Competition of Quasiparticles and Magnetization Noise in Hybrid Ferromagnetic Transmon Qubits

Ahmad, Halima Giovanna; Brosco, Valentina; Miano, Alessandro; Palma, Luigi Di; Arzeo, Marco; Satariano, Roberta; Ferraiuolo, Raffaella; Lucignano, P.; Vettoliere, A.; Granata, C.; Parlato, L.; Ausanio, G.; Montemurro, Domenico; Pepe, Giovanni Piero; Fazio, Rosario; Tafuri, F.; Massarotti, Davide

doi:10.1109/tasc.2023.3243197

IEEE Trans. Appl. Supercond.

2023

DOI: 10.1109/tasc.2023.3243197

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Competition of Quasiparticles and Magnetization Noise in Hybrid Ferromagnetic Transmon Qubits

Halima Giovanna Ahmad¹,

Valentina Brosco

Alessandro Miano

et al.

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Cited by 4 publications

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“…Further recent work in this direction concerns the integration of ferromagnetic junctions in superconducting circuits. 53,59 The possibility to experimentally realize the device proposed in the present work critically depends on the ability to fabricate high-quality twisted interfaces and to integrate them in quantum superconducting nanocircuits. A first advancement in this direction is discussed in Refs.…”

mentioning

confidence: 99%

Flux-tunable regimes and supersymmetry in twisted cuprate heterostructures

Coppo,

Chirolli,

Poccia

et al. 2024

Applied Physics Letters

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Van der Waals assembly allows for the creation of Josephson junctions in an atomically sharp interface between two exfoliated Bi2Sr2CaCu2O8+δ (Bi-2212) flakes that are twisted relative to each other. In a narrow range of angles close to 45°, the junction exhibits a regime where time-reversal symmetry can be spontaneously broken, and it can be used to encode an inherently protected qubit called flowermon. In this work, we investigate the physics emerging when two such junctions are integrated in a superconducting quantum interference device circuit threaded by a magnetic flux. We show that the flowermon qubit regime is maintained up to a finite critical value of the magnetic field, and, under appropriate conditions, it is protected against both charge and flux noise. For larger external fluxes, the interplay between the inherent twisted d-wave nature of the order parameter and the external magnetic flux enables the implementation of different artificial atoms, including a flux-biased protected qubit and a supersymmetric quantum circuit.

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mentioning

confidence: 99%

Flux-tunable regimes and supersymmetry in twisted cuprate heterostructures

Coppo,

Chirolli,

Poccia

et al. 2024

Applied Physics Letters

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Evidence of the inverse proximity effect in tunnel magnetic josephson junctions

Satariano,

Volkov,

Ahmad

et al. 2024

Low Temperature Physics

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Magnetic Josephson junctions (MJJs) are a special class of hybrid systems where antagonistic correlations coexist, thus providing a key for advances in weak superconductivity, superconducting spintronics, and quantum computation. So far, the memory properties of MJJs have been mostly investigated in view of digital electronics and for spintronic devices at liquid-helium temperature. At the operating temperature of quantum circuits, a magnetic order can rise in a superconductor (S) at the S/ferromagnet (F) interface, i.e., the inverse proximity effect (IPE), thus leading to a significant modification of the magnetic field patterns in MJJs. In this work, we have carried out a comparative investigation of the magnetic behavior of tunnel MJJs with a strong ferromagnetic layer inserted in the layout of both Nb and Al JJs, respectively. The comparative analysis validates the crucial role of the temperature, the fundamental scaling energies of S/F coupling systems, and the transparency of the S/F interface. This investigation points out that the IPE is a key aspect to consider when designing tunnel MJJs operating well below 4 K and thus in the perspective of hybrid superconducting quantum architectures.

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Phase dynamics of tunnel Al-based ferromagnetic Josephson junctions

Ahmad,

Satariano,

Ferraiuolo

et al. 2024

Applied Physics Letters

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By measuring the current–voltage characteristics and the switching current distributions as a function of temperature, we have investigated the phase dynamics of Al tunnel ferromagnetic Josephson junctions (JJs), designed to fall in the typical range of parameters of state-of-the-art transmons, providing evidence of phase diffusion processes. The comparison with the experimental outcomes on non-magnetic JJs with nominally the same electrodynamical parameters demonstrates that the introduction of ferromagnetic barriers does not cause any sizeable detrimental effect and supports the notion of including tunnel ferromagnetic JJs in qubit architectures.

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Competition of Quasiparticles and Magnetization Noise in Hybrid Ferromagnetic Transmon Qubits

Cited by 4 publications

References 42 publications

Flux-tunable regimes and supersymmetry in twisted cuprate heterostructures

Flux-tunable regimes and supersymmetry in twisted cuprate heterostructures

Evidence of the inverse proximity effect in tunnel magnetic josephson junctions

Phase dynamics of tunnel Al-based ferromagnetic Josephson junctions

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