Deterministic entanglement of two neutral atoms via Rydberg blockade

TL;DR

This paper reports the first deterministic entanglement of two neutral atoms using Rydberg blockade, achieving fidelity above the entanglement threshold, and provides detailed error analysis.

Contribution

It demonstrates a controlled-NOT gate for neutral atoms via Rydberg blockade with high fidelity, advancing quantum information processing capabilities.

Findings

Entanglement fidelity of 0.58 without correction

Fidelity of 0.71 after background correction

Good agreement with error model

Abstract

We demonstrate the first deterministic entanglement of two individually addressed neutral atoms using a Rydberg blockade mediated controlled-NOT gate. Parity oscillation measurements reveal an entanglement fidelity of $F=0.58\pm0.04$, which is above the entanglement threshold of $F=0.5$, without any correction for atom loss, and $F=0.71\pm0.05$ after correcting for background collisional losses. The fidelity results are shown to be in good agreement with a detailed error model.