Anomalous Long-Distance Coherence in Critically-Driven Cavity Magnonics

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.

7 pages, 4 figures

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• Dynamic Control of Coupling Regimes in Oscillator Systems via Tunable Open Channels
• Theory and Experiment of Chirality-induced Magnetic Nonreciprocity Manifested by Coupling Phase
• Universal quantum control over non-Hermitian continuous-variable systems
• Macroscopic entanglement between localized domain walls inside a cavity
• Realizing on-demand all-to-all selective interactions between distant spin ensembles
• Remote magnon-phonon entanglement in the waveguide-magnomechanics