Quantum Magnonics

Spin waves — magnetization waves propagating in magnetic materials — are fascinating excitations with an unconventional combination of properties such as nonlinearity, tunable frequencies and dispersion relations, and the ability to couple efficiently to multiple degrees of freedom, from superconducting and spin qubits to phonons, microwaves, or optical photons. Spin waves have been extensively studied in the classical domain due to their potential applications in classical information processing, but they are not fully understood in the quantum regime.

Our team aims at developing a quantum theoretical description of magnons and to determine to which extent these excitations can be an asset in hybrid quantum platforms. We also aim at proposing experiments to generate and certify quantum magnonic states in nanostructures. This requires to develop models for magnon generation, decoherence, and detection by combining techniques from quantum nanophotonics, open quantum systems, and classical magnonics. It also requires close collaboration with experimental colleagues

Latest Publications in Magnonics

Magnetic anisotropy and GGG substrate stray field in YIG films down to millikelvin temperatures
Rostyslav O. Serha, Andrey A. Voronov, David Schmoll, Roman Verba, Khrystyna O. Levchenko, Sabri Koraltan, Kristýna Davídková, Barbora Budinska, Qi Wang, Oleksandr V. Dobrovolskiy, Michal Urbánek, Morris Lindner, Timmy Reimann, Carsten Dubs, Carlos Gonzalez-Ballestero, Claas Abert, Dieter Suess, Dmytro A. Bozhko, Sebastian Knauer, Andrii V. Chumak
npj spintronics 2, 29 (2024)

Strongly Coupled Spin Waves and Surface Acoustic Waves at Room Temperature
Y. Hwang, J. Puebla, K. Kondou, C. Gonzalez-Ballestero, H. Isshiki, C. Sánchez Muñoz, L. Liao, F. Chen, W. Luo, S. Maekawa, Y. Otani
Physical Review Letters 132, 056704 (2024)

Generation of Spin Wave Pulses by Inverse Design
S. Casulleras, S. Knauer, Q. Wang, O. Romero-Isart, A. Chumak, C. Gonzalez-Ballestero
Phys. Rev. Applied 19, 064085 (2023)

Quantum interfaces between magnons and paramagnetic spins
C. Gonzalez-Ballestero, O. Romero-Isart
In Roadmap on Spin Wave Computing, IEEE Transactions on Magnetics 58, 1 (2022)

Towards a Quantum Interface between spin waves and paramagnetic spin baths
C. Gonzalez-Ballestero, T. van der Sar, O. Romero-Isart
Physical Review B 105, 075410 (2022)