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Photonics for Quantum (PfQ)

Prospects for Integrated Photonics in Trapped Ion Quantum Computing

Molly R. Krogstad

Published Jul 13, 2021• 0 citations
Publisher

Abstract

Honeywell has commercialized multiple high performance quantum computing systems and continues to accelerate the path to value with rapid system scaling. This talk presents an overview of integrated photonics for scaling beam delivery to trapped ion quantum computing systems, reviewing main benefits, challenges, work to date, and future directions.

DOI
10.1117/12.2603520

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Honeywell has commercialized multiple high performance quantum computing systems and continues to accelerate the path to value with rapid system scaling. This talk presents an overview of integrated photonics for scaling beam delivery to trapped ion quantum computing systems, reviewing main benefits, challenges, work to date, and future directions.
Atomic ions controlled by laser light are among the leading candidates for large scale quantum computing. However operational systems today require vast scaling to reach levels capable of useful computational tasks. The integration of light delivery will be an essential component of this for the trapped-ion approach. I will describe results in which the use of photonics integrated into ion trap chips has allowed us to perform high fidelity two-qubit gates, which are an essential building block for quantum computers. These systems have now been extended to the operation of multiple trap zones, and the creation of novel optical fields for ion trap control while a new generation of chips allowing integration of all required wavelengths as well as optimised light delivery offers further enhancements in performance and scaling.
Trapped atomic ions manipulated by laser beams is a leading candidate to construct scalable and practical quantum computers. Fully programmable quantum computers have been constructed using this technology, offering the highest performance quantum computing in commercial setting. Controlling atomic qubits with lasers is at the heart of constructing reliable trapped ion quantum computers. In this talk, I will discuss the stringent requirement for the optical systems required to build high performance trapped ion quantum computers, and prospect for constructing scalable systems in the future.
Quantinuum has deployed trapped-ion quantum computers based on a quantum charge-coupled (QCCD) architecture exhibiting high-fidelity operations, mid-circuit measurements, and full connectivity with record performance. Quantinuum recently released its accelerated Roadmap outlining plans to reach thousands of physical qubits while further reducing logical qubit error rates in commercial systems by 2029 [1]. Longerterm scaling of the QCCD device architecture will be enabled by replacing bulk free-space optics with integrated photonics for improved light delivery and detection. To this end, Quantinuum is developing integrated photonics technologies at the visible and ultraviolet wavelengths required for future large-scale trapped-ion quantum computers. This poster presents recent developments in materials (waveguiding materials, transparent conductive materials), visible and ultraviolet integrated photonics components for light routing and control, and the various paths to their implementation. These developments are expected to enable scaling towards larger qubit counts while reducing the physical size of the optical control systems.