NbN-based ferromagnetic π-junctions and their application to quantum circuits

Taro Yamashita

doi:10.1117/12.2596874

1 August 2021 NbN-based ferromagnetic π-junctions and their application to quantum circuits

Taro Yamashita

Proceedings Volume 11805, Spintronics XIV; 118050A (2021) https://doi.org/10.1117/12.2596874
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

In recent years, various novel phenomena such as π-state (π-junction) and long-ranged supercurrents emerged in ferromagnetic Josephson junctions (superconductor/ferromagnet/superconductor junctions) have been studied so actively. An attractive device application of the ferromagnetic π-junction is a flux-bias-free superconducting flux quantum bit (qubit). By inserting the π-junction in the superconducting loop of the flux qubit, an external flux bias corresponding to half flux quantum, which is required for the operation of the conventional flux qubits, becomes unnecessary. This flux-bias-free feature is a great advantage in the realization of large-scale quantum circuits with many qubits. In the talk, we will present recent progress on the development of NbN-based ferromagnetic Josephson junctions which is suitable for the quantum circuits. We also show the experimental results on the several types of the quantum circuits with the NbN-based ferromagnetic π-junction.

Conference Presentation

Citation Download Citation

Taro Yamashita "NbN-based ferromagnetic π-junctions and their application to quantum circuits", Proc. SPIE 11805, Spintronics XIV, 118050A (1 August 2021); https://doi.org/10.1117/12.2596874

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