Nonreciprocal entanglement in the hybrid microwave optoelectromechanical system

We present a scheme to realize nonreciprocal entanglement within a hybrid quadpartite system, which consists of a microwave cavity, a yttrium iron garnet (YIG) sphere supporting magnons with Kerr nonlinearity, a mechanical oscillator (MO), and an LC electrical resonator. The nonreciprocity originates from the direction-dependent Kerr effect . By adjusting the direction of the bias magnetic field, the magnon frequency shift and the two-magnon effect can be induced, resulting in enhanced nonreciprocal bipartite entanglement and tunable nonreciprocity switching. Notably, ideal nonreciprocal entanglement can be achieved by optimizing the system parameters. Moreover, the results indicate that the entanglement is robust against environmental thermal noise. This approach establishes a promising platform for developing nonreciprocal quantum devices with potential applications in quantum information processing. • We explore nonreciprocal entanglement in a hybrid quadpartite system. • The nonreciprocity originates from the direction-dependent Kerr effect. • Ideal nonreciprocal entanglement can be achievable. • The bipartite entanglements can be nonreciprocally enhanced.