Overcoming Cryogenic Cabling Challenges within Dilution Refrigerators for Effectively Scaling Quantum Computing

A major challenge in scaling quantum computing systems is the severe limitation imposed by conventional cryogenic cabling within dilution refrigerators (DRs). As qubit counts increase, the volume of coaxial cables required quickly overwhelms the available space, creates excessive heat load that exceeds the DR's cooling capacity, and presents significant installation difficulties. These physical and thermal bottlenecks are a primary barrier to achieving higher qubit numbers within standard laboratory footprints and budgets.

This presentation will demonstrate how the innovative Cri/oFlex® technology from Delft Circuits (DC) can address the challenges faced in a FormFactor LF600 lab-scale dilution refrigerator. Including:

Replacing coaxial cables with flexible, high-density stripline I/O systems featuring integrated filtering and specialized connectors for in a significantly smaller wiring volume and drastically reduced heat load per channel compared to conventional methods.

Showing how this technology increases channel counts from 50 to 500 and enables up to 100 qubits within a lab-scale DR, without compromising performance.

Comparing performance and density to conventional cabling within the context of DR cooling power

Outlining the design, manufacturing, assembly, and installation process.

The presentation will conclude by highlighting the capability of DC cables to significantly increase channel density and qubit count within existing lab infrastructure. This approach offers options for even larger systems using bigger dilution refrigerators (DRs). It provides a scalable, robust, and user-friendly I/O system, offering a space- and budget-efficient path towards future, higher-qubit quantum processors.