# Deterministic facilitated excitation of the weakly-driven atom in heteronuclear Rydberg atom pairs beyond antiblockade

## TL;DR

This paper demonstrates a novel excitation facilitation mechanism in heteronuclear Rydberg atom pairs that enhances deterministic excitation probabilities beyond traditional antiblockade methods, by leveraging strong blockaded energy shifts.

## Contribution

It introduces a new excitation facilitation approach that does not depend on antiblockade, utilizing strong interactions to improve excitation efficiency in weakly-driven heteronuclear Rydberg atoms.

## Key findings

- Enhanced excitation probability at off-resonant regimes.
- Effective detuning reduction via auxiliary strong driving.
- Robustness against blockade condition breaking.

## Abstract

Due to the intrinsic strong blockaded interaction shifting the energy level of Rydberg state, the steady Rydberg probability may be substantially restrained to a low level, especially for atoms suffering from weak drivings. We report an exotic excitation facilitation using strong blockaded energy shifting the double excitation state, leading to the weakly-driven atom deterministically excited by a significantly improved fraction even at far off-resonant regimes. This phenomenon is attributed to the effective induction of a reduced detuning to the weakly-driven atom by optimizing parameters of an auxiliary strongly-driven atom, arising a modified large probability preserved for a broadening range of detunings. The influence from breaking blockade condition on the excitation probability is also discussed. In contrast to previous approaches, our excitation facilitation mechanism does not rely on antiblockade effect to the compensation of Rydberg energy, serving as a fresh way to a deterministic single-atom excitation of the target atom in a pair of heteronuclear Rydberg atoms, where a strong interatomic interaction is required.