation of quantum networks which promise great capabilities as distributed quantum computing or provable secure communication. We report the realisation of a quantum network node using a trapped ion inside a fiber-based Fabry-Perot cavity. We show the generation of deterministic entanglement at a high fidelity of $ 91.2(2) $\,\% between a trapped Yb--ion and a photon emitted into the resonator mode. We achieve a success probability for generation and detection of entanglement for a single shot of $ 2.5 \cdot 10^{-3}$ resulting in 62\,Hz entanglement rate.