Introducing Coherent Time Control to Cavity Magnon Polartion Modes

By connecting light to magnetism, cavity-magnon-polaritons (CMPs) [1-3] can link quantum computation to spintronics. Consequently, CMP-based information processing devices have thrived over the last years, but have almost exclusively been investigated with single-tone spectroscopy. However, universal computing applications will require a dynamic control of the CMP on demand and within nanoseconds. In this work [4], we perform fast manipulations of the different CMP modes with independent but coherent pulses to the cavity and magnon system. We change the state of the CMP from the energy exchanging beat mode to its normal modes and further demonstrate two fundamental examples of coherent manipulation: First, a dynamic control over the appearance of magnon-Rabi oscillations, i.e., energy exchange, and second, energy extraction by applying an anti-phase drive to the magnon. Our results show a promising approach to control different building blocks for a quantum internet and pave the way for further magnon-based quantum computing research.
[1] H. Huebl et al. Physical Review Letters, 111, 127003 (2013)
[2] X. Zhang et al. Physical Review Letters, 113, 156401 (2014)
[3] Y. Tabuchi et al. Physical Review Letters,113, 083603, (2014)
[4] T. Wolz et al. arXiv 1906.08103 (2019)