Magnonic Architectures for Quantum Circuits and Measurements.

The development of 2- and 3-dimensional circuit architectures for experiments at millikelvin temperatures aimed at exploring and exploiting magnonic systems at the quantum level is fast becoming an established area of magnetics research. Magnons are readily excited over the frequency range used by established solid-state quantum circuit technology and couple readily to EM fields. These facts, in combination with the field-tunable dispersion of the excitations make them an interesting proposition in the context of quantum device design. In this talk, we discuss recent progress made in the combination of planar superconducting circuit technology with magnon systems. We discuss the technical and materials requirements of successful magnonic experiments at millikelvin temperatures. We go on to describe experimental investigations including the study of spin-wave propagation in magnetic waveguides at the single magnon level [1, 2], the investigation of magnon modes in spherical magnetic resonators [3], the measurement of magnonic crystals, and the development of systems incorporating Josephson junction based qubits.

[1] A. Karenowska et al., arXiv:1502.06263 (2014). [2] A. van Loo et al., arXiv:1610.08402 (2016). [3] R. Morris et al., Scientific Reports, 7, 11511 (2017).