Physicists at the University of Vienna have found magnons with lifespans which can be 100 instances longer.
Magnons are tiny waves of magnetization that transfer by strong magnetic supplies, comparable to ripples spreading throughout water after a stone falls in. Unlike photons, which might transfer by empty area or optical fibers, magnons journey inside magnetic solids.
Their wavelengths can shrink to the nanometer scale, which suggests magnonic circuits might, in concept, match onto chips as small as these utilized in fashionable smartphones. Because magnons are excitations inside a strong, they’ll naturally work together with many different elementary quasiparticles, together with phonons and photons, making them promising parts for hybrid quantum methods and quantum metrology.
The primary limitation has been their extraordinarily quick lifetime. Until now, magnons might reliably carry quantum info for less than a few hundred nanoseconds at finest, which is way too temporary for sensible quantum computing.
The team led by Wiener has now reported a major advance, measuring magnon lifetimes of up to 18 microseconds, almost one hundred times longer than any previous observation, paving the way for a quantum computer the size of a 1-cent coin. At that scale, magnons stop behaving like short-lived signals and begin to resemble dependable carriers of quantum information, comparable to the superconducting qubits used in today’s leading quantum processors. The findings were recently published in the journal Science Advances.
Colder crystals revealed the limit
The advance came from combining two strategies. First, instead of using conventional uniform magnons, the team generated short wavelength magnons, which are naturally less affected by defects on the crystal surface. Those surface defects had limited magnon lifetimes in earlier experiments.
Second, the researchers placed extremely pure spheres of yttrium iron garnet (YIG) inside a mixed phase cryostat and cooled them to just 30 millikelvin, only a tiny fraction above absolute zero. At such low temperatures, the thermal processes that normally destroy magnons are effectively frozen out.
The team also showed that the remaining limit on magnon lifetime is not set by a basic law of physics. Instead, it depends on tiny trace impurities inside the crystal. The researchers tested three spheres with different purity levels and found a clear pattern: purer material allowed magnons to last longer. Even the least pure sample outperformed all previous records. That means future improvements may depend mainly on better materials science rather than on uncovering new physics.
What this means for quantum technology
A lifetime of 18 microseconds could turn magnons from weak intermediate links into strong quantum memories and efficient communication channels on a chip. They may be able to connect hundreds of qubits through a shared pathway, serving as a long awaited quantum bus for scalable quantum computers.
Because magnons exist in a solid material and can interact with many different quantum systems, they could also act as universal translators in hybrid quantum architectures, connecting technologies that otherwise cannot easily communicate with one another.
Reference: “Ultralong-living magnons in the quantum limit” by Rostyslav O. Serha, Kaitlin H. McAllister, Fabian Majcen, Sebastian Knauer, Timmy Reimann, Carsten Dubs, Gennadii A. Melkov, Alexander A. Serga, Vasyl S. Tyberkevych, Andrii V. Chumak and Dmytro A. Bozhko, 1 May 2026, Science Advances.
DOI: 10.1126/sciadv.aee2344
This material is based on the work supported by the National Science Foundation under award no. DMR-2338060 (D.A.B.). This research was funded in whole or in part by the Austrian Science Fund (FWF) project no. 10.55776/I6568 (A.V.C.) and Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—TRR 173—268565370 Spin+X (Projects B01 and B04) (A.A.S.).
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