UNSW researchers at the Center of Excellence for the Quantum Computation and Communication Technology (CQC2T) showed for the first time that they can build qubits atomic precision 3D device – another important step towards universal quantum computer .
The team & # 39; researchers, led by Australian of 2018 Year and Director Professor CQC2T Michelle Simmons, showed that can extend fabrication techniques of their atomic qubit to multiple layers & # 39 ; crystal silicon – get critical component of 3D chip architecture are introduced to the world in 2015. This new research published today in 2005 The Nature Nanotechnology.
The group is the first to demonstrate the feasibility of & # 39; architecture that uses qubits at atomic aligned with lines & # 39; control – which are essentially very narrow wires – 3D interior design.
In addition, the team was able to match the different layers in their 3D devices with nanometer precision of – and have proven to & # 39; read one shot qubit states, ie one measurement, very high confidence .
"This architecture & # 39; 3D device is a significant advancement for atomic quibits in silicon," says Professor Simmons. "To be able to & # 39; to constantly correct errors in kwantistiċi – an important step in our field calculations – to be able to control many qubits b & # 39; parallel.
"The only way to do this is to use & # 39; 3D architecture, so in 2015 we developed and brevettajna vertical architecture and widespread. However, there was still a series of & # 39; to manufacture related challenges & # 39; with this device & # 39; various levels. B & # 39; this result we have now shown that our engineering approach in 3D is possible slowly bennejna few years ago. "
F & # 39; this document, the team showed how to build a second & # 39; control plan or layer on the first layer & # 39; qubits.
"It is a very complicated process, but in & # 39; very simple terms, we have built the first plane, and then ottimizzajna technique to grow a second layer without impact on the structures in the first layer," explains the researcher and co-author & # 39; CQC2T, Dr. Joris Keizer.
"In the past, critics say that this is not possible because the top tier becomes very rough, and you can not use our technical precision more – however, in this document, we have shown that we can do contrary to expectations. "
The team also showed that these can then align with multiple layers of nanometer precision.
"If you write something on the first silicon layer and then put a layer of silicon on top, still need to identify your location to align components on both layers. We have proven technique that you & # 39; achieve alignment below 5 nanometers, which is quite extraordinary, "says Dr. Keizer.
Finally, the researchers were able to measure the qubit production of 3D devices with & # 39; what is called one shot – that one precise measurements, rather than having to rely on the average of millions of experiments. "This will help us we will increase faster," explains Dr. Keizer.
Professor Simmons says that this research is an important step in the field.
"We are working systematically to large-scale architecture that leads to the eventual commercialization of the technology.
"This is an important development in the field of quantum calculation, but it is also exciting to SQC," says Professor Simmons, who is also the founder and director & # 39; the SQC.
Since May 2017, the first computer company Australia, Silicon Quantum Computing Pty Limited (SQC), has been working to develop and commercialize quantum computer based on a set & # 39; intellectual property developed in & # 39; CQC2T and own proprietary intellectual property.
"While still at least a decade & # 39; away from large-scale quantum computer, out of work remains CQC2T & # 39; at the forefront of innovation in & # 39; this space. Concrete results as they reaffirm the position b & # 39; Our robust internationally, "concludes.