Centre Updates

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.

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Access the full paper at Nature Physics.

Watch a video about the result.

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.

Quantum sheds new light on electron spin resonance techniques

A team led by CQC2T's Prof Lloyd Hollenberg at the University of Melbourne have demonstrated a dramatically improved electron spin resonance technique using the quantum properties of diamond.

Electron spin image of copper (II) ions in a patterned region of the diamond defined by the kangaroo. The scale bar in the image is 10 micrometers. Image credit: David Simpson

Hollenberg led an interdisciplinary team that improved the sensitivity of ESR by orders of magnitude compared to existing techniques using a non-invasive method. The technology will be used to understand biochemistry and could reveal how transition metal ions affect brain health.

Read more at Eurekalert.

Access the full paper at Nature Communications.

Researchers find quantum computations could be hidden

CQC2T's Dr Nick Menicucci is part of a team that have proposed cloud-based quantum computers could be used remotely without revealing the user's purpose and without the user having access to their own quantum resources.

Towards classically driven blind quantum computation. Credit: Timothy Yeo/Centre for Quantum Technologies, National University of Singapore

The work, published in Physical Review X, was part of a collaboration with researchers from the Centre for Quantum Technologies at the National University of Singapore and the Singapore University of Technology and Design. The team propose that concealing which steps in a series perform the desired calculation would be akin to hiding a needle in a haystack.

Read more at EurekAlert!

Access the full paper at Physical Review X.

Quantum probes dramatically improve detection of nuclear spins

CQC2T researchers at the University of Melbourne have demonstrated a way to detect nuclear spins non-invasively using quantum technology, providing a new tool for materials science and biotechnology.

A nitrogen-vacancy (dark blue) quantum probe performing nanoscale nuclear magnetic resonance (NMR) on molecular hydrogen. A green laser controls the quantum state of the probe, which is tuned to the resonant frequency of target nuclear spins. The probe responds to the nuclear spins of the hydrogen atoms and provides a direct measurement via the red light emitted. Image credit: David A. Broadway/cqc2t.org

The team, led by CQC2T Deputy Director Prof Lloyd Hollenberg, has used a quantum probe to perform microwave-free nuclear magnetic resonance (NMR) spectroscopy at the nanoscale. The new technique overcomes significant limitations with existing approaches.

Read more at EurekAlert!

Access the full paper at Nature Communications.

Mark Hogg wins UNSW Physics one minute thesis competition

CQC2T PhD student Mark Hogg is the winner of the UNSW Physics 2017 one minute thesis competition with his talk 'Building tomorrow's computers atom by atom'.

Mark and fellow CQC2T student Gabriele de Boo will go on to represent at the Science faculty competition in July.

Journal edited by Prof Simmons enters JCR as highest ranked in quantum information

npj Quantum Information (npjQI), edited by CQC2T Director Prof Michelle Simmons, has entered the highly regarded Journal Citation Report (login required) as the top ranked quantum information journal with an impact factor of 9.111.

npjQI is the first Nature Partner Journal to be published in Australia, and was launched by Minister for Education Christopher Pyne. The open source, multidisciplinary journal is published in partnership with UNSW Sydney and CQC2T.

The most viewed and shared articles since the first issue in October 2015 include Quantum algorithms: an overview, Majorana zero modes and topological quantum computation and Demonstration of a quantum advantage in machine learning.

Read UNSW's announcement at the university Newsroom.

Paper by Scott Lillie highlighted in Nature Nanotechnology

A recent paper by Scott Lillie from CQC2T's Melbourne node has been featured as a research highlight in the latest edition of Nature Nanotechnology. The paper on coherent control of a spin qubit in diamond, published in Physical Review Letters, was also selected as an Editor's Suggestion.

EMR schematic for driving of substitutional nitrogen (P1) centre electron spins (red) in bulk diamond. P1 centre nuclear spins (gray) lead to hyperfine splitting of the electron spin transition. Credit: Lillie et al

Read the full paper at Physical Review Letters.

Atomic-scale triumph: CQC2T researchers achieve high fidelity two-qubit readout with record spin times

High-fidelity sequential readout of two electron spins. Credit: Watson et al

Scaling up quantum computers remains one of the toughest challenges facing quantum computing research teams around the world. But new results published in Science Advances show that single-atom qubits in silicon can be engineered with atomic precision to have a five-fold increase in spin relaxation times.

These two-qubit devices are the only semiconductor-based qubits where both qubits have demonstrated the extremely high fidelities required for fault tolerant operation.

The two-qubit readout results were published in Science Advances.

Prof Simmons shares her vision of a quantum future at Vivid

Australia is well positioned to develop a practical quantum computer, said CQC2T director Michelle Simmons as she lauded Australia’s bright future in quantum computing at Sydney's Vivid Ideas festival.

Prof Simmons delivers the keynote address at ‘Creating a Quantum World’. Photo: Sally Maguire/Business Events Sydney

Professor Simmons, speaking at the Museum of Contemporary Art, said that Australia’s research ecosystem has created a unique advantage in the field of quantum science and nanotechnology, citing six quantum-related Australian Research Council Centres of Excellence as an example.

"Fifteen to 20 years ago we saw that rapid improvements in today’s computers were coming to an end, and we saw the promise of quantum, so Australia is now able to take advantage of the skills and technology we’ve developed in that time,” she said.

Read more at the UNSW Sydney Newsroom.