Centre updates

Tuning into quantum: scientists unlock signal frequency control of precision atom qubits

CQC2T scientists, led by Prof Michelle Simmons, have achieved a new milestone in their approach to creating a quantum computer chip in silicon, demonstrating the ability to tune the control frequency of a qubit by engineering its atomic configuration.

The team from UNSW Sydney successfully implemented an atomic engineering strategy for individually addressing closely spaced spin qubits in silicon. The scientists created engineered phosphorus molecules with different separations between the atoms within the molecule allowing for families of qubits with different control frequencies. Each molecule could then be operated individually by selecting the frequency that controlled its electron spin.

“The ability to engineer the number of atoms within the qubits provides a way of selectively addressing one qubit from another, resulting in lower error rates even though they are so closely spaced,” says Professor Simmons. “These results highlight the ongoing advantages of atomic qubits in silicon.”

Tuning in and individually controlling qubits within a 2 qubit system is a precursor to demonstrating the entangled states that are necessary for a quantum computer to function and carry out complex calculations.

“We can tune into this or that molecule – a bit like tuning in to different radio stations,” says Sam Hile, lead co-author of the paper and Research Fellow at UNSW. “It creates a built-in address which will provide significant benefits for building a silicon quantum computer.”

Read paper here
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Australia's first quantum computing company launched

Australia's first quantum computing company, Silicon Quantum Computing Pty Ltd, has been formed to accelerate the commercialisation of silicon quantum computing technology initially developed by CQC2T.

SQC board members with the federal Industry Minister and NSW Chief Scientist. L to R: CBA Head of Emerging Technology Dilan Rajasingham, Telstra Chief Scientist Professor Hugh Bradlow, Secretary of the Department of Industry, Innovation and Science Glenys Beauchamp, Minister for for Industry, Innovation and Science the Hon Arthur Sinodinos AO, Professor Michelle Simmons, SQC Chair Stephen Menzies, NSW Chief Scientist and Engineer Professor Mary O'Kane, UNSW Vice-Chancellor Professor Ian Jacobs

The company is a first-of-its-kind collaboration between UNSW, the Commonwealth and NSW governments, Commonwealth Bank Australia and Telstra. CQC2T Director Prof Michelle Simmons is a founding member of the company board.

Read more at the UNSW Newsroom

Watch a video showing highlights from the launch

CQC2T researchers propose new type of qubit

Prof Andrea Morello and his team at UNSW has developed a new architecture for quantum computing, based on novel ‘flip-flop qubits’, that promises to make the large-scale manufacture of quantum chips dramatically easier.

Artist's impression of the 'flip-flop' qubits exhibiting quantum entanglement. Tony Melov/UNSW

“What the team have invented is a new way to define a ‘spin qubit’ that uses both the electron and the nucleus of the atom. Crucially, this new qubit can be controlled using electric signals, instead of magnetic ones," said Prof Morello.

Read more at the UNSW Newsroom

Access the full paper at Nature Communications.