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arXiv · 2604.02924

Generation of magnonic squeezed state and its superposition in a hybrid qubit-magnon system

Gang Liu·Junpeng Liu·Feng Qiao·Rong-Can Yang
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Abstract

We propose a protocol for generating magnonic squeezed states (MSS) and their superpositions (SMSS) in a hybrid system comprising a superconducting flux qubit magnetically coupled to the Kittel mode of a yttrium iron garnet (YIG) sphere. The flux qubit provides an intrinsic longitudinal interaction with the magnon mode, which, under resonant microwave driving, gives rise to an effective qubit-state-dependent squeezing Hamiltonian. Numerical simulations incorporating realistic dissipation demonstrate that magnon quadrature noise reduction exceeding $8~\mathrm{dB}$ is achievable with experimentally accessible parameters.~By preparing the qubit in a superposition state followed by projective measurement, we further obtain symmetric and antisymmetric superpositions of orthogonally squeezed magnon states exhibiting clear phase-space interference fringes.~We discuss how the fourfold rotational symmetry of these states supports a bosonic logical encoding with potential for protecting against dominant error channels in magnonic platforms.

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Gang Liu, Junpeng Liu, Feng Qiao, Rong-Can Yang. 2026-04-03. Generation of magnonic squeezed state and its superposition in a hybrid qubit-magnon system. https://arxiv.org/abs/2604.02924

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