Towards novel tunability schemes for hybrid ferromagnetic transmon qubits

• URL: http://arxiv.org/abs/2412.06562v1
• Date: Mon, 09 Dec 2024 15:13:59 GMT
• Title: Towards novel tunability schemes for hybrid ferromagnetic transmon qubits
• Authors: Halima Giovanna Ahmad, Raffaella Ferraiuolo, Giuseppe Serpico, Roberta Satariano, Anna Levochkina, Antonio Vettoliere, Carmine Granata, Domenico Montemurro, Martina Esposito, Giovanni Ausanio, Loredana Parlato, Giovanni Piero Pepe, Alessandro Bruno, Francesco Tafuri, Davide Massarotti,
• Abstract summary: Superconductor-Insulating-thin superconducting interlayer-Ferromagnet-Superconductor Josephson junctions (SIsFS JJs) We propose integrating tunnel Superconductor-Insulating-thin superconducting interlayer-Ferromagnet-Superconductor Josephson junctions (SIsFS JJs) into a novel transmon qubit design, the so-called ferrotransmon. We will give a special focus on the design, simulations, and preliminary experimental characterization of superconducting lines to provide in-plane magnetic fields, fundamental for an on-chip control of the qubit frequencies in the ferrotransmon.
• Score: 29.74665874418989
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• Abstract: Flux tuning of qubit frequencies in superconducting quantum processors is fundamental for implementing single and multi-qubit gates in quantum algorithms. Typical architectures involve the use of DC or fast RF lines. However, these lines introduce significant heat dissipation and undesirable decoherence mechanisms, leading to a severe bottleneck for scalability. Among different solutions to overcome this issue, we propose integrating tunnel Superconductor-Insulating-thin superconducting interlayer-Ferromagnet-Superconductor Josephson junctions (SIsFS JJs) into a novel transmon qubit design, the so-called ferrotransmon. SIsFS JJs provide memory properties due to the presence of ferromagnetic barriers and preserve at the same time the low-dissipative behavior of tunnel-insulating JJs, thus promoting an alternative tuning of the qubit frequency. In this work, we discuss the fundamental steps towards the implementation of this hybrid ferromagnetic transmon. We will give a special focus on the design, simulations, and preliminary experimental characterization of superconducting lines to provide in-plane magnetic fields, fundamental for an on-chip control of the qubit frequencies in the ferrotransmon.

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