Ultralong-living magnons in the quantum limit.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 42066075.
- Also identified by DOI 10.1126/sciadv.aee2344 and PMC identifier 13134583.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Solid-state platforms based on bosonic quasiparticles offer a compelling route toward on-chip quantum information technologies scalable to nanometer dimensions. Coherence time, a key figure of merit for any quantum system, is fundamentally limited by the lifetime of quasiparticles that store quantum information. For magnons-bosonic excitations of collective magnetization dynamics-it has long been reported that their lifetime does not exceed a few hundred nanoseconds, placing a stringent constraint on their use in quantum architectures. Here, we demonstrate magnon lifetimes exceeding 18 microseconds. Experiments performed on single-crystal yttrium iron garnet spheres cooled to 30 millikelvin reveal relaxation times of short-wavelength magnons nearly two orders of magnitude longer than previously observed. These findings overturn the established view of magnon dissipation limits, positioning magnons as viable, long-lived information carriers for solid-state quantum computing.