Generation of magnonic squeezed state and its superposition in a hybrid qubit-magnon system
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917410255142912 |
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| author | Liu, Gang Liu, Junpeng Qiao, Feng Yang, Rong-Can |
| author_facet | Liu, Gang Liu, Junpeng Qiao, Feng Yang, Rong-Can |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02924 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Generation of magnonic squeezed state and its superposition in a hybrid qubit-magnon system Liu, Gang Liu, Junpeng Qiao, Feng Yang, Rong-Can Quantum Physics 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. |
| title | Generation of magnonic squeezed state and its superposition in a hybrid qubit-magnon system |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2604.02924 |