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Figure 1 | EPJ Quantum Technology

Figure 1

From: Parametric controllable one-way quantum steering induced by four-wave mixing in cavity magnonics

Figure 1

(a) Schematic diagram of cavity magnonics system. Two YIG spheres are placed in a microwave cavity with frequency \(\omega _{a}\) and linewidth \(\kappa _{a}\) which is driven by a two-photon driving field with frequency \(2\omega _{l}\), the magnon mode \(m_{1(2)}\) with frequency \(\omega _{1(2)}\) is modulated by a bias magnetic field \(H_{1(2)}\) along the z direction, and the magnetic field of the cavity is along the y direction. (b) Spectrum diagram of four-wave mixing. The four-wave mixing occurs when the frequencies of cavity and the magnon modes satisfy the matching condition \(\omega _{a} + \omega _{1(2)} = 2\omega _{l}\), i.e., \(\Delta _{a} = -\Delta _{1(2)}\), where the energy of driving photon pair is absorbed, and the cavity mode and the magnon mode are simultaneously excited

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