A feasible path for the use of ferromagnetic josephson junctions in quantum circuits: The ferro-transmon

Massarotti, D.; Ahmad, H. G.; Satariano, R.; Ferraiuolo, R.; Di Palma, L.; Mastrovito, P.; Serpico, G.; Levochkina, A.; Caruso, R.; Miano, A.; Arzeo, M.; Ausanio, G.; Granata, C.; Lucignano, P.; Montemurro, D.; Parlato, L.; Vettoliere, A.; Fazio, R.; Mukhanov, O.; Pepe, G. P.; Tafuri, F.

doi:10.1063/10.0019690

A feasible path for the use of ferromagnetic josephson junctions in quantum circuits: The ferro-transmon

Journal Article · Sat Jul 01 00:00:00 EDT 2023 · Low Temperature Physics

DOI:https://doi.org/10.1063/10.0019690· OSTI ID:2004986

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University of Naples Federico II (Italy); National Research Council (CNR), Naples (Italy). Institute for Superconductors, Innovative Materials and Devices (CNR-SPIN)
University of Naples Federico II (Italy)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
University of Naples Federico II (Italy); Yale University, New Haven, CT (United States)
SEEQC-EU, Naples (Italy)
Consiglio Nazionale delle Ricerche (CNR), Pozzuoli (Italy)
Seeqc, Inc., Elmsford, NY (United States)

We discuss the capabilities of ferromagnetic (F) Josephson junctions (JJs) in a variety of layouts and configurations. The main goal is to demonstrate the potential of these hybrid JJs to disclose new physics and the possibility to integrate them in superconducting classical and quantum electronics for various applications. The feasible path towards the use of ferromagnetic Josephson junctions in quantum circuits starts from experiments demonstrating macroscopic quantum tunneling in NbN/GdN/NbN junctions with ferro-insulator barriers and with triplet components of the supercurrent, supported by a self-consistent electrodynamic characterization as a function of the barrier thickness. This has inspired further studies on tunnel ferromagnetic junctions with a different layout and promoted the first generation of ferromagnetic Al-based JJs, specifically Al/AlO_x/Al/Py/Al. This layout takes advantage of the capability to integrate the ferromagnetic layer in the junction without affecting the quality of the superconducting electrodes and of the tunnel barrier. The high quality of the devices paves the way for the possible implementation of Al tunnel-ferromagnetic JJs in superconducting quantum circuits. These achievements have promoted the notion of a novel type of qubit incorporating ferromagnetic JJs. This qubit is based on a transmon design featuring a tunnel JJ in parallel with a ferromagnetic JJ inside a SQUID loop capacitively coupled to a superconducting readout resonator. In conclusion, the effect of an external RF field on the magnetic switching processes of ferromagnetic JJs has been also investigated.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2004986

Report Number(s):: BNL--224806-2023-JAAM

Journal Information:: Low Temperature Physics, Journal Name: Low Temperature Physics Journal Issue: 7 Vol. 49; ISSN 1063-777X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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