Fast and scalable quantum information processing with two-electron atoms in optical tweezer arrays

TL;DR

This paper proposes a scalable quantum computing platform using neutral alkaline-earth-like atoms in optical tweezer arrays, enabling high-fidelity operations and entanglement distribution for quantum information processing.

Contribution

It introduces a comprehensive experimental architecture leveraging electronic clock states for efficient all-optical qubit operations in neutral atom arrays.

Findings

High-fidelity register initialization demonstrated

Rapid spin-exchange gates achieved

Expected fidelity for multiple SWAP gates computed

Abstract

Atomic systems, ranging from trapped ions to ultracold and Rydberg atoms, offer unprecedented control over both internal and external degrees of freedom at the single-particle level. They are considered among the foremost candidates for realizing quantum simulation and computation platforms that can outperform classical computers at specific tasks. In this work, we describe a realistic experimental toolbox for quantum information processing with neutral alkaline-earth-like atoms in optical tweezer arrays. In particular, we propose a comprehensive and scalable architecture based on a programmable array of alkaline-earth-like atoms, exploiting their electronic clock states as a precise and robust auxiliary degree of freedom, and thus allowing for efficient all-optical one- and two-qubit operations between nuclear spin qubits. The proposed platform promises excellent performance thanks to high-fidelity register initialization, rapid spin-exchange gates and error detection in readout. As a benchmark and application example, we compute the expected fidelity of an increasing number of subsequent SWAP gates for optimal parameters, which can be used to distribute entanglement between remote atoms within the array.