A modular quantum processor made using phosphorus atoms in silicon

A high-performance silicon-based quantum processor has been developed in which the spins of nine phosphorus nuclei — divided into two groups, or registers — and two shared electrons act as quantum bits (qubits). The modular design of this 11-qubit processor opens the door to a scalable approach to building large, reliable quantum-computing processors. An 11-qubit processor, comprising a 4-nucleus and a 5-nucleus register, coupled by 2 electrons, is a milestone in quantum computing.