Seeing is believing—precision atom qubits achieve major milestone—7 March 2018

The unique Australian approach of creating quantum bits from precisely positioned individual atoms in silicon is reaping major rewards, with Australian Research Council (ARC) supported scientists showing for the first time that they can make two of these atom qubits 'talk to each other.

The team—led by The University of New South Wales Scientia Professor Michelle Simmons—an ARC Australian Laureate Fellow and Director of the ARC Centre of Excellence for Quantum Computation and Communication Technology—is the only group in the world that has the ability to see the exact position of their qubits in the solid state.

Professor Simmons’ team create 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 CommunicationsIt follows two other recent breakthroughs using this unique approach to building a quantum computer.

By optimising their nano-manufacturing process, Professor Simmons’ team has also recently created quantum circuitry with the lowest recorded electrical noise of any semiconductor device.

And they have created an electron spin qubit with the longest lifetime ever reported in a nano-electric device—30 seconds.

“The combined results from these three research papers confirm the extremely promising prospects for building multi-qubit systems using our atom qubits,” says Professor Simmons, who speaks about the importance of the results in a clip that can be viewed on Youtube.

Media released by The University of New South Wales.


Image: the ARC Centre of Excellence research team is the first that has ever been able to see the exact position of their qubits in the solid state.
Credit: The University of New South Wales.



Original Published Date: 
Wednesday, March 7, 2018