https://www.sciencedaily.com/releases/2018/07/180713220240.htm

A team of researchers from the Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) at UNSW Sydney have successfully implemented an atomic engineering strategy for individually addressing closely spaced spin qubits in silicon.

The researchers built two qubits - one an engineered molecule consisting of two phosphorus atoms with a single electron, and the other a single phosphorus atom with a single electron - and placed them just 16 nanometres apart in a silicon chip.