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Fabian, Joshua Marius

University of British Columbia

Quantum computing promises to fundamentally change our current computational capabilities, offering exponential speedup in many key areas. While many different quantum computing architectures exist, a clear way to achieve scalable, fault-tolerant quantum computing remains elusive. Photonic quantum computing with spin qubits is a promising novel quantum computing architecture. It aims to solve many of the present-day issues; however, not all necessary photonic components are available as of now. In particular, a photonic cavity for the spin qubit-photon interface is missing. In this work, we give the key characteristics and requirements for such a photonic cavity and experimentally demonstrate a cavity system with potential to meet them. To this end, we design, simulate, and experimentally characterise a photonic crystal slot-bridge nanobeam cavity fulfilling the first key characteristic: an optimised quality factor to mode volume ratio. We investigate the sensitivity of the cavity for different design parameters and achieve good agreement with simulations. This cavity demonstration also serves as a guideline for future design optimisation aiming to achieve better performance values. We further demonstrate a permanent post-fabrication trimming method based on laser-assisted local surface oxidation on the slot-bridge nanobeam cavities. This fulfills the second key characteristic, namely that of trimming capability of the cavity resonance. Finally, we give an outlook on possible future work to improve the trimming method and cavity optimisation.

Text

2023-08-24

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/85621

Electrical and Computer Engineering

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/4.0/