From Moscow Institute of Physics and Technology [Московский Физико-Технический институт](RU): “Physicists made photons be friends with magnons”

From Moscow Institute of Physics and Technology [Московский Физико-Технический институт](RU)

06/22/2021

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Mounting a superconducting chip on a board. Credit: Andrey Zmeev, MIPT Press Office.

A team of scientists from MIPT and National University of Science and Technology MISiS (NUST) [ Национальный исследовательский университет “МИСиС”](RU) have developed and tested a new platform for realization of the ultra-strong photon-to-magnon coupling. The proposed system is on-chip and is based on thin-film hetero-structures with superconducting, ferromagnetic and insulating layers. This discovery solves a problem that has been on the agenda of research teams from different countries for the last 10 years, and opens new opportunities in implementing quantum technologies. The study was published in the highly ranked journal Science Advances.

The last decade has seen significant progress in the development of artificial quantum systems. Scientists are exploring different platforms, each with its own advantages and disadvantages. The next critical step for advancing quantum industry requires an efficient method of information exchange between platform hybrid systems that could benefit from distinct platforms. For example, hybrid systems based on collective spin excitations, or magnons, are being developed. In such systems magnons must interact with photons, standing electromagnetic waves trapped in a resonator. The main limiting factor for developing such systems is the fundamentally weak interaction between photons and magnons. They are of different sizes, and follow different dispersion laws. This size difference of a hundred times or more considerably complicates the interaction.

Vasily Stolyarov, deputy head of the MIPT Laboratory of Topological Quantum Phenomena in Superconducting Systems, commented: “We created two subsystems. In one, being a sandwich from superconductor/insulator/superconductor thin films, photons are slowed down, their phase velocity is reduced. In another one, which is also a sandwich from superconductor/ferromagnetic/superconductor thin films, superconducting proximity at both interfaces enhances the collective spin eigen-frequencies. The ultra strong photon-to-magnon coupling is achieved thanks to the suppressed photon phase velocity in the electromagnetic subsystem.”

Igor Golovchanskiy, leading researcher, senior researcher at the MIPT Laboratory of Topological Quantum Phenomena in Superconducting Systems, head of the NUST MISIS Laboratory of Cryogenic Electronic Systems, explained: “Photons interact very weakly with magnons. We managed to create a system in which these two types of excitations interact very strongly. With the help of superconductors, we have significantly reduced the electromagnetic resonator. This resulted in a hundred times reduction of the phase velocity of photons, and their interaction with magnons increased by several times.”

This discovery will accelerate the implementation of hybrid quantum systems, as well as open up new possibilities in superconducting spintronics and magnonics.

Except for the researchers from the MIPT Laboratory of Topological Quantum Phenomena in Superconducting Systems, the study involved scientists from NUST MISIS, the N.L. Dukhov All-Russian Scientific Research Institute of Automatics (RU), the Institute of Solid State Physics [Институт физики твердого тела], Russian Academy of Sciences [Росси́йская акаде́мия нау́к; (РАН) Rossíiskaya akadémiya naúk](RU); the Skobeltsyn Institute of Nuclear Physics (RU), the University of Glasgow (SCT) (UK), the University of Twente [ Universiteit Twente] (NL), and the KIT Karlsruhe Institute of Technology [Karlsruher Institut für Technologie] (DE).

This research was supported by the Ministry of Science and Higher Education of the Russian Federation, the Russian Science Foundation, and partially by the European Union Horizon 2020 program.

See the full article here .

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Moscow Institute of Physics and Technology [Московский Физико-Технический институт] (RU) is a leading Russian university that trains students in various fields of modern science and technology.
MIPT was set up on September 17, 1951 by Resolution#3517-1635 of the Soviet Cabinet of Ministers on the basis of the Department of Physics and Technology at the Lomonosov Moscow State University. The department started working on November 25, 1946. On October 1, 1951, the resolution was approvedby executive order of the Soviet Education Ministry. On November 2, 2009, MIPT was granted the status of National Research University by the Russian government.
MIPT has a very rich history. Its founders included academicians Pyotr Kapitsa, Nikolay Semenov and Sergey Khristianovich. Its first professors were Nobel Prize winners Kapitsa, Semenov and Lev Landau, and its first rector was Ivan Petrov. There are Nobel Prize winners among MIPT’s graduates as well. Many MIPT professors are leading Russian scientists, including over 80 members of the Russian Academy of Sciences.
From the outset, MIPT has used a unique system for training specialists, known as the Phystech System, which combines fundamental science, engineering disciplines and student research.
With a history rich in major events and longstanding traditions, MIPT pays well-deserved attention to its symbols. MIPT has an original emblem, which embodies its devotion to science.

Every 5 years MIPT marks two anniversaries, celebrating the creation of the Department of Physics and Technology at Moscow State University on November 25, 1946 and the creation of Moscow Institute of Physics and Technology, which took place five years later.