WSN: Towards Highly Scaled Quantum Computing: Signal Density/Delivery Challenges

Presentation Abstract
The development of quantum computing shows no sign of slowing down, with multiple major players in the field recently announcing impressive achievements and aggressive roadmaps towards the deployment of quantum computers able to solve impactful problems for society. Though research and improvement of the core qubit technologies and the quantum processor units (QPUs) themselves have generally dominated the discourse in the quantum computing community, the engineering challenge of actually delivering complete scaled quantum computers with a full-fledged control/interaction framework is gaining increased attention as industrial and academic teams demonstrate qubit counts that push the envelope for I/O. This is especially problematic for technologies which require cryogenic environments, such as the popular superconducting qubit family, as a significant burden is incurred in trying to deliver necessary signals from room temperature through cabling down into the cryogenic environment itself. As proposed qubit counts on roadmaps increases beyond the 5000-physical-qubit mark, it is clear that interconnects will pose a massive challenge for the community. Though cryogenic electronics can help alleviate this, it does not resolve the fundamental problem of intra-fridge wiring towards the QPU proper. This half-day workshop collects academic and industrial speakers with deep expertise in this problem for discussions of the state-of-the-art in signal delivery, both for precision measurements and at scale. Attendees will be able to interact with experts to understand both the current best practices, but also hear about the bottlenecks and opportunities for innovative solutions from the broader microwave community.