Time-resolved measurements of surface spin-wave pulses at millikelvin temperatures

TL;DR

This study demonstrates detailed time-resolved measurement of surface spin-wave pulses in YIG at millikelvin temperatures, revealing low-temperature magnon dynamics and potential for quantum information applications.

Contribution

First experimental investigation of pulsed magnon propagation in YIG at millikelvin temperatures with high signal quality.

Findings

Successful observation of spin-wave pulse propagation at millikelvin temperatures

Insights into low-temperature magnon dynamics in YIG

Potential applications in solid-state quantum information processing

Abstract

In this work, we experimentally investigate the propagation of pulsed magnetostatic surface spin-wave (magnon) signals in an yttrium iron garnet (YIG) waveguide at millikelvin temperatures. Our measurements are performed in a dilution refrigerator at microwave frequencies. The excellent signal-to-noise ratio afforded by the low-temperature environment allows the propagation of the pulses to be observed in detail. The work gives insight both into low-temperature magnon dynamics in YIG and the potential application of systems of propagating magnons to solid-state quantum information processing.