Preparing magnonic non-Gaussian states by adding a single magnon onto Gaussian states

• URL: http://arxiv.org/abs/2503.11052v1
• Date: Fri, 14 Mar 2025 03:44:22 GMT
• Title: Preparing magnonic non-Gaussian states by adding a single magnon onto Gaussian states
• Authors: Zi-Xu Lu, Huai-Bing Zhu, Xuan Zuo, Jie Li,
• Abstract summary: We prepare two kinds of non-Gaussian magnonic states by adding a single magnon onto two Gaussian states.<n>Both states show a smooth transition from a quantum state to a classical state by changing the coherent or thermal magnon excitations.
• Score: 4.561414434532408
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum magnonics based on YIG spheres provides a new arena for observing macroscopic quantum states. Here we propose to prepare two kinds of non-Gaussian magnonic states by adding a single magnon onto two Gaussian states, namely, coherent and thermal states. We adopt an optomagnonic system of a YIG sphere and use fast optical pulses to weakly activate the magnon-induced Stokes scattering. Conditioned on the detection of a polarized single photon, a single magnon can be added onto an initial Gaussian state. We use a microwave cavity to prepare an initial magnon coherent state and finally read out the generated single-magnon added coherent or thermal state. Both the non-Gaussian states of a magnon mode in a large-size YIG sphere are macroscopic quantum states, which exhibit many nonclassical properties, such as sub-Poissonian statistics, quadrature squeezing, and a negative Wigner function. Further, both states show a smooth transition from a quantum state to a classical state by changing the coherent or thermal magnon excitations and thus can be used for the fundamental study of the quantum-to-classical transition.

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