Centre Updates

Feynman inspires new CQC2T Nature Communications paper

UNSW physics researcher Sam Gorman

Director of CQC2T, Scientia Professor Michelle Simmons said her team’s approach to building a quantum computer “from the ground up, atom by atom” is inspired by physicist Richard Feynman who said: ‘what I cannot create, I do not understand’. Centre researchers create their 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. Simmons’ team use a scanning probe to directly measure the atom’s wave function to show the exact physical location in the chip. “We are the only group in the world who can actually see where our qubits are,” said Prof Simmons.

In the new paper, the team show they can control the interactions between two of these atom qubits so the quantum spins of their electrons become correlated. Building on two other recent results, these three papers collectively confirm the extremely promising prospects for building multi-qubit systems using Centre atom qubits.

Read paper here
Read article here
Watch video

CQC2T demonstrates Bell inequality with Light Wave

Centre research associate Oliver Thearle in the ANU Quantum Optics lab

A new CQC2T paper in Physical Review Letters has demonstrated the first observation of Bell correlations in a continuous variable system, thereby showing the strength of photon number correlations when inferred through homodyne measurements.

Lead author from ANU Oliver Thearle said the paper’s significance is in the fact that “it is the first demonstration of a Violation of Bell’s inequality using light fields as opposed to photon counting as was originally proposed by Bell. This is possible through the wave particle duality of light”.

Violation of Bell inequality is a fundamental test to rule out local hidden variable model descriptions of correlations between two physically separated systems. There have been a number of experiments in which a Bell inequality has been violated using discrete-variable systems in recent years. The ANU-led Centre team demonstrated a violation of Bell’s inequality using continuous variable quadrature measurements. This means that the wave nature of light also leads to the same conclusion that local hidden variable is an insufficient description of reality.

By creating a four-mode entangled state with homodyne detection, they recorded a clear violation with a Bell value of B = 2.31±0.02, where B ≤ 2 validates local hidden variables. This opens new possibilities for using continuous variable systems for a number of quantum communication applications, such as a source independent quantum random number generator.

Centre Chief Investigator Prof Ping Koy Lam from the ANU said, “Our experiment using bright laser beams complements very well with the recent successful loophole free Bell test demonstrations in the discrete variable regime.”

Four CQC2T Chief Investigators from the ANU and the University of Queensland collaborated on this paper.

Full paper is here

Westpac Future Leaders Scholarship awarded to CQC2T post-graduate student

CQC2T is proud to announce that one of our new 2018 PhD students has been awarded a Westpac Future Leaders Scholarship to undertake post-graduate study.

Joseph Rowlands graduated with First Class Honours for his experimental research in aeroacoustics, and is now focusing on quantum computing. His PhD will be under the supervision of UNSW scientist Professor Michelle Simmons, Director of the Centre of Excellence for Quantum Computation and Communication Technology, and 2018 Australian of the Year.

'Quantum computing will change the digital world by providing an exponential increase in computational power over traditional machines. This will create new industries, allow currently impossible research to be carried out, leading to new technologies not yet even imagined,' he says.

'Australia is leading this 'space race of the computing era'. For both economic and strategic reasons, it is imperative that Australia stay at the forefront of this exciting technological development.'

CQC2T Director Professor Michelle Simmons is Australian of the Year 2018

On behalf of all researchers and partners of CQC2T, we congratulate Scientia Professor Michelle Simmons, who was tonight named 2018 Australian of the Year in recognition of her pioneering research and inspiring leadership in quantum computing.

Professor Simmons, who is a UNSW Professor of Physics and Director of the Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology based at UNSW, was awarded the honour by the Australian Prime Minister, Malcolm Turnbull, at a ceremony at Parliament House in Canberra.

Chair of the Centre Advisory Committee, Peter Yates AM said “Michelle’s achievements and those of her team are hugely exciting for the recognition of science in Australia. Her leadership of the Centre and her field is an inspiration to us all’.

As Centre Director she leads a team of more than 200 researchers at eight Australian universities who are developing a suite of technologies for quantum computing, information storage and communications.

For further information click here

Now hiring more than 30 researchers and students

With $83 million of new commercial backing and in partnership with recently formed company Silicon Quantum Computing Pty Ltd, we are seeking 20 researchers, engineers and technicians from industry and academia to accelerate the commercialisation of our world-leading research in silicon quantum electronics. More than 10 PhD positions are also available.

View the full list of available roles.

Dr Jacq Romero named L'Oréal Australia women in science fellow

Dr Jacq Romero, a researcher in CQC2T's photonic quantum computation program at the University of Queensland, has been named one of five L'Oréal Australia women in science fellows. Romero was recognised for her work creating quantum “alphabets” using the orbital angular momentum of light.

CQC2T congratulates Dr Romero and the four other fellows.

See the full list of fellows in Cosmos Magazine

Learn more about Dr Romero's work

Large-scale quantum circuitry challenges can be overcome for electron spin qubits in quantum dots or donors

Prof Andrew Dzurak and Prof Andrea Morello have contributed to a review of approaches to quantum circuitry for semiconductor spin qubits showing that electron spin qubits in quantum dots or donors offer several opportunities to overcome the challenge of wiring up large qubit arrays.

Sparse qubit array with local electronics

The review was published in npj Quantum Information and concludes that continuous development of semiconductor technology is paving the way for the construction of a large-scale universal quantum computer.

Read the full article in npj Quantum Information

CQC2T partner explains motivation for quantum computing investment

Telstra's Chief Scientist Professor Hugh Bradlow explains the telco giant's commitment to becoming a world class technology company in this piece for Exchange. The company's long-term approach has seen it invest in Australia's first quantum computing company, Silicon Quantum Computing Pty Ltd.

Guests tour UNSW's quantum computing laboratories at the launch of Silicon Quantum Computing Pty Ltd

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 Telstra Exchange

CQC2T researchers are connecting up the global quantum internet

A team of researchers led by A. Prof Matthew Sellars at The Australian National University have shown that an erbium-doped crystal is a practical building block for a global quantum internet.

Dr Rose Ahlefeldt and A. Prof Matthew Sellars operating a high resolution dye laser (used to study rare earth crystals) in the solid state spectroscopy laboratory at ANU. Image credit: Stuart Hay, ANU

The material is uniquely suited to enable a global quantum telecommunications network, achieving coherence times of more than a second and operating in the same 1550nm band as existing fibre optic networks.

Read more

Access the full paper at Nature Physics.

Watch a video about the result.

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