A scanning tunnelling microscope image showing the electron wave function of a qubit made from a phosphorus atom precisely positioned in silicon. Credit: UNSW
March 7, 2018 (Phys.org) -- The unique Australian approach of creating quantum bits from precisely positioned individual atoms in silicon is reaping major rewards, with UNSW Sydney-led scientists showing for the first time that they can make two of these atom qubits "talk" to each other.
The team -- led by UNSW Professor Michelle Simmons, Director of the Centre of Excellence for Quantum Computation and Communication Technology, or CQC2T -- is the only group in the world that has the ability to see the exact position of their qubits in the solid state.
Simmons' team creates the atom qubits by precisely positioning and encapsulating individual phosphorus atoms within a silicon chip. Information is stored on the quantum spin of a single phosphorus electron.
The team's latest advance -- the first observation of controllable interactions between two of these qubits -- is published in the journal Nature Communications. It follows two other recent breakthroughs using this unique approach to building a quantum computer.