MainThe predominant material in modern classical computers, silicon, is also a strong contender for the practical implementation of quantum processors3,6,7,8. To unlock the promised computational benefits of quantum computing, the qubit count needs to scale while maintaining high operation fidelity and connectivity. In terms of qubit numbers, the lead is at present held by superconducting9,10, ion-trap11 and neutral-atom12 processors, which approach hundreds of interconnected qubits. Further sca...