Remote nonreciprocal magnon magnon entanglement via the Barnett effect with coherent feedback

@misc{jia2026remote,
  title = {{Remote nonreciprocal magnon magnon entanglement via the Barnett effect with coherent feedback}},
  author = {Jinhao Jia and Yingyu Li and Ran Liang and Qinghua Cai and Xin Wen and Mei Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.11607},
  eprint = {2610.11607},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.11607},
}

TY  - UNPB
TI  - Remote nonreciprocal magnon magnon entanglement via the Barnett effect with coherent feedback
AU  - Jinhao Jia
AU  - Yingyu Li
AU  - Ran Liang
AU  - Qinghua Cai
AU  - Xin Wen
AU  - Mei Zhang
PY  - 2026
DA  - 2026/10/08
PB  - arXiv
DO  - 10.48550/arxiv.2610.11607
UR  - https://arxiv.org/abs/2610.11607
AB  - We propose a scheme for generating and controlling remote nonreciprocal magnon--magnon entanglement in a cavity magnonic system with coherent feedback.The two microwave cavities are driven by independent single-mode squeezed vacuum fields, with a rotating YIG sphere in the left cavity and a stationary one in the right cavity. For a fixed rotation direction, reversing the bias magnetic field applied to the rotating sphere changes the sign of the Barnett shift, leading to nonreciprocal magnon--magnon entanglement. By tuning the cavity detuning and feedback phase, entanglement can be generated for one direction of the bias magnetic field while it vanishes for the opposite direction, yielding complete nonreciprocity. Coherent feedback enhances the entanglement at an appropriate reflectivity, whereas stronger feedback can reduce it. The relative squeezing phase provides additional control, and an appropriate choice of unequal squeezing factors improves the entanglement at fixed total input photon occupation. With the squeezed inputs kept fixed, moderate feedback also increases the critical temperature for magnon entanglement.Our results provide a controllable approach to preparing remote nonreciprocal quantum correlations in cavity magnonic systems.
ER  -