Magnon antibunching in a nanomagnet

Abstract

We investigate the correlations of magnons inside a nanomagnet and identify a regime of parameters where the magnons become antibunched, i.e., where there is a large probability for occupation of the single-magnon state. This antibunched state is very different from magnons at thermal equilibrium and microwave-driven coherent magnons. We further obtain the steady state analytically and describe the magnon dynamics numerically, and ascertain the stability of such antibunched magnons over a large window of magnetic anisotropy, damping and temperature. This means that the antibunched magnon state is feasible in a wide class of low-damping magnetic nanoparticles. To detect this quantum effect, we propose to transfer the quantum information of magnons to photons by magnon-photon coupling and then measure the correlations of photons to retrieve the magnon correlations. Our findings may provide a promising platform to study quantum-classical transitions and for designing a single magnon source.

6 pages, 3 figures

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• Theory of spin Hall magnetoresistance
• Theory of magnon-driven spin Seebeck effect
• Exchange Magnon-Polaritons in Microwave Cavities
• Magnon Blockade in a Hybrid Ferromagnet-Superconductor Quantum System
• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Resources of nonlinear cavity magnonics for quantum information

Cited by in corpus (2)

• Magnon-squeezing as a niche of quantum magnonics
• Topological magnon-photon interaction for cavity magnonics