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Implementation and characterization of a novel type of superconducting qubit: the ferrotransmon
Progress in material science and nanofabrication gives opportunities to create unique hybrid Josephson junctions (JJs) and novel designs of superconducting circuits, thus providing advanced functionalities in superconducting quantum technologies and promoting alternative layouts for superconducting quantum computing devices. We will report on special properties of hybrid tunnel-ferromagnetic JJs [1-3], comprising both an insulating barrier and a ferromagnetic material. The capability to have low dissipative and high-quality tunnel ferromagnetic JJs [1-2, 4-5], also employing Al-based technology [6-8], have promoted the notion of a novel type of superconducting qubit: the ferrotransmon [9]. This type of device allows for an innovative protocol for the tuning of the qubit frequency by means of magnetic field pulses, which is not susceptible to specific noise sources in a transmon configuration.
Moreover, this kind of architecture offers novel experimental tools to probe the rich phenomenology of superconductor/ferromagnet interfaces [5] and to develop a set of quantum hardware components, ranging from amplifiers to couplers in a superconducting quantum processor. Here we report on the first characterization of ferrotransmon qubits, with coherence times comparable with non-magnetic transmons, and discuss future materials and layout optimization.
References
1. D. Massarotti et al. Nat. Commun. 6, 7376 (2015).
2. H. G. Ahmad et al., Phys. Rev. Applied 13, 014017 (2020).
3. H. G. Ahmad et al. Comms. Phys. 5, 2 (2022).
4. R. Satariano et al. Phys. Rev. B 103, 224521 (2021).
5. R. Satariano et al. Communications Materials 5, 67 (2024).
6. A. Vettoliere et al. Appl. Phys. Letter. 120, 262601 (2022).
7. H. G. Ahmad et al., Appl. Phys. Letter. 124, 232601 (2024).
8. R. Satariano et al. Appl. Phys. Lett. 127, 252601 (2025)
9. H. G. Ahmad et al., Phys. Rev. B 105, 214522 (2022).
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