Preparing two-mode magnonic Schrödinger cat states in a cavity-magnon-qubit system

• URL: http://arxiv.org/abs/2606.25511v1
• Date: Wed, 24 Jun 2026 07:45:46 GMT
• Title: Preparing two-mode magnonic Schrödinger cat states in a cavity-magnon-qubit system
• Abstract summary: cavity-magnon-qubit system has recently been demonstrated as a new platform for preparing macroscopic quantum states in magnonic systems.<n>We propose to prepare a two-mode magnonic cat state, which is also a non-Gaussian entangled state.
• Score: 9.445158716437776
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The cavity-magnon-qubit system has recently been demonstrated as a new platform for preparing macroscopic quantum states in magnonic systems. Here, we propose to prepare a two-mode magnonic cat state, which is also a non-Gaussian entangled state, based on this practical system involving two yttrium-iron-garnet (YIG) spheres and a superconducting qubit coupled to a common microwave cavity. By adiabatically eliminating the cavity and resonantly driving the qubit, an effective magnon-qubit conditional-displacement interaction is achieved. Further working in the magnon-magnon strong-coupling regime and considering two identical magnon frequencies and coupling strengths to the cavity, two hybridized magnon modes are formed, of which the bright mode is prepared in a cat state after a projective measurement on the qubit, while the dark mode remains in its initial vacuum state. Such a state corresponds to a two-mode cat state of two original magnon modes, which share strong non-Gaussian entanglement. We also discuss practical dissipation and dephasing effects on the cat state. The results indicate that strong nonclassicality and non-Gaussian entanglement are present in the two-mode cat state using fully feasible parameters.

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