# Adiabatic and high-fidelity quantum gates with hybrid Rydberg-Rydberg interactions

## TL;DR

This paper presents a novel adiabatic protocol for high-fidelity, fast two-atom quantum gates using hybrid Rydberg interactions, overcoming blockade errors and enabling scalable quantum computation.

## Contribution

It introduces a dark-state adiabatic passage method that combines van der Waals and resonant dipole-dipole interactions for error-free Rydberg gates.

## Key findings

- Achieves gate fidelity of approximately 99.96%.
- Operates within about 80 nanoseconds.
- Provides a flexible framework for hybrid Rydberg quantum gates.

## Abstract

Rydberg blockaded gate is a fundamental ingredient for scalable quantum computation with neutral Rydberg atoms. However the fidelity of such a gate is intrinsically limited by a blockade error coming from a Rydberg level shift that forbids its extensive use. Based on a dark-state adiabatic passage, we develop a novel protocol for realizing a two-atom blockade-error-free quantum gate in a hybrid system with simultaneous van der Waals (vdWsI) and resonant dipole-dipole interactions (DDI). The basic idea relies on converting the roles of two interactions, which is, the DDI serves as one time-dependent tunable pulse and the vdWsI acts as a negligible middle level shift as long as the adiabatic condition is preserved. We adopt an optimized super-Gaussian optical pulse with $k\pi$ ($k\gg 1$) area accompanied by a smooth tuning for the DDI, composing a circular stimulated Raman adiabatic passage, which can robustly ensure a faster operation time $\sim 80ns$ as well as a highly-efficient gate fidelity $\sim0.9996$. This theoretical protocol offers a flexible treatment for hybrid interactions in complex Rydberg systems, enabling on-demand design of new types of effective Rydberg quantum gate devices.