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Conference on Lasers and Electro-Optics

CMOS Photonic Circuits for Trapped Ion Quantum Computing and Molecular Sensing

Rajeev J. Ram

Published Jan 1, 2018• 0 citations
Publisher

Abstract

Photonic integrated circuits for UV and visible light offer a scalable approach to the classical optics and electronics required for large-scale atomic quantum information processing as well as for self-contained lab-on-a-chip systems for molecular diagnostics.
DOI
10.1364/cleo_si.2018.stu3a.5

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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.
We demonstrate an integrated photonic platform for control of complex atomic systems. The platform includes multiple waveguide layers and a suite of passive photonic circuit components supporting a wavelength range from 370-1100 nm. In particular, we demonstrate a novel dual-layer vertical grating coupler used for efficiently directing visible light to precise positions above the chip surface. These circuits are compatible with traditional CMOS fabrication techniques and are well suited for improving the scalability of quantum information processing systems based on trapped-ion technology. A chip-scale waveguide platform at visible wavelengths could also prove useful in a variety of bio-photonic and sensing applications requiring precise light delivery or readout in a compact footprint.