Low-crosstalk silicon-fabricated optical waveguides for laser delivery to matter qubits
Year: 2025
Type: article
Abstract: Reliable control of quantum information in matter-based qubits requires precisely applied external fields, and unaccounted-for spatial crosstalk of these fields between adjacent qubits leads to loss of fidelity. We report a CMOS foundry-produced microfabricated silicon nitride ( Si 3 N 4 ) 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, have been used to laser cool a chain of eight 138 Ba + ions, and a camera has imaged the resulting fluorescence at 493 nm.
Source: Physical Review Applied
DOI: 10.1103/jgks-dss2
Authors: Clayton L. Craft, Nicholas J. Barton, Andrew C. Klug, Kenneth Scalzi, Ian Wildemann, Pramod Asagodu, Joseph D. Broz, Nikola L. Porto, Michael Macalik, Anthony Rizzo, Garrett Percevault, Christopher C. Tison, A. Matthew Smith, Michael L. Fanto, James Schneeloch, Erin Sheridan, Dylan Heberle, Andrew Brownell, Vijay S.S. Sundaram, Venkatesh Deenadayalan, Matthew van Niekerk, Evan Manfreda-Schulz, Gregory A. Howland, Stefan F. Preble, Daniel Coleman, Gerald Leake, Alin Antohe, Tuan Vo, Nicholas M. Fahrenkopf, Todd H. Stievater, Kathy-Anne Brickman-Soderberg, Zachary S. Smith, David Hucul
Language: English
Topic: Photonic and Optical Devices
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4417267791