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Tests show integrated quantum chip operations



From left to right: dr. Bas Hensen, Professor Dzurak, dr. Kok Wai Chan and former graduate student Michael Fogarty, the lead author of the article. Credit: Paul Henderson-Kelly

Quantum computers capable of solving complex problems such as drug design or machine learning will require millions of quantum bits ̵

1; or qubits – that are integrated and correct for errors that are inevitable in fragile quantum systems.

Now an Australian research team has experimentally realized a crucial combination of these capabilities on a silicon chip and brought the dream of a universal quantum computer closer to reality.

They demonstrated an integrated silicon qubit platform that combines both – spin-addressability – the ability to "write" information about a single spin qubit without disturbing its neighbors – and a qubit "readout" Process, which is crucial for quantum error correction.

In Addition, Their New Integrated Design May Be

The team is headed by Scientia Professor Andrew Dzurak of the University of New South Wales, Sydney, a program director at the Center of Excellence for Quantum Computation Technology (CQC2T) and director of the NSW Node of the Australian National Fabrication Facility

Last year, Dzurak and colleagues published a design for a Nove l A chip architecture that enables quantum calculations to be performed using complementary metal-oxide-semiconductor (CMOS) components. the basis of all modern computer chips.

In their study Nature Communications published today, the team combines for the first time two fundamental quantum techniques and confirms the promise of their approach.

Dzurak's team had also previously demonstrated that an integrated silicon qubit platform can operate with single-spin addressability – the ability to rotate a single spin without disturbing its neighbors.

They have now shown that they can combine this with a special kind of quantum readout process known as Pauli spin blockade, and a key requirement for quantum error correction codes is large spin-based quantum computers. This new combination of qubit readout and control techniques is a key feature of their quantum chip design.

"We have shown that in our silicon qubit device we can perform Pauli's spin read, but for the first time combined with spin resonance to control the spin," says Dzurak.

"This is an important milestone for us on the way to quantum error correction with spin qubits, which will be essential for any universal quantum computer."

"Quantum error correction is a key requirement for creating a large-scale quantum computer, since all qubits fragile and errors must be corrected as they emerge, "says lead author Michael Fogarty, who has done the experiments part of his Ph.D. Research with Professor Dzurak at UNSW

"But this creates a significant overhead in the number of physical qubits you need to get the system up and running," says Dzurak.

Dzurak says, "Through the use of silicon CMOS technology, we have the ideal platform to scale to the millions of qubits we'll need, and our recent results provide us with the tools to create a near future It is further confirmation that we are on the right side, and it also shows that the architecture that we have developed at UNSW has not hindered the development of a

"And one more thing you can make well"

CQC2T's unique approach using silicon

Working with silicon is not only important because the item is cheap and abundant, but also because it is at the center of interest global computer industry for nearly 60 years. The properties of silicon are well understood and chips containing billions of conventional transistors are routinely manufactured in large scale manufacturing facilities.

Three years ago, Dzurak's team published in the journal Nature the first demonstration of quantum logic calculations into a true silicon device with the creation of a two-qubit logic gate – the central building block of a quantum computer.

"These were the first small steps, the first demonstrations of how to turn this radical quantum computer concept into a practical one. The device uses components that underlie all modern computers," says Professor Mark Hoffman, Dean of the US engineering firms.

"Our team now has a blueprint for drastic scaling."

"We have tested elements of this design in the lab, with very positive results. We just have to build on it – which is still a big challenge, but the groundwork is there and it is very encouraging.

"It will still take great technology to bring quantum computing to commercial reality. Work that we see from this extraordinary team at CQC2T places Australia in the driver's seat," he added.

Other authors of the new Nature Communications paper are UNSW researchers Kok Wai Chan, Bas Hensen, Wu Huang, Tuomo Tanttu, Henry Yang, Arne Laucht, Fay Hudson and Andrea Morello, as well as Menno Veldhorst of QuTech and TU Delft, Thaddeus Ladd of HRL Laboratories and Kohei Itoh of the Japanese Keio University.

Commercialization of CQC2T Intellectual Property

In 2017, a consortium of Australian governments, industry and universities founded Australia's first quantum computer company to commercialize CQC2T's world-leading intellectual property.

Commissioning of a new laboratory The Silicon Quantum Computing Pty Ltd (SQC), Silicon Quantum Computing Pty Ltd (SQC), is aiming for a 10-qubit silicon demonstrator by 2022 as a harbinger for the manufacture of a silicon-based quantum computer

The work of Dzurak and his team will be a component of SQC that achieves this ambition. UNSW scientists and engineers at CQC2T are developing parallel patented approaches using quantum dots with single atoms and quantum dots.

In May 2018, then Australian Prime Minister Malcolm Turnbull and French President Emmanuel Macron announced the signing of an agreement to Memorandum of Understanding (MoU) for a new collaboration between SQC and the world's leading French research and development organization Commissariat à l & # 39 Energy Atomique et aux Energies Alternatives (CEA).

The MoU outlined plans to establish a joint venture in silicon CMOS quantum computing technology to accelerate and focus technology development and capture commercialization opportunities – bringing together French and Australian efforts to develop a quantum computer.

The proposed Australian-French joint venture would bring together Dzurak's team at UNSW, with a team led by Dr. Ing. Maud Vinet of CEA, experts in advanced CMOS manufacturing technology, and recently a silicon qubit was also recently demonstrated using its industrial prototyping facility in Grenoble.

It is estimated that industries accounting for about 40% of the current Australian economy could be significantly influenced by quantum computing

machine learning, planning and logistic planning, financial analysis, stock market modeling, software and hardware verification, climate modeling, fast design and drug testing, as well as early detection and prevention of disease.


Further information:
Tuning in Quantum: Scientists decode the signal frequency control of precision atom qubits

Further information:
M.A. Fogarty et al., Integrated Silicon Qubit Platform with Single-Spin Addressability, Exchange Control and Single-Shot Singlet-Triplet Readout, Nature Communications (2018). DOI: 10.1038 / s41467-018-06039-x


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