Floating Electrons and Superconducting Circuits: Building Blocks for Fault-Tolerant Quantum Computing
Superconducting circuits and semiconductor quantum dots are leading platforms for solid-state quantum computing, offering complementary strengths. Combining them to build a fault-tolerant quantum computer at scale is a tantalising prospect, but far from straightforward.
In the first part of this talk, I will present work on an electron paramagnetic resonance (EPR)-based microwave quantum memory, in which a magnetic-field-resilient, parametrically tunable superconducting circuit enables deterministic addressing of the clock transitions and dynamic nuclear polarisation. In the second part, I will discuss progress in characterising and controlling floating electrons on condensed noble gases, and the recent extension of this platform to solid hydrogen. This emerging platform is best described as a “quantum dot in vacuum.” By evading detrimental lattice interactions, it attains remarkably strong charge-dipole coupling and long coherence times, prompting us to rethink the conventions of semiconductor-based approaches. I will conclude with a vision for integrating these elements into a quantum computing architecture that achieves both high connectivity and scalability.
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