Anomalous Long-Distance Coherence in Critically-Driven Cavity Magnonics
- URL: http://arxiv.org/abs/2404.13190v1
- Date: Fri, 19 Apr 2024 21:34:41 GMT
- Title: Anomalous Long-Distance Coherence in Critically-Driven Cavity Magnonics
- Authors: Ying Yang, Jiguang Yao, Yang Xiao, Pak-Tik Fong, Hoi-Kwan Lau, C. -M. Hu,
- Abstract summary: We show long-distance coherence in cavity magnonics operating in the linear regime.
Non-local magnon-photon coherence is established via strong coupling over a 2-meter distance.
Our work shows the potential of using critical phenomena for harnessing long-distance coherence in distributed systems.
- Score: 4.265862203253927
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Developing quantum networks necessitates coherently connecting distant systems via remote strong coupling. Here, we demonstrate long-distance coherence in cavity magnonics operating in the linear regime. By locally setting the cavity near critical coupling with travelling photons, non-local magnon-photon coherence is established via strong coupling over a 2-meter distance. We observe two anomalies in this long-distance coherence: first, the coupling strength oscillates twice the period of conventional photon-mediated couplings; second, clear mode splitting is observed within the cavity linewidth. Both effects cannot be explained by conventional coupled-mode theory, which reveal the tip of an iceberg of photon-mediated coupling in systems under critical driving. Our work shows the potential of using critical phenomena for harnessing long-distance coherence in distributed systems.
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