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.

arXiv comment6 pages, 3 figures

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• Magnon-Skyrmion Hybrid Quantum Systems: Tailoring Interactions via Magnons
• Master equation approach to magnon relaxation and dephasing
• Enhanced magnon spin current using the bosonic Klein paradox
• Pure dephasing of magnonic quantum states
• Cavity magnonics with easy-axis ferromagnet: Critically enhanced magnon squeezing and light-matter interaction
• Quantum many-body states and Green functions of nonequilibrium electron-magnon systems: Localized spin operators vs. their mapping to Holstein-Primakoff bosons
• Stabilizing a single-magnon state by optimizing magnon blockade
• Topological magnon-photon interaction for cavity magnonics
• Magnon and photon blockade in a hybrid antiferromagnet-cavity quantum system
• Second-order correlation and squeezing of photons in cavities with ultrastrong magnon-photon interactions
• Scaling Enhancement of Photon Blockade in Output Fields
• Phonon- and magnon-mediated decoherence of a magnonic qubit