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

Abstract:We propose a scheme for generating and controlling remote nonreciprocal magnon--magnon entanglement in a cavity magnonic system with coherent this http URL 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 this http URL results provide a controllable approach to preparing remote nonreciprocal quantum correlations in cavity magnonic systems.

arXiv:2610.11607 [quant-ph]

(or arXiv:2610.11607v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.11607 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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