High-fidelity control and entanglement of Rydberg atom qubits

TL;DR

This paper demonstrates high-fidelity control and entanglement of Rydberg atom qubits, significantly improving coherence times and gate fidelities, thus advancing the potential for scalable quantum simulation and computation.

Contribution

It introduces a method to reduce laser phase noise, achieving high-fidelity control and entanglement in Rydberg atom qubits, including multi-atom states.

Findings

Two-atom entangled state fidelity exceeds 0.97

Extended entangled state lifetime with dynamical decoupling

Significant improvement in qubit coherence times

Abstract

Individual neutral atoms excited to Rydberg states are a promising platform for quantum simulation and quantum information processing. However, experimental progress to date has been limited by short coherence times and relatively low gate fidelities associated with such Rydberg excitations. We report progress towards high-fidelity quantum control of Rydberg atom qubits. Enabled by a reduction in laser phase noise, our approach yields a significant improvement in coherence properties of individual qubits. We further show that this high-fidelity control extends to the multi-particle case by preparing a two-atom entangled state with a fidelity exceeding 0.97(3), and extending its lifetime with a two-atom dynamical decoupling protocol. These advances open up new prospects for scalable quantum simulation and quantum computation with neutral atoms.