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German scientists have invented qubits made of granular aluminum - they turned out to be much more stable than others.

Published: 2023-01-18

The potential advantages of quantum calculations with the simultaneous representation of each qubit with an infinite number of options from 0 to 1 are offset by their extreme instability. Scientists all over the world are looking for a way to extend the quantum states of qubits to the possibility of running complex algorithms on them. We are talking at least about seconds, not to mention a longer time. Perhaps German scientists, who have proposed a new type of qubits, can help with this.

Researchers at the Karlsruhe Institute of Technology have developed superconducting qubits, which they call “gralmonium” qubits, after the fluxonium qubits already developed. Traditionally, superconducting qubits use the so-called Josephson effect and a structure (junction) called a Josephson junction. Quantum states on such contacts remain unchanged the longer, the fewer defects in the material. But to determine the purity of the material can be up to a certain extent. The development of German scientists promises to help with this and bring superconducting quantum qubits to a new level of stability.

It is reported that instead of two aluminum plates separated by a dielectric layer, on which a Josephson junction is usually built, the researchers took granular aluminum with grain sizes of several nanometers and placed it in an oxide framework. After the process of self-organization, many microscopic Josephson junctions appeared in the structure of the material, which made it possible to detect the smallest defects in the material. The 20-nm Josephson contact, like a magnifying glass, revealed all previously indistinguishable defects, the scientists noted.

Such a small Josephson junction opens the way to a significant improvement in the properties of qubits, including an increase in their stability. The development is patented and is waiting for its development, which, obviously, will follow soon.