Superconducting Qubit And Magnetic Sphere Hybrid Created

It has been proven possible to exchange a quantum bit, the minimum unit of information used by quantum computers, between a superconducting quantum-bit circuit and a quantum in a magnet called a magnon, by researchers at the University of Tokyo. The result is expected to contribute to the development of quantum interfaces and quantum repeaters.

Magnets, often used in our daily life, exert a magnetic force produced by a large number of microscopic magnets, the spins of individual electrons, that are aligned in the same orientation. The collective motions of the ensemble of spins are called spin waves.

A magnon is a quantum of such excitations, similar to a photon as a quantum of light, i.e., the electromagnetic wave. At room temperature the motions of electron spins can be largely affected by heat.

Fluctuation Quantum Limit

The properties of individual magnons have not been studied at low temperatures corresponding to the “quantum limit” where all thermally-induced spin fluctuations vanish.

Now, the research group of Professor Yasunobu Nakamura at the University of Tokyo Research Center for Advanced Science and Technology has succeeded for the first time to couple a magnon in a magnet to a photon in a microwave cavity at an ultralow temperature near absolute zero (-273.14 degrees centigrade).

They observed coherent interaction between a magnon and a microwave photon by placing a millimeter-sized ferromagnetic sphere made of yttrium iron garnet in a centimeter-scale microwave cavity.

A magnet (ytterium iron garnet; YIG) and a superconducting qubit was placed with a separation of 4 cm. The electric field in the cavity interacted with the qubit, while the magnetic field interacted with the magnet.

At an extremely low temperature of around -273 degrees centigrade, magnons, i.e., quanta of the fluctuations in the magnet, coherently couple with the qubit through the electromagnetic field of the cavity.

Magnons In Spintronics Devices

The group placed the magnet together with the superconducting qubit in a cavity and demonstrated exchange of information between the magnon and superconducting qubit mediated by the microwave cavity.

Furthermore, the team demonstrated coherent coupling of a magnon to a superconducting quantum-bit circuit. The latter is known as a well-controllable quantum system and as one of the most promising building blocks for quantum processors.

The results will stimulate research on the quantum behavior of magnons in spintronics devices and open a path toward realization of quantum interfaces and quantum repeaters.

[thrive_text_block color=”light” headline=””]Y. Tabuchi, S. Ishino, A. Noguchi, T. Ishikawa, R. Yamazaki, K. Usami, Y. Nakamura.
Coherent coupling between a ferromagnetic magnon and a superconducting qubit.
Science, 2015; 349 (6246): 405 DOI: 10.1126/science.aaa3693[/thrive_text_block]

Illustration: Copyright 2015 Yutaka Tabuchi