Towards a quantum interface between spin waves and paramagnetic spin baths
Carlos Gonzalez-Ballestero, Toeno van der Sar, Oriol Romero‐Isart
Abstract
Spin waves are prime candidates for information processing. The recent demonstration of their coupling to dense ensembles of solid-state spins paves the way toward coherent spin wave control in a similar fashion as, e.g., slow light in optics. Here, the authors provide a quantum theory describing mutual backaction between spin waves and spin ensembles and predict that external control of the latter enables to largely and dynamically modify spin wave properties such as propagation length. They also propose localized spin ensembles as spin wave sensors able to detect even vacuum spin-wave fluctuations. These results pave the way toward nanophotonics-inspired magnonic devices and protocols.