Efficient generation of multiqubit entanglement states using rapid adiabatic passage

TL;DR

This paper introduces a rapid adiabatic passage method for efficiently creating high-fidelity multiqubit entangled states in Rydberg atom arrays, demonstrating robustness and scalability for quantum information applications.

Contribution

The paper presents a novel RAP-based scheme for generating entanglement in Rydberg atoms, achieving high fidelity and robustness, and extending to larger atomic arrays.

Findings

Fidelities exceeding 0.9995 for two-qubit Bell and three-qubit W states.

Successful generation of four-qubit GHZ states via spatial correlations.

Robustness of the scheme against experimental imperfections.

Abstract

We propose the implementation of a rapid adiabatic passage (RAP) scheme to generate entanglement in Rydberg atom-array systems. This method transforms a product state in a multi-qubit system into an entangled state with high fidelity and robustness. By employing global and continuous driving laser fields, we demonstrate the generation of two-qubit Bell state and three-qubit W state, via sequential RAP pulses within the Rydberg blockade regime. As an illustrative example, applying this technique to alkali atoms, we predict fidelities exceeding 0.9995 for two-qubit Bell and three-qubit W state, along with excellent robustness. Furthermore, our scheme can be extended to generate entanglement between weakly coupled atoms and to create four-qubit Greenberger- Horne-Zeilinger states through spatial correlations. Our approach holds the potential for extension to larger atomic arrays, offering a straightforward and efficient method to generate high-fidelity entangled states in neutral atom systems.