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Macroscopic entanglement between two magnon modes via two-tone driving of a superconducting qubit

  • Rong-Can Yang
  • Gang Liu
  • Gen Li
  • Jie Li
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Abstract

The cavity-mediated coupling between magnons in an yttrium-iron-garnet (YIG) sphere and a superconducting qubit has recently been demonstrated as a new platform for preparing macroscopic quantum states. Here, based on this system, we propose to entangle two magnon modes in two YIG spheres by driving the qubit with a two-tone field and by appropriately choosing the frequencies and strengths of the two driving fields. We show that strong entanglement can be achieved with fully feasible parameters. We further provide a detection scheme for experimentally verifying the entanglement. Our results indicate that macroscopic entanglement between two magnon modes in two millimeter-sized YIG spheres, involving more than 1018 spins, can be realized using currently available parameters, which finds promising applications in fundamental studies, such as macroscopic quantum mechanics and the test of unconventional decoherence theories.

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Cite

BibTeXRIS
BibTeX
@misc{yang2026macroscopic,
  title = {{Macroscopic entanglement between two magnon modes via two-tone driving of a superconducting qubit}},
  author = {Rong-Can Yang and Gang Liu and Gen Li and Jie Li},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.06297},
  eprint = {2605.06297},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.06297},
}
RIS
TY  - UNPB
TI  - Macroscopic entanglement between two magnon modes via two-tone driving of a superconducting qubit
AU  - Rong-Can Yang
AU  - Gang Liu
AU  - Gen Li
AU  - Jie Li
PY  - 2026
DA  - 2026/09/25
PB  - arXiv
DO  - 10.48550/arxiv.2605.06297
UR  - https://arxiv.org/abs/2605.06297
AB  - The cavity-mediated coupling between magnons in an yttrium-iron-garnet (YIG) sphere and a superconducting qubit has recently been demonstrated as a new platform for preparing macroscopic quantum states. Here, based on this system, we propose to entangle two magnon modes in two YIG spheres by driving the qubit with a two-tone field and by appropriately choosing the frequencies and strengths of the two driving fields. We show that strong entanglement can be achieved with fully feasible parameters. We further provide a detection scheme for experimentally verifying the entanglement. Our results indicate that macroscopic entanglement between two magnon modes in two millimeter-sized YIG spheres, involving more than 10^18 spins, can be realized using currently available parameters, which finds promising applications in fundamental studies, such as macroscopic quantum mechanics and the test of unconventional decoherence theories.
ER  -