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Comptes Rendus Physique
Volume 17, n° 7
pages 729-739 (août 2016)
Doi : 10.1016/j.crhy.2016.07.009
Quantum magnonics: The magnon meets the superconducting qubit
La magnonique des quanta : Le magnon rencontre le qubit supraconducteur

Yutaka Tabuchi a, , Seiichiro Ishino a, Atsushi Noguchi a, Toyofumi Ishikawa a, Rekishu Yamazaki a, Koji Usami a, Yasunobu Nakamura a, b
a Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan 
b Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198, Japan 

Corresponding author.

The techniques of microwave quantum optics are applied to collective spin excitations in a macroscopic sphere of a ferromagnetic insulator. We demonstrate, in the single-magnon limit, strong coupling between a magnetostatic mode in the sphere and a microwave cavity mode. Moreover, we introduce a superconducting qubit in the cavity and couple the qubit with the magnon excitation via the virtual photon excitation. We observe the magnon–vacuum-induced Rabi splitting. The hybrid quantum system enables generation and characterization of non-classical quantum states of magnons.

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Nous appliquons les techniques de l'optique quantique micro-onde aux excitations collectives des spins d'une sphère macroscopique d'un isolant ferromagnétique. Nous mettons en évidence, dans la limite d'une unique excitation magnonique, le couplage fort entre un mode magnétostatique de la sphère et un mode d'une cavité micro-onde. En outre, nous avons ajouté un bit quantique supraconducteur à la cavité, ce qui permet de coupler ce bit quantique au mode de magnon, via l'échange virtuel d'un photon. Nous observons ainsi un anticroisement des fréquences de résonance du magnon et de la cavité. Cette plateforme hybride permet la création et la caratérisation d'états non classiques de magnons.

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Keywords : Magnon, Ferromagnet, Yttrium-iron garnet, Superconducting qubit, Microwave, Quantum optics

Mots-clés : Magnon, Ferromagnétisme, Grenat de fer et d'yttrium, Bits quantiques supraconducteurs, Micro-ondes, Optique quantique

1  To be more precise, we may say that surface plasmon polaritons, i.e., quanta of the hybridized modes of the surface charge density waves on the electrodes and the electromagnetic waves in the vacuum, are manipulated in the circuits.

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