UNSW scientists have shown that their pioneering single atom technology can be adapted to building 3D silicon quantum chips – with precise interlayer alignment and highly accurate measurement of spin states. The 3D architecture is considered a major step in the development of a blueprint to build a large-scale quantum computer.
UNSW researchers at the Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) have shown for the first time that they can build atomic precision qubits in a 3D device – another major step towards a universal quantum computer.
The 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 is 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, team members were able to align the different layers in their 3D device with nanometer precision – and showed they could read out qubit states with what’s called ‘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 optimised 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 members 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 five nanometers, which is quite extraordinary,” Dr Keizer says.
Lastly, the researchers were able to measure the qubit output of the 3D device single shot – i.e. with a 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 milestone in the field.
“We are working systematically towards a large-scale architecture that will lead us to the eventual commercialisation of the technology.
Learn more: Quantum scientists demonstrate world-first 3D atomic-scale quantum chip architecture
The Latest on: 3D silicon quantum chips
[google_news title=”” keyword=”3D silicon quantum chips” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: 3D silicon quantum chips
- Chip Industry Week In Reviewon April 26, 2024 at 12:01 am
U.S. workforce hubs; Samsung's V-NAND chip; TSMC's A16 process and SoW; NVIDIA's AI acquisitions; IBM to acquire HashiCorp; China/Japan AI EV partnerships; MIT's secure digital IMC chip; a foundry ...
- How do we secure London's future as a tech hub? It starts with our peopleon April 23, 2024 at 4:23 am
How do we secure London's future as a tech hub? It starts with our people - City Voices: If London is to secure its future as an attractive destination for global players and local start-ups, a clear ...
- Symposium to showcase breakthroughs in microelectronicson April 23, 2024 at 1:50 am
IEEE Symposium on VLSI Technology & Circuits theme: “Bridging the Digital & Physical Worlds with Efficiency & Intelligence”.
- Fraunhofer inverter project boosts EV performanceon April 21, 2024 at 11:06 am
Fraunhofer IZM is working with project partners Porsche and Bosch, in a project called Dauerpower, to develop an electric inverter that can work at a lower operating temperature thanks to optimised ...
- Playbook: Why Biden world has gone quiet on the Trump trialon April 18, 2024 at 3:14 am
THE BUZZ OF THE LEGAL WORLD — “2 of Trump’s jurors are lawyers. Would they acquit on a technicality?” by Betsy Woodruff Swan: “The ‘totally uncommon’ prospect of two lawyers serving on the same jury ...
- 3 Stocks to Buy for 100X Gains Before the Next Tech Hype Cycleon April 15, 2024 at 11:55 am
These small-cap multi-bagger stocks have the potential to deliver massive gains during the next major tech hype cycle.More From InvestorPlace The #1 AI Investment Might Be This Company You’ve Never ...
- Manufacturing innovation centre focuses on electrificationon April 10, 2024 at 2:01 am
The Driving the Electric Revolution Industrialisation Centre (DER-IC) South West and Wales has opened its doors to industry, academia, and government.
via Bing News