Two‐Magnon Non‐Locality and Coherence Induced by an Open Microwave Cavity: Generation and Robustness

Abstract

The generation and robustness of two-magnon non-locality and coherence dynamics induced by an open microwave field cavity are investigated in this work. The studied system consists of a two-sublattice ferrimagnet coupled to a microwave field within an open cavity through its magnetic field component. The robustness of the two-magnons non-locality dynamics is analyzed using various non-locality and coherence measures (namely, uncertainty-induced non-locality [UIN], maximal Bell function, and log-negativity entanglement [L-NE]) in the presence of the spontaneous emission and the electromagnetic-wave dissipation. It is shown that photon-magnon couplings, two-magnon couplings, and dissipation all have an impact on the dynamical aspect of two-magnon non-locality and coherence. This work reveals that the two-magnon non-locality and coherence can be generated. For an initial maximal correlated two-magnon state, the initial UIN non-locality is shown to be more resilient than the maximum Bell function and log-negativity. The amplitudes of the two-magnon non-locality quantifiers decline as a result of the two-magnon coupling. The Bell non-locality and L-NE are reduced via spontaneous emission and dissipation, but the two-magnon UIN-coherence is preserved. These findings contribute to a better understanding of such dynamics and may shed light on measurement estimation in open quantum systems.