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Quantum Information Processing

Nonreciprocal entanglement and asymmetric steering via magnon Kerr effect in cavity optomagnonic system

Shuqi Hu, Jiajun Liu, Guangling Cheng, Jian-Song Zhang, Aixi Chen

Published Jan 25, 2025• 4 citations
Publisher
DOI
10.1007/s11128-025-04658-0

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Laser Physics Letters•Nov 26, 2024•0 citations
Optical-microwave quantum correlations are pivotal for hybrid quantum network construction. Here, we propose a scheme to achieve nonreciprocal optical-microwave steering via Bogoliubov cooling in a cavity optomagnonic system, where optical and microwave modes couple to magnons in a YIG sphere through optomagnonic and magnetic dipole interactions, respectively. By selectively applying bias magnetic fields to the YIG sphere in different directions, Kerr nonlinearity induces nonreciprocal Bogoliubov cooling effects, thereby engendering highly nonreciprocal steering. Our study presents a novel avenue for achieving nonreciprocal steering between optical and microwave fields, with potential applications in chiral quantum networking.
Abstract We propose to utilize magnon Kerr nonlinearity to generate and control microwave–microwave Einstein–Podolsky–Rosen (EPR) steering in a cavity magnonic system consisting of two microwave cavities and an yttrium iron garnet (YIG) sphere, where the magnon mode in the YIG sphere is driven by an electromagnetic field. The results show that Kerr nonlinearity of the magnon could not only sensibly induce enhanced entanglement of two microwave fields but also produce asymmetric EPR steering with different ratios of two damping rates and coupling constants. Moreover, it is found that the nonreciprocity of the steady-state EPR steering is obtainable by controlling the sign of the magnon Kerr parameter, which could be tuned from positive to negative by changing the direction of the static magnetic field. The demonstrated nonreciprocal EPR steering is of fundamental interest for the manipulation of quantum states, and may provide potential applications in quantum information tasks.