Entangling ferrimagnetic magnons with an atomic ensemble via opto-magnomechanics

Abstract

We show how to prepare macroscopic entanglement between an atomic ensemble and a large number of magnons in a ferrimagnetic YIG crystal. Specifically, we adopt an opto-magnomechanical configuration where the magnetostriction-induced magnomechanical displacement couples to an optical cavity via radiation pressure, and the latter further couples to an ensemble of two-level atoms that are placed inside the cavity. We show that by properly driving the cavity and magnon modes, optomechanical entanglement is created which is further distributed to the atomic and magnonic systems, yielding stationary entanglement between atoms and magnons. The atom-magnon entanglement is a result of the combined effect of opto- and magnomechanical cooling and optomechanical parametric down-conversion interactions. A competition mechanism between two mechanical cooling channels is revealed. We further show that genuine tripartite entanglement of three massive subsystems, i.e., atoms, magnons and phonons, can also be achieved in the same system. Our results indicate that the hybrid opto-magnomechanical system may become a promising system for preparing macroscopic quantum states involving magnons, photons, phonons and atoms.

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• Emergence and enhancement of feedback control induced quantum entanglement
• Synchronization by Magnetostriction
• Magnomechanically controlled Goos-Hänchen shift in cavity QED
• Quantum correlations enhanced in hybrid optomechanical system via phase tuning
• Microwave-optics entanglement via coupled opto- and magnomechanical microspheres
• Generation of optomicrowave and optomagnonic entanglements in cascaded optomagnomechanical systems
• Micromagnons and long-range entanglement in ferrimagnetic ground states