Resilient quantum gates on periodically driven Rydberg atoms

TL;DR

This paper proposes a robust controlled-Z gate implementation on Rydberg atoms using amplitude modulation and Landau-Zener-Stückelberg transitions, enhancing fault tolerance against interaction fluctuations and operational imperfections.

Contribution

It introduces a novel gate scheme employing amplitude modulation and Landau-Zener transitions to improve resilience and scalability of quantum gates on Rydberg atoms.

Findings

Achieves low fidelity errors with feasible parameters

Enhances gate robustness against interaction fluctuations

Scales to multiqubit phase gates in one step

Abstract

Fault-tolerant implementation of quantum gates is one of preconditions for realizing quantum computation. The platform of Rydberg atoms is one of the most promising candidates for achieving quantum computation. We propose to implement a controlled-$Z$ gate on Rydberg atoms where an amplitude-modulated field is employed to induce Rydberg antiblockade. Gate robustness against the fluctuations in the Rydberg-Rydberg interaction can be largely enhanced by adjusting amplitude-modulated field. Furthermore, we introduce a Landau-Zener-St\"{u}ckelberg transition on the target atom so as to improve the gate resilience to the deviation in the gate time and the drift in the pulse amplitude. With feasible experimental parameters, one can achieve the gate with low fidelity errors caused by atomic decay, interatomic dipole-dipole force, and Doppler effects. Finally, we generalize the gate scheme into multiqubit cases, where resilient multiqubit phase gates can be obtained in one step with an unchanged gate time as the number of qubits increases.