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This research proposes a novel class of superconducting qubits leveraging altermagnet-based Josephson junctions to achieve enhanced coherence and noise protection through parity mechanisms. By engineering specific current-phase relations, the architecture offers intrinsic robustness against charge and flux noise while maintaining large anharmonicity for high-performance quantum operations. This work establishes altermagnets as a viable platform for advancing scalable superconducting quantum computing hardware.
Superconducting qubit based on altermagnets
arXiv:2609.24759v1 Announce Type: new Abstract: Altermagnets, characterized by vanishing net magnetization and momentum-dependent spin splitting, provide a promising platform for next-generation Josephson devices. Here, we exploit the Josephson effect in superconductor-altermagnet-superconductor junctions and show how to engineer prescribed current-phase relations by device design. Based on these programmable Josephson potentials utilizing altermagnetism, we propose a new class of transmon-like superconducting qubits that combine large anharmonicity with enhanced robustness against decoherence via coherent two-Cooper-pair tunneling. We show that in the $2\phi$-junction regime, this kind of qubit provides intrinsic protection against charge noise due to parity protection. Magnetic flux can be used to precisely control the qubit and, under appropriate bias, this architecture further suppresses charge and flux noise. Our results establish altermagnets as a versatile platform for Josephson-potential engineering and open a new route toward high-performance superconducting qubits combining high coherence, large anharmonicity, and broad tunability.
Abstract:Altermagnets, characterized by vanishing net magnetization and momentum-dependent spin splitting, provide a promising platform for next-generation Josephson devices. Here, we exploit the Josephson effect in superconductor-altermagnet-superconductor junctions and show how to engineer prescribed current-phase relations by device design. Based on these programmable Josephson potentials utilizing altermagnetism, we propose a new class of transmon-like superconducting qubits that combine large anharmonicity with enhanced robustness against decoherence via coherent two-Cooper-pair tunneling. We show that in the $2\phi$-junction regime, this kind of qubit provides intrinsic protection against charge noise due to parity protection. Magnetic flux can be used to precisely control the qubit and, under appropriate bias, this architecture further suppresses charge and flux noise. Our results establish altermagnets as a versatile platform for Josephson-potential engineering and open a new route toward high-performance superconducting qubits combining high coherence, large anharmonicity, and broad tunability.
Quantum Physics (quant-ph); Superconductivity (cond-mat.supr-con)
arXiv:2609.24759 [quant-ph]
(or arXiv:2609.24759v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2609.24759 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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