Remote nonreciprocal magnon magnon entanglement via the Barnett effect with coherent feedback
The study proposes a method to create and control remote nonreciprocal entanglement between magnons in two separated microwave cavities using coherent feedback and squeezed vacuum inputs. By exploiting the Barnett effect, reversing the bias magnetic field direction switches this entanglement on or off, allowing for complete nonreciprocity. The scheme offers tunable parameters for precise control over these quantum correlations.