Improved manufacturing technology paves the way for improved quantum devices

Schematic of a superconducting circuit imaged using a terahertz scanning near-field microscope.Credit: University of Queensland

Physicists and engineers have found a way to identify and address material defects as one of the most promising technologies in commercial quantum computing.

The University of Queensland team was able to develop and optimize treatments Manufacturing Common method protocol for building Superconducting circuit On a silicon chip.

Dr. Peter Jacobson, who co-led the research, said the team had defects introduced during manufacturing. circuit..

“Superconducting quantum circuits are attracting attention from big companies like Google and IBM, but the phenomenon of information loss,’decoherence’, is hampering widespread application,” he said.

“Decoherence is mainly due to the interaction between superconducting circuits and silicon chips (physical problems) and material defects introduced during manufacturing (engineering problems).”

“Therefore, finding a solution required feedback from physicists and engineers.”

The team used a method called the terahertz scan near field Optical microscope (THz SNOM)- Atomic force microscope Combine with THz light source and detector.

This provides a combination of high spatial resolution down to virus size and local spectroscopic measurements.

Professor Alexander Rakić said the technology allowed probing on the nanoscale rather than the macroscale by concentrating light on the tip of the metal.

“This provides new access to understanding where the defects are, reducing decoherence and reducing the loss of superconducting quantum devices,” says Professor Rakitch.

“It turns out that commonly used manufacturing recipes unintentionally flaw silicon chips, which causes decoherence.”

“We also showed that surface treatment reduces these defects, which in turn reduces the loss of superconducting quantum circuits.”

Associate Professor Arkadi Fedorov said this would allow the team to determine where defects were introduced in the process and optimize manufacturing protocols to address them.

“Our method enables the same Terminal It requires multiple probes, as opposed to other methods that often require the device to be disconnected before it can be probed, “says Dr. Fedorov.

“The team’s results provide a way to improve superconducting devices for use in quantum computing applications.”

In the future, THz SNOM can be used to define new ways to improve the behavior of quantum devices and their integration into viable quantum computers.

The results are published in Applied Physics Letter..

Combining light and superconductors may improve AI capabilities

For more information:
Xiao Guo et al, Proxia field terahertz nanoscopy of coplanar microwave cavities, Applied Physics Letter (2021). DOI: 10.1063 / 5.0061078

Quote: Improved manufacturing technology is an improved quantum device acquired from on September 1, 2021 ( 2021, September 1st)

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Improved manufacturing technology paves the way for improved quantum devices

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