Protocols for Rydberg entangling gates featuring robustness against quasi-static errors

TL;DR

This paper presents new Rydberg-based entangling gate protocols for neutral atom qubits that are robust against calibration errors, laser fluctuations, and atomic motion-induced Doppler shifts, improving fidelity in quantum computing.

Contribution

Introduction of a family of Rydberg entangling gate protocols that enhance robustness against common experimental errors and motion effects.

Findings

Protocols show increased robustness to Rabi frequency calibration errors.

Protocols maintain high fidelity despite laser intensity fluctuations.

Adaptations reduce sensitivity to atomic-motion-induced Doppler shifts.

Abstract

We introduce a novel family of protocols for entangling gates for neutral atom qubits based on the Rydberg blockade mechanism. These protocols realize controlled-phase gates through a series of global laser pulses that are on resonance with the Rydberg excitation frequency. We analyze these protocols with respect to their robustness against calibration errors of the Rabi frequency or shot-to-shot laser intensity fluctuations, and show that they display robustness in various fidelity measures. In addition, we discuss adaptations of these protocols in order to make them robust to atomic-motion-induced Doppler shifts as well.