Magnon-andreev-superconducting Qubit System Demonstrates Three-Body Interactions and Synchronized Collapse-Revival Phenomena
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The pursuit of interactions beyond simple pairings represents a significant frontier in quantum physics, yet creating strong connections between distinct quantum systems proves remarkably difficult. Sheng Zhao and Peng-Bo Li, researchers at Xi’an Jiaotong University, now demonstrate a novel hybrid system, integrating a magnonic mode, an Andreev spin qubit, and a superconducting qubit, that achieves a robust three-body interaction at the single-quantum-level. Their work reveals that this interaction generates unique synchronized collapse and revival patterns in qubit populations, alongside a dynamic redistribution of quantum entanglement. Crucially, the team shows that entanglement shifts continuously between tripartite and bipartite forms, a phenomenon impossible to achieve with only two-body interactions, and highlights the potential of this approach for developing fundamentally new quantum information technologies. Novel quantum phenomena extend beyond pairwise interactions, yet their implementation, particularly among distinct quantum systems, remains challenging. Here, researchers propose a hybrid quantum architecture comprising a magnonic mode within a yttrium iron garnet sphere, an Andreev spin qubit, and a superconducting qubit, to realise strong three-body interactions at the single-quantum level. By leveraging the spin-dependent supercurrent and circuit-integration flexibility of the Andreev spin qubit, scientists engineered a strong coupling that jointly excites both qubits upon magnon annihilation, or excites magnons and superconducting qubits upon Andreev spin qubit deexcitation. Through analytical and numerical studies, the team demonstrates that this interaction allows for the creation of complex quantum states and opens avenues for exploring novel quantum information processing protocols. YIG Sphere Integrates with Spin and Superconducting Qubits This work pioneers a hybrid quantum system integrating a yttrium iron garnet sphere with a superconducting circuit containing an Andreev spin qubit and a conventional superconducting qubit. Researchers engineered this setup to explore and harness strong three-body interactions at the single quantum level, a feat previously unachieved in studies focused primarily on pairwise couplings. The Andreev spin qubit, implemented using a quantum dot junction, leverages spin-orbit coupling and a Zeeman energy to encode quantum information. Scientists designed the system to facilitate a unique interplay between a bosonic magnon mode within the YIG sphere and the two solid-state qubits. The Andreev spin qubit’s inherent spin-supercurrent coupling allows it to readily interact with the superconducting qubit, while the magnetic flux induced by the YIG sphere mediates a coupling between the magnon and both qubits. Through analytical derivations and numerical simulations, the team demonstrated that this configuration enables joint excitation of magnons and superconducting qubits upon Andreev spin qubit deexcitation, or conversely, excites both solid-state qubits upon magnon annihilation. The study reveals that preparing the magnon in a coherent state induces synchronized collapse and revival oscillations in the qubit populations. Notably, during the collapse region, where populations remain stationary, the entanglement dynamically redistributes, transitioning between tripartite entanglement and bipartite entanglement between the two qubits while conserving total entanglement. This dynamic redistribution, impossible to achieve with two-body interactions, underscores the potential of three-body interactions for revealing genuinely novel quantum effects and advancing hybrid quantum information platforms. Magnon-Qubit Coupling Enables Quantum Control This research investigates the potential for creating and manipulating quantum information using a hybrid system consisting of magnons, which are quantum excitations of spin waves in magnetic materials, and superconducting qubits. The central idea is to leverage the strong coupling between these two systems to achieve coherent quantum control, entanglement, and potentially build more complex quantum devices. The research explores the dynamics of this interaction, the evolution of entanglement, and how it compares to other quantum systems.
The team observed characteristic collapse and revival of quantum states due to the interaction between magnons and qubits, and demonstrated the ability to redistribute entanglement from residual entanglement to bipartite entanglement between qubits and magnons.
Entanglement Redistribution Via Hybrid Quantum System This research demonstrates a novel hybrid quantum system, comprising a magnonic mode, an Andreev spin qubit, and a superconducting qubit, engineered to exhibit strong three-body interactions. Scientists successfully implemented a scheme leveraging the spin-supercurrent coupling of the Andreev spin qubit to achieve this interaction, allowing for the simultaneous excitation of both qubits via a single magnon. Through analytical and numerical studies, the team observed synchronized collapse and revival in qubit populations when the magnon was prepared in a coherent state. Notably, during the collapse phase, where qubit populations remain stable, researchers discovered a continuous reorganization of entanglement. The system dynamically redistributes entanglement from a genuine tripartite form to bipartite entanglement between the two qubits, and back again, while maintaining total entanglement conservation. This finding represents a significant advancement, as such entanglement redistribution is unattainable with conventional two-body couplings. This achievement provides a new platform for realizing strong three-body interactions and represents a crucial step towards advanced hybrid quantum technologies. 👉 More information 🗞 Three-body interaction in a magnon-Andreev-superconducting qubit system: collapse-revival phenomena and entanglement redistribution 🧠 ArXiv: https://arxiv.org/abs/2512.09697 Tags: