Low-Crosstalk, Silicon-Fabricated Optical Waveguides for Laser Delivery to Matter Qubits
Abstract
Reliable control of quantum information in matter-based qubits requires precisely applied external fields, and unaccounted for spatial cross-talk of these fields between adjacent qubits leads to loss of fidelity. We report a CMOS foundry-produced, micro-fabricated silicon nitride (Si3N4) optical waveguide for addressing a chain of eight, unequally-spaced trapped barium ions with crosstalk compatible with scalable quantum information processing. The crosstalk mitigation techniques incorporated into the chip design result in a reduction of the measured optical field by at least 50.8(1.3) dB between adjacent waveguide outputs near 650 nm and similar behavior for devices designed for 493 nm and 585 nm. The waveguide outputs near 650 nm, along with a global laser near 493 nm were used to laser-cool a chain of eight barium-138 ions, and a camera imaged the resulting fluorescence at 493 nm.
Cite
@article{arxiv.2406.17607,
title = {Low-Crosstalk, Silicon-Fabricated Optical Waveguides for Laser Delivery to Matter Qubits},
author = {Clayton L. Craft and Nicholas J. Barton and Andrew C. Klug and Kenneth Scalzi and Ian Wildemann and Pramod Asagodu and Joseph D. Broz and Nikola L. Porto and Michael Macalik and Anthony Rizzo and Garrett Percevault and Christopher C. Tison and A. Matthew Smith and Michael L. Fanto and James Schneeloch and Erin Sheridan and Dylan Heberle and Andrew Brownell and Vijay S. S. Sundaram and Venkatesh Deenadayalan and Matthew van Niekerk and Evan Manfreda-Schulz and Gregory A. Howland and Stefan F. Preble and Daniel Coleman and Gerald Leake and Alin Antohe and Tuan Vo and Nicholas M. Fahrenkopf and Todd H. Stievater and Kathy-Anne Brickman-Soderberg and Zachary S. Smith and David Hucul},
journal= {arXiv preprint arXiv:2406.17607},
year = {2026}
}
Comments
9 pages, 7 figures