Sarra Bira

Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

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Thomas Proslier

CEA Paris-Saclay

David Longuevergne

Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

Michael Walls

Laboratoire de physique des Solides

Jean‐Luc Maurice

École Polytechnique

F. Miserque

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Yasmine Kalboussi

Hôpital Saint-Antoine

S. Jublot-Leclerc

Université Paris-Saclay

Luc Maurice

Institut de Recherche sur les Lois Fondamentales de l'Univers

A. Gentils

Institut National de Physique Nucléaire et de Physique des Particules

Kassiogé Dembélé

Fritz Haber Institute of the Max Planck Society

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Université Paris-Saclay

Centre National de la Recherche Scientifique

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

CEA Paris-Saclay

Université Paris-Sud

Institut de Recherche sur les Lois Fondamentales de l'Univers

Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

Institut National de Physique Nucléaire et de Physique des Particules

Laboratoire de physique des Solides

Thomas Jefferson National Accelerator Facility

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Reducing two-level systems dissipations in 3D superconducting niobium resonators by atomic layer deposition and high temperature heat treatment

Applied Physics Letters (2024)

Y. Kalboussi Baptiste Delatte Sarra Bira Kassiogé Dembélé Xiaoyan Li

Superconducting qubits have arisen as a leading technology platform for quantum computing, which is on the verge of revolutionizing the world's calculation capacities. Nonetheless, the fabrication of computationally reliable qubit circuits requires increasing the quantum coherence lifetimes, which are predominantly limited by the dissipations of two-level system defects present in the thin superconducting film and the adjacent dielectric regions. In this paper, we demonstrate the reduction of two-level system losses in three-dimensional superconducting radio frequency niobium resonators by atomic layer deposition of a 10 nm aluminum oxide Al2O3 thin films, followed by a high vacuum heat treatment at 650 °C for few hours. By probing the effect of several heat treatments on Al2O3-coated niobium samples by x-ray photoelectron spectroscopy plus scanning and conventional high resolution transmission electron microscopy coupled with electron energy loss spectroscopy and energy dispersive spectroscopy, we witness a dissolution of niobium native oxides and the modification of the Al2O3-Nb interface, which correlates with the enhancement of the quality factor at low fields of two 1.3 GHz niobium cavities coated with 10 nm of Al2O3.

10.1063/5.0202214

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Design of a Quadrupole Resonator for the characterization of the superconducting properties of thin films in radiofrequency regime

HAL (Le Centre pour la Communication Scientifique Directe) (2021)

Sarra Bira

Characterization

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Multipacting Analysis of the Quadripolar Resonator (QPR) at HZB

HAL (Le Centre pour la Communication Scientifique Directe) (2021)

Sarra Bira Yasmine Kalboussi Sebastian Keckert Jens Knobloch Oliver Kugeler

10.18429/jacow-srf2021-supcav013

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Geometry Optimization for a Quadrupole Resonator at Jefferson Lab

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2023)

Sarra Bira Mingqiao Ge A-M. Valente-Feliciano Lorena Vega Cid W. Venturini Delsolaro

10.18429/jacow-srf2023-wepwb048

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Reducing two-level system dissipations in 3D superconducting Niobium resonators by atomic layer deposition and high temperature heat treatment

arXiv (Cornell University) (2024)

Yasmine Kalboussi Baptiste Delatte Sarra Bira Kassiogé Dembélé Xiaoyan Li

Superconducting qubits have arisen as a leading technology platform for quantum computing which is on the verge of revolutionizing the world's calculation capacities. Nonetheless, the fabrication of computationally reliable qubit circuits requires increasing the quantum coherence lifetimes, which are predominantly limited by the dissipations of two-level system (TLS) defects present in the thin superconducting film and the adjacent dielectric regions. In this paper, we demonstrate the reduction of two-level system losses in three-dimensional superconducting radio frequency (SRF) niobium resonators by atomic layer deposition (ALD) of a 10 nm aluminum oxide Al2O3 thin films followed by a high vacuum (HV) heat treatment at 650 {\deg}C for few hours. By probing the effect of several heat treatments on Al2O3-coated niobium samples by X-ray photoelectron spectroscopy (XPS) plus scanning and conventional high resolution transmission electron microscopy (STEM/HRTEM) coupled with electron energy loss spectroscopy (EELS) and (EDX) , we witness a dissolution of niobium native oxides and the modification of the Al2O3-Nb interface, which correlates with the enhancement of the quality factor at low fields of two 1.3 GHz niobium cavities coated with 10 nm of Al2O3.

10.48550/arxiv.2402.04137

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