Coupling single spins to superconducting circuits represents a powerful route toward scalable hybrid quantum technologies. This Masterclass will present how bismuth impurities in silicon can be used as highly coherent quantum systems and integrated with superconducting devices to build a new generation of hybrid quantum processors.
Bismuth impurities in silicon offer a particularly attractive platform for quantum information processing. Their spin states provide long-lived quantum degrees of freedom, while the silicon environment offers a mature and scalable technological foundation. However, their weak interaction with electromagnetic fields makes individual control and readout challenging. Superconducting circuits, by contrast, provide strong electromagnetic coupling, fast control, and scalable architectures, but generally suffer from shorter coherence times. Hybridizing bismuth spin states in silicon with superconducting devices opens a path toward processors that combine long-lived quantum memory with rapid and flexible superconducting control.
This vision is at the heart of Qolumbus SAS, a recently created French deeptech company developing disruptive hybrid quantum chips and positioning itself among the emerging players of the French quantum ecosystem.
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