Coherent coupling between a ferromagnetic magnon and a superconducting qubit

• Autores: Yutaka Tabuchi, Seiichiro Ishino, Atsushi Noguchi
• Localización: Science, ISSN 0036-8075, Vol. 349, Nº 6246, 2015, págs. 405-408
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Rigidity of an ordered phase in condensed matter results in collective excitation modes spatially extending to macroscopic dimensions. A magnon is a quantum of such collective excitation modes in ordered spin systems. Here, we demonstrate the coherent coupling between a single-magnon excitation in a millimeter-sized ferromagnetic sphere and a superconducting qubit, with the interaction mediated by the virtual photon excitation in a microwave cavity. We obtain the coupling strength far exceeding the damping rates, thus bringing the hybrid system into the strong coupling regime. Furthermore, we use a parametric drive to realize a tunable magnon-qubit coupling scheme. Our approach provides a versatile tool for quantum control and measurement of the magnon excitations and may lead to advances in quantum information processing.