Quantum scientists demonstrate world-first 3D atomic-scale quantum chip architecture

These are study authors Professor Michelle Simmons and Joris Keizer, UNSW Sydney. Credit: UNSW Sydney

The team of researchers, led by 2018 Australian of the Year and Director of CQC2T Professor Michelle Simmons, have demonstrated that they can extend their atomic qubit fabrication technique to multiple layers of a silicon crystal – achieving a critical component of the 3D chip architecture that they introduced to the world in 2015. This new research was published today in Nature Nanotechnology.

The group is the first to demonstrate the feasibility of an architecture that uses atomic-scale qubits aligned to control lines – which are essentially very narrow wires – inside a 3D design.

What's more, the team was able to align the different layers in their 3D device with nanometer precision – and showed they could read out qubit states single shot, i.e. within one single measurement, with very high fidelity.

“This 3D device architecture is a significant advancement for atomic qubits in silicon,” says Professor Simmons. “To be able to constantly correct for errors in quantum calculations – an important milestone in our field – you have to be able to control many qubits in parallel.

“The only way to do this is to use a 3D architecture, so in 2015 we developed and patented a vertical crisscross architecture. However, there were still a series of challenges related to the fabrication of this multi-layered device. With this result we have now shown that engineering our approach in 3D is possible in the way we envisioned it a few years ago.”

In this paper, the team has demonstrated how to build a second control plane or layer on top of the first layer of qubits.

“It's a highly complicated process, but in very simple terms, we built the first plane, and then optimized a technique to grow the second layer without impacting the structures in first layer,” explains CQC2T researcher and co-author, Dr Joris Keizer.

“In the past, critics would say that that's not possible because the surface of the second layer gets very rough, and you wouldn't be able to use our precision technique anymore – however, in this paper, we have shown that we can do it, contrary to expectations.”

The team also demonstrated that they can then align these multiple layers with nanometer precision.

“If you write something on the first silicon layer and then put a silicon layer on top, you still need to identify your location to align components on both layers. We have shown a technique that can achieve alignment within under 5 nanometers, which is quite extraordinary,” Dr Keizer says.

Lastly, the researchers were able to measure the qubit output of the 3D device with what's called single shot – i.e. with one single, accurate measurement, rather than having to rely on averaging out millions of experiments. “This will further help us scale up faster,” Dr Keizer explains.

Towards commercialisation

Professor Simmons says that this research is a major milestone in the field.

“We are working systematically towards a large-scale architecture that will lead us to the eventual commercialisation of the technology.

“This is an important development in the field of quantum computing, but it's also quite exciting for SQC,” says Professor Simmons, who is also the founder and a director of SQC.

Since May 2017, Australia's first quantum computing company, Silicon Quantum Computing Pty Limited (SQC), has been working to create and commercialise a quantum computer based on a suite of intellectual property developed at CQC2T and its own proprietary intellectual property.

“While we are still at least a decade away from a large-scale quantum computer, the work of CQC2T remains at the forefront of innovation in this space. Concrete results such as these reaffirm our strong position internationally,” she concludes.

Media Contact

Isabelle Dubach
i.dubach@unsw.edu.au
61-432-307-244

 @UNSWnews

http://www.unsw.edu.au 

Media Contact

Isabelle Dubach EurekAlert!

Alle Nachrichten aus der Kategorie: Physics and Astronomy

This area deals with the fundamental laws and building blocks of nature and how they interact, the properties and the behavior of matter, and research into space and time and their structures.

innovations-report provides in-depth reports and articles on subjects such as astrophysics, laser technologies, nuclear, quantum, particle and solid-state physics, nanotechnologies, planetary research and findings (Mars, Venus) and developments related to the Hubble Telescope.

Zurück zur Startseite

Kommentare (0)

Schreib Kommentar

Neueste Beiträge

High-thermoresistant biopolyimides become water-soluble like starch

This is the first report for the syntheses of water-soluble polyimides which are Interestingly derived from bio-based resources, showing high transparency, tunable mechanical strength and the highest thermoresistance in water-soluble…

Land management in forest and grasslands

How much can we intensify? A first assessment of the effects of land management on the links between biodiversity, ecosystem functions and ecosystem services. Ecosystem services are crucial for human…

A molecular break for root growth

The dynamic change in root growth of plants plays an important role in their adjustment to soil conditions. Depending on the location, nutrients or moisture can be found in higher…

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close