Multipartite controlled-NOT gates using molecules and Rydberg atoms

TL;DR

This paper introduces high-fidelity CNOT gates in a hybrid molecule-Rydberg atom system, leveraging Rydberg pumping to enable scalable quantum computing with robust performance.

Contribution

It presents a novel hybrid approach combining polar molecules and Rydberg atoms for implementing scalable, high-fidelity multi-qubit CNOT gates.

Findings

Gate fidelities exceed 99% in four-qubit implementations.

The method is robust against spontaneous emission effects.

The approach can be extended to larger quantum systems.

Abstract

We propose high-fidelity controlled-NOT (CNOT) gates in a hybrid system of polar molecules and Rydberg atoms based on the unconventional Rydberg pumping mechanism. By combining the rich internal structure of polar molecules with the strong dipole-dipole interactions of Rydberg atoms, we realize both two-to-one and one-to-two gate configurations. Numerical simulations show that the gate performance is robust against spontaneous emission from Rydberg states. The approach naturally extends to larger systems, as demonstrated by four-qubit implementations achieving three-to-one and one-to-three CNOT gates with fidelities exceeding 99\%. These results highlight hybrid molecule-Rydberg atom architectures as a promising platform for scalable quantum information processing.