A fiber array architecture for atom quantum computing

TL;DR

This paper introduces a fiber array architecture for atom quantum computing that enables fully independent control of multiple atoms, demonstrating high-fidelity single-qubit gates and paving the way for scalable quantum algorithms.

Contribution

The paper presents a novel fiber array design that allows for independent control of atoms in optical tweezers, achieving high-fidelity gates and scalable control.

Findings

Successfully trapped and controlled ten atoms in 2D optical tweezers.

Achieved average single-qubit gate fidelity of 0.9966.

Performed simultaneous gates on four qubits with fidelity 0.9961.

Abstract

Arrays of single atoms trapped in optical tweezers are increasingly recognized as a promising platform for scalable quantum computing. In both the fault-tolerant and NISQ eras, the ability to individually control qubits is essential for the efficient execution of quantum circuits. Time-division multiplexed control schemes based on atom shuttling or beam scanning have been employed to build programmable neutral atom quantum processors, but achieving high-rate, highly parallel gate operations remains a challenge. Here, we propose a fiber array architecture for atom quantum computing capable of fully independent control of individual atoms. The trapping and addressing lasers for each individual atom are emitted from the same optical waveguide, enabling robust control through common-mode suppression of beam pointing noise. Using a fiber array, we experimentally demonstrate the trapping and independent control of ten single atoms in two-dimensional optical tweezers, achieving individually addressed single-qubit gate with an average fidelity of 0.9966(3). Moreover, we perform simultaneous arbitrary single-qubit gate on four randomly selected qubits, resulting in an average fidelity of 0.9961(4). Our work paves the way for time-efficient execution of quantum algorithms on neutral atom quantum computers.