Abstract
We show how a quantum state in a microwave cavity mode can be transferred to and stored in a phononic mode via an intermediate magnon mode in a magnomechanical system. For this we consider a ferrimagnetic yttrium iron garnet (YIG) sphere inserted in a microwave cavity, where the microwave and magnon modes are coupled via a magnetic-dipole interaction and the magnon and phonon modes in the YIG sphere are coupled via magnetostrictive forces. By modulating the cavity and magnon detunings and the driving of the magnon mode in time, a stimulated Raman adiabatic passage-like coherent transfer becomes possible between the cavity mode and the phonon mode. The phononic mode can be used to store the photonic quantum state for long periods as it possesses lower damping than the photonic and magnon modes. Thus our proposed scheme offers a possibility of using magnomechanical systems as quantum memory for photonic quantum information.
Highlights
The coupling between magnons in a ferrimagnetic material and phonons in a mechanical resonator has attracted wide attention in recent years due to its application in magnomechanical settings similar to cavity quantum electrodynamics and optomechanics
A mechanical resonator can be coupled to an optical cavity mode via radiation pressure interaction [1, 2], as well as to a microwave cavity mode via an electrostatic interaction [3, 4]
Magnons can in turn be strongly coupled to microwave cavity modes as well, in the insulating magnetic material yttrium iron garnet (YIG)
Summary
The coupling between magnons in a ferrimagnetic material and phonons in a mechanical resonator has attracted wide attention in recent years due to its application in magnomechanical settings similar to cavity quantum electrodynamics and optomechanics. Combining the magnetostrictive coupling between magnons and phonons and the magnon-cavity coupling, a new kind of photon-magnon-phonon interaction can be realized with YIG spheres interacting with microwave cavities This opens up new possibilities in quantum state engineering and control. The quanta can be stored in the mechanical resonator for some time and can be extracted using a retrieval pulse In this way quantum states can be stored for times longer than the cavity lifetime, due to the lower damping rate of the phononic mode. We will show that, using these time-dependent modulations, a STIRAPlike protocol can be designed to effectively transfer the microwave cavity state to the mechanical mode and retrieve it back to the microwave cavity mode
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