Description
In this talk, I will present the current status and development logic of the QSOLID project, which aims to build a scalable superconducting quantum computing platform. A central focus is our 10-qubit architecture, which we use as a controlled engineering demonstrator rather than a mere proof of principle. Even at this scale, material limitations, readout-chain imperfections, and amplifier-induced constraints manifest themselves in a non-negotiable way.
I will also discuss our progress on novel coherent materials and fabrication strategies for Traveling-Wave Parametric Amplifiers (TWPAs), and analyze their impact on the overall quantum efficiency of the readout chain.
Particular emphasis will be placed on speeding up measurement and initialization, which remains a key challenge for scalable quantum computing. We experimentally demonstrate a dispersive measurement scheme for superconducting qubits that simultaneously measures the qubit state and actively resets the readout resonator to its initial state, enabling faster measurement cycles without residual photon population.
The underlying message is intentionally conservative: before claiming hundreds of qubits, one should first learn how to control, calibrate, and read out ten of them accurately and reproducibly.
References:
M. Jerger et al., Dispersive Qubit Readout with Intrinsic Resonator Reset, arxiv:2406.04891
