We propose to exploit currently available tunnel ferromagnetic Josephson junctions to realize a hybrid superconducting qubit. We show that the characteristic hysteretic behavior of the ferromagnetic barrier provides an alternative and intrinsically digital tuning of the qubit frequency by means of magnetic field pulses. To illustrate functionalities and limitation of the device, we discuss the coupling to a readout resonator and the effect of magnetic fluctuations. The possibility to use the qubit as a noise detector and its relevance to investigate the subtle interplay of magnetism and superconductivity is envisaged.

中文翻译：

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混合铁磁传输量子比特：磁波动的电路设计、可行性和检测协议

我们建议利用目前可用的隧道铁磁约瑟夫森结来实现混合超导量子比特。我们表明，铁磁势垒的特征滞后行为通过磁场脉冲提供了量子比特频率的替代和固有数字调谐。为了说明设备的功能和限制，我们讨论了与读出谐振器的耦合以及磁波动的影响。设想使用量子比特作为噪声检测器的可能性及其与研究磁性和超导性的微妙相互作用的相关性。