Bart Raes

Abstract Silicon spin qubits are a promising platform for quantum computing due to their high coherence, controllability, and CMOS manufacturability, yet scalable implementations have so far been limited to a few qubits. Here, to take a step towards larger qubit systems, we tune and coherently control an eight-dot linear array of silicon spin qubits fabricated in a 300 mm CMOS-compatible foundry process, establishing operational scalability beyond the two-qubit regime.

Abstract Among the many types of qubit presently being investigated for a future quantum computer, silicon spin qubits with millions of qubits on a single chip are uniquely positioned to enable quantum computing. However, it has not been clear whether the outstanding high-fidelity operations and long coherence times shown by silicon spin qubits fabricated in academic settings1,2,3,4,5,6,7,8 can be reliably reproduced when the qubits are manufactured in a semiconductor foundry9,10,11.

1 Introduction Superconducting qubits have garnered significant attention in quantum information technologies due to their scalability and high-gate fidelity.[1] Despite considerable advancements in qubit performance over the past two decades, further improvements in coherence times and fidelity are essential for realizing practical, large-scale quantum computers based on superconducting qubits.[2] Among the various sources of decoherence, fabrication processes play a critical role, as they...