Ultra-long-living magnons in the quantum limit

• URL: http://arxiv.org/abs/2505.22773v1
• Date: Wed, 28 May 2025 18:43:02 GMT
• Title: Ultra-long-living magnons in the quantum limit
• Authors: 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, Dmytro A. Bozhko,
• Abstract summary: We report on the observation of short-wavelength magnons with lifetimes exceeding 18mus at millikelvin temperatures.<n>Our results open doors for using magnons as data carriers in modern solid-state quantum computing platforms.
• Score: 31.874825130479174
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Coherence time is the property of a quantum system that determines how long a state can hold quantum information. This parameter is directly bound to their lifetime in solid-state systems, where quantum information could be stored in quasiparticles. For decades, quasiparticles associated with magnetization order disturbance - magnons, had reported lifetimes below one microsecond at gigahertz frequencies, restricting their use as a quantum information carrier. Here, we report on the observation of short-wavelength magnons with lifetimes exceeding 18{\mu}s at millikelvin temperatures. The experiment has been performed in an ultra-pure single-crystal Yttrium Iron Garnet sphere in a wide range of temperatures from ambient down to 30 mK. Our results open doors for using magnons as data carriers in modern solid-state quantum computing platforms.

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