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  • Open Access

Remote magnon-magnon entanglement enhanced by squeezed-field interference

Yuan Gong1, Yan-Xue Cheng1, Wei Xiong1,2,*, and Jiaojiao Chen1,†

  • 1Department of Physics, Wenzhou University, Zhejiang 325035, China
  • 2International Quantum Academy, Shenzhen 518048, China

  • *Contact author: xiongweiphys@wzu.edu.cn
  • †Contact author: jjchenphys@wzu.edu.cn
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APS Open Sci. 1, 000027 – Published 26 May, 2026

DOI: https://doi.org/10.1103/m3z7-z9t4

Abstract

Cavity magnonics, owing to its strong magnon-photon coupling and excellent tunability, has attracted significant interest in quantum information science. However, achieving strong and robust macroscopic entanglement remains a long-standing challenge due to the inherently linear nature of the beam-splitter interaction. Here, we propose an experimentally feasible scheme to generate and enhance macroscopic entanglement between two remote magnon modes by injecting squeezed vacuum fields (SVFs) into coupled microwave cavities. We demonstrate that even a single SVF applied to one cavity can induce steady magnon-magnon entanglement, while applying two SVFs (the double-squeezed configuration) enables selective activation of two independent entanglement channels associated with the cavity supermodes. Remarkably, quantum interference between the two SVFs allows for phase-controlled enhancement of entanglement, resulting in significantly improved robustness against cavity dissipation and thermal noise. Under realistic parameters, the survival temperature of quantum entanglement increases from approximately 260 to 450 mK. Our results establish a versatile and controllable approach to generating and enhancing quantum entanglement through quantum interference between squeezed vacuum fields.

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APS Open Sci. 1, 000027– Published 26 May, 2026
Vol. 1
  • Received 18 November 2025
  • Accepted 13 May 2026
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