Best Poster Award: FMN Laboratory developments at the third International School of quantum technologies QTS 2020

A team of young scientists of FMN Laboratory took part in the 3rd international School of quantum technologies, organized annually by the Center for Quantum Technologies of Lomonosov Moscow State University. The poster of our graduate student Dmitry Moskalev, devoted to the development of technology for creating parametric microwave amplifiers (“FABRICATION AND CHARACTERIZATION OF NEAR QUANTUM-LIMITED JOSEPHSON PARAMETRIC MICROWAVE AMPLIFIER”), named the best.

Within the framework of the School, the FMN Laboratory team delivered a comprehensive presentation of the center's achievements in the field of creating quantum processors based on a superconducting element base.

Josephson parametric amplifiers are of great interest to leading world groups due to their ability to operate at extremely low temperatures, providing a quantum noise level. Due to this, parametric amplifiers play a significant role in reading signals from superconducting qubits. In his poster, Dmitry Moskalev revealed the key stages of manufacturing a parametric amplifier: from lithography, shadow deposition, and creating a reproducible tunnel barrier in Josephson Junctions using bandage technology to measurements.

Details from D. Moskalev's poster on measuring the characteristics of a parametric amplifier

Anastasia Pishchimova, a research scientist at the center and a graduate student at BMSTU, shared the results of research in the field of creating epitaxial Josephson Junctions and the novel technique for the manufacture of superconducting qubits (the poster “IMPROVEMENT OF THE COHERENCE TIME BY JOSEPHSON JUNCTION OPTIMIZATION”). It includes the deposition of sacrificial bilayer inorganic mask, metal layer etching, wet etching to form undercut, mono Al deposition and wet removing of sacrificial layers.

Superconducting microwave resonators are one of the key elements of the architecture of a quantum processor based on superconductors. In his work (poster “FABRICATION-INDUCED DECOHERENCE IN SUPERCONDUCTING COPLANAR WAVEGUIDE RESONATORS”), Nikita Smirnov, a junior researcher at FMN Lab, outlined the key features of the design and production of resonators: from surface cleaning and optimization of optical lithography to the formation of airbridges and measurements.

Despite the promise of research and the large scale of the results achieved by leading scientific groups, developers of superconducting quantum processors still face a number of limitations associated with losses in superconducting quantum circuits. Alina Dobronosova, a leading engineer of the center and graduate student of BMSTU, in her poster (“LOW-DECOHERENCE PLANAR SUPERCONDUCTING JOSEPHSON QUBITS FOR QUANTUM INTEGRATED CIRCUITS”) outlined the ways to solve these problems and presented the complete manufacturing technology of superconducting qubit circuits developed by the team: from etching to measurements in a dissolution cryostat.

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The school of quantum technologies 2020 took place for the third year in a row and attracted students, young scientists, the best teachers from all over Russia, Russian-speaking scientists from around the world and eminent foreign experts, which brought the event to an international level.

The school is traditionally held in Sochi, the capital of the 2014 Winter Olympic Games, in the ski resort of Krasnaya Polyana, Rosa Khutor.