Holly Stemp

Gate-defined quantum dots represent a promising candidate for a scalable qubit platform. A key advantage of quantum dots is their small physical footprint, which could enable the integration of many millions of qubits on a single chip. However, this high qubit density creates challenges in routing the on-chip classical control signals needed to scale these systems to a size capable of solving problems of real-world relevance. To address this, long-range spin
coupling mechanisms are needed to connect spatially sparse arrays of spin qubits. We propose a novel coupling scheme in which a superconducting qubit mediates interactions between
distant quantum dot spin qubits [1]. To implement this approach, we have developed a hybrid semiconductor–superconductor measurement architecture, drawing on established engineering
practices from the superconducting qubit community. In this talk, we will present our co-designed system for hybrid qubit measurements. We will also discuss our progress toward 3D
integration of the two qubit types via flip-chip bonding, a key milestone toward realizing hybrid quantum devices.
References:
[1] H. Kang et. al., Phys. Rev. Applied 23, 044055 (2025)