Enhancing ground-state interaction strength of neutral atoms via Floquet stroboscopic dynamics

TL;DR

This paper introduces a Floquet modulation technique to significantly enhance ground-state interactions in neutral atom systems, enabling improved quantum state preparation and single-photon sources.

Contribution

The paper proposes a novel Floquet-based method to amplify ground-state interactions in Rydberg atomic ensembles, even outside the Rydberg blockade regime.

Findings

Neutral atoms can form a $W$ state via Floquet dynamics.

High fidelity is maintained even with weak Rydberg interactions.

The scheme improves quantum state preparation and single-photon generation.

Abstract

Neutral atom systems are promising platforms for quantum simulation and computation, owing to their long coherence times. However, their intrinsically weak ground-state interactions pose a major limitation to the advancement of scalable quantum simulation and computation. To address this challenge, we propose an approach to enhancing the ground-state interaction strength of neutral atoms via Floquet modulation of a Rydberg atomic ensemble. Each Floquet period consists of ground-state coupling followed by a pulse driving the transition from the ground state to the Rydberg state. Theoretical analysis and numerical simulations demonstrate that after a defined evolution time, neutral atoms within Rydberg ensembles can collectively form a $W$ state in the ground-state manifold. Even when the Rydberg interaction strength is far below the blockade regime, the fidelity remains remarkably high. Finally, we analyze the application of this scheme in the preparation of single-photon sources. In general, our proposed mechanism offers an efficient and highly controllable method for quantum state preparation within the Rydberg atomic ensembles, significantly enhancing the accuracy and stability of quantum state engineering while providing a well-controlled quantum environment for single-photon generation.