Superconducting Materials: Nb, Encapsulation and Loss Studies

Presentations

• Correlating the quality factor with the deposition temperature of Nb thin films used in superconducting qubits

  ORAL

  March 18, 2026, 12:00 PM – March 18, 2026, 12:12 PM

  Presenters

  • Amlan Datta

    • Ames National Laboratory, Iowa State University

  Authors

  • Amlan Datta

    • Ames National Laboratory, Iowa State University

  • Kamal R Joshi

    • Iowa State University
    • Ames National Laboratory

  • Bicky Singh Moirangthem

    • Ames National Laboratory, Iowa State University
    • Iowa State University

  • Tony McFadden

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology
    • National Institute of Standards and Technology, Boulder CO 80305
    • National Institute of Standards and Technology, Boulder, Colorado 80305, USA
    • National Institute of Standards and Technology (NIST)
    • University of California, Santa Barbara
    • National Institute of Standards and Technology, Boulder

  • Florent Lecocq

    • National Institute of Standards and Technology, University of Colorado Boulder
    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology, Boulder, Colorado 80305, USA
    • National Institute of Standards and Technology Boulder, University of Colorado Boulder

  • Ray W Simmonds

    • National Institute of Standards and Technology, University of Colorado Boulder
    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder
    • The Global Coherence Project

  • Matthew J Kramer

    • Ames National Laboratory
    • Ames Laboratory, Ames IA 50011
    • Ames Laboratory

  • Makariy A Tanatar

    • Ames National Laboratory

  • Ruslan Prozorov

    • Ames National Laboratory

  View abstract →

• Identifying Decoherence Mechanisms in Superconducting Qubits through Advanced Materials Characterization

  ORAL

  March 18, 2026, 12:12 PM – March 18, 2026, 12:24 PM

  Presenters

  • Akshay A Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  Authors

  • Akshay A Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  • Jaeyel Lee

    • Fermi National Accelerator Laboratory
    • Fermilab

  • Zuhawn Sung

    • Fermi National Accelerator Laboratory (FNAL)

  • Shaojiang Zhu

    • Fermi National Accelerator Laboratory (Fermilab)

  • Mustafa Bal

    • Fermi National Accelerator Laboratory
    • Xanadu

  • Francesco Crisa

    • Fermi National Accelerator Laboratory
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermilab

  • Sabrina Garattoni

    • Fermilab
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermi National Accelerator Laboratory

  • Alexander Romanenko

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory, Batavia, Illinois, 60510, USA

  View abstract →

• Influence of intrinsic film stress on superconducting quantum circuit performance

  ORAL

  March 18, 2026, 12:24 PM – March 18, 2026, 12:36 PM

  Presenters

  • David C Bunch

    • Walther-Meißner-Institut
    • Walther-Meissner-Institute

  Authors

  • David C Bunch

    • Walther-Meißner-Institut
    • Walther-Meissner-Institute

  • Leon Koch

    • TU Munich
    • TU Munich & Walther-Meissner-Institute
    • Walther-Meissner-Institute
    • TU Munich & Walther-Meißner-Institut
    • Walther-Meißner-Institut
    • Walther Meissner Institute & TU Munich

  • Niklas Bruckmoser

    • Walther-Meißner-Institute
    • TU Munich & Walther-Meissner-Institute
    • Walther-Meissner-Institute
    • Walther-Meißner-Institut
    • Walther Meissner Institute & TU Munich

  • Lea Richard

    • Walther Meissner Institut
    • TU Munich
    • Walther-Meissner-Institute
    • Walther-Meißner-Institut

  • Julius Feigl

    • Walther-Meissner-Insitute
    • Walther-Meissner-Institut
    • Walther-Meissner-Institute
    • TU Munich & Walther-Meißner-Institut
    • Walther-Meißner-Institut
    • Walther Meissner Institute & TU Munich

  • Vera Bader

    • Walther-Meissner-Institut
    • Walther-Meissner-Institute
    • Walther-Meißner-Institut

  • Lasse Södergren

    • Walther-Meissner-Institute
    • Walther-Meissner-Institut
    • Walther-Meißner-Institut
    • Walther Meissner Institute & TU Munich

  • Stephan Geprägs

    • Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
    • Walther-Meissner-Institut
    • Walther-Meissner-Institute

  • Stefan Filipp

    • Walther-Meißner-Institute
    • TU Munich
    • TU Munich & Walther-Meissner-Institute
    • Walther-Meissner-Institute
    • Walther-Meißner-Institut & TU Munich
    • TU Munich & Walther-Meißner-Institut
    • Walther Meissner Institute & TU Munich

  View abstract →

• Validation of CMOS-compatible fabrication of capped Niobium coplanar resonators for transmon qubit integration  

  ORAL

  March 18, 2026, 12:36 PM – March 18, 2026, 12:48 PM

  Presenters

  • Abraham F Campos Contreras

    • Univ. Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France

  Authors

  • Abraham F Campos Contreras

    • Univ. Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France

  • Michaël Bouvier

    • Univ. Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France

  • Sampo Saarinen

    • IQM Quantum Computers, Espoo 02150, Finland

  • Thomas Magis

    • Univ. Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France

  • Richard Souil

    • Univ. Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France

  • Christophe Porzier

    • Univ. Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France

  • Felix Rautschke

    • ALICE & BOB
    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • Paul Magnard

    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • Julien Roul

    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • Julien Rioux

    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • Stephane Polis

    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • William Piedot

    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • Romeck Kloezen

    • Alice & Bob
    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • Alireza Mottaghizadeh

    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • Antoine GRAS

    • Alice & Bob, 53 Bd du Général Martial Valin, 75015 Paris, France

  • Mikaël Cassé

    • Univ. Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France

  • Brice Tavel

    • Univ. Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France

  View abstract →

• Abstract Withdrawn

  ORAL · Withdrawn

  March 18, 2026, 12:48 PM – March 18, 2026, 1:00 PM

  View abstract →

• Oxygen distribution and segregation at grain boundaries in Nb and Ta-capped Nb superconducting thin films

  ORAL

  March 18, 2026, 1:00 PM – March 18, 2026, 1:12 PM

  Presenters

  • Jaeyel Lee

    • Fermi National Accelerator Laboratory
    • Fermilab

  Authors

  • Jaeyel Lee

    • Fermi National Accelerator Laboratory
    • Fermilab

  • Dieter Isheim

    • Northwestern University

  • Zuhawn Sung

    • Fermi National Accelerator Laboratory (FNAL)

  • Francesco Crisa

    • Fermi National Accelerator Laboratory
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermilab

  • Sabrina Garattoni

    • Fermilab
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermi National Accelerator Laboratory

  • Mustafa Bal

    • Fermi National Accelerator Laboratory
    • Xanadu

  • David N Seidman

    • Northwestern University

  • Alexander Romanenko

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory, Batavia, Illinois, 60510, USA

  • Akshay A Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  View abstract →

• Strategies for Superconducting Transmon Qubits with Millisecond T₁ Relaxation Time

  ORAL · Invited

  March 18, 2026, 1:12 PM – March 18, 2026, 1:48 PM

  Publication: Bal, M., Murthy, A.A., Zhu, S. et al. Systematic improvements in transmon qubit coherence enabled by niobium surface encapsulation. npj Quantum Inf 10, 43 (2024). https://doi.org/10.1038/s41534-024-00840-x
  Full author list: Francesco Crisa1, Shaojiang Zhu1, Akshay A. Murthy1, Mustafa Bal1, Sabrina Garattoni1, Jaeyel Lee1, Zuhawn Sung1, Andrei Lunin1, Daniel Bafia1, Ivan Nekrashevic1, Akanksha Mishra1, Paul Heidler1, David van Zanten1, Cameron J. Kopas2, Ella O. Lachman2, Jayss D. Marshall2, Josh Mutus2, Peter Hopkins3, David Olaya3, John P. Biesecker3, Manuel C. Castellanos Beltram3, Florent Lecocq3, Anthony P. McFadden3, Katarina Cicak3, Micheal R. Vissers3, Jasmine Panthee4, David Garcia4, Mithcell Walker4, Dominic P. Goronzy4, Mark Hersam4, Jinsu Oh5, Lin Zhou5, Alexander Romanenko1, and Anna Grassellino1. 1Fermilab; 2Rigetti Computing; 3NIST; 4Northwestern University 5 AMES National Lab

  Presenters

  • Francesco Crisa

    • Fermi National Accelerator Laboratory
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermilab

  Authors

  • Francesco Crisa

    • Fermi National Accelerator Laboratory
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermilab

  • Akshay A Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  • Shaojiang Zhu

    • Fermi National Accelerator Laboratory (Fermilab)

  • Mustafa Bal

    • Fermi National Accelerator Laboratory
    • Xanadu

  • Sabrina Garattoni

    • Fermilab
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermi National Accelerator Laboratory

  • Jaeyel Lee

    • Fermi National Accelerator Laboratory
    • Fermilab

  • Paul Heidler

    • Fermi National Accelerator Laboratory (Fermilab)

  • Akanksha Mishra

    • Fermi National Accelerator Laboratory
    • Fermi National Accelerator Lab

  • David van Zanten

    • Fermi National Accelerator Laboratory (Fermilab)

  • Alexander Romanenko

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory, Batavia, Illinois, 60510, USA

  View abstract →

• Effect of Annealing on the Superconducting and Surface Properties of Niobium Thin Films

  ORAL

  March 18, 2026, 1:48 PM – March 18, 2026, 2:00 PM

  Presenters

  • Junki Makita

    • Temple University

  Authors

  • Junki Makita

    • Temple University

  • Giulia Berti

    • Temple University

  • David A Garcia-Wetten

    • Northwestern University

  • Dominic P Goronzy

    • Northwestern University

  • Mark C Hersam

    • Northwestern University

  • Michael J Bedzyk

    • Northwestern University

  • Maria Iavarone

    • Temple University

  View abstract →

• Microwave Response of Superconducting Devices with Paramagnetic Impurities

  ORAL

  March 18, 2026, 2:00 PM – March 18, 2026, 2:12 PM

  Presenters

  • Mehdi Zarea

    • Louisiana State University

  Authors

  • Mehdi Zarea

    • Louisiana State University

  • James A Sauls

    • Louisiana State University

  View abstract →

• In situ deposited Al₂O₃ passivated and native AlO_x capped aluminum resonators – comparative studies

  ORAL

  March 18, 2026, 2:12 PM – March 18, 2026, 2:24 PM

  Presenters

  • Lawrence Boyu Young

    • National Taiwan University

  Authors

  • Lawrence Boyu Young

    • National Taiwan University

  • Yi-Ting Cheng

    • National Taiwan University

  • Hsien-Wen Wan

    • National Taiwan University

  • Wei-Jie Yan

    • National Tsing Hua University

  • Chao-Kai Cheng

    • National Taiwan University
    • Graduate Institute of Applied Physics and Department of Physics, National Taiwan University, Taipei 106319

  • Kuan-Hui Lai

    • National Taiwan University
    • Graduate Institute of Applied Physics and Department of Physics, National Taiwan University, Taipei 106319

  • Wan-Sin Chen

    • National Taiwan University

  • Yen-Hsiang Lin

    • National Tsing Hua University
    • Department of Physics, National Tsing Hua University, Hsinchu 300044

  • Juainai Kwo

    • National Tsing Hua University
    • National TsingHua University
    • Department of Physics, National Tsing Hua University, Hsinchu 300044

  • Minghwei Hong

    • National Taiwan University
    • Graduate Institute of Applied Physics and Department of Physics, National Taiwan University, Taipei 106319

  View abstract →

• The Dielectric Dipper: Correlating bulk dielectric loss with underlying material properties

  ORAL

  March 18, 2026, 2:24 PM – March 18, 2026, 2:36 PM

  Presenters

  • Alexander P Read

    • Yale University

  Authors

  • Alexander P Read

    • Yale University

  • Archan Banerjee

    • Yale University

  • Benjamin J Chapman

    • Yale University

  • Luigi Frunzio

    • Yale University

  • Robert J Schoelkopf

    • Yale University

  View abstract →

• Measuring Loss Tangents of Substrates for Superconducting Qubits with Part-per-Billion Precision

  ORAL

  March 18, 2026, 2:36 PM – March 18, 2026, 2:48 PM

  Presenters

  • Daniel Bafia

    • Fermi National Accelerator Laboratory (Fermilab)

  Authors

  • Daniel Bafia

    • Fermi National Accelerator Laboratory (Fermilab)

  • Akshay A Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  • Mustafa Bal

    • Fermi National Accelerator Laboratory (Fermilab)

  • Francesco Crisa

    • Fermi National Accelerator Laboratory
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermilab

  • Sabrina Garattoni

    • Fermilab
    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory (FNAL)
    • Fermi National Accelerator Laboratory

  • Akanksha Mishra

    • Fermi National Accelerator Laboratory
    • Fermi National Accelerator Lab

  • David van Zanten

    • Fermi National Accelerator Laboratory (Fermilab)

  • Roman M Pilipenko

    • Fermi National Accelerator Laboratory

  • Bektur Abdisatarov

    • Fermi National Accelerator Laboratory

  • Alexander Romanenko

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory, Batavia, Illinois, 60510, USA

  View abstract →

• Isolating metal-air and conductor loss in superconducting circuits

  ORAL

  March 18, 2026, 2:48 PM – March 18, 2026, 3:00 PM

  Presenters

  • Yanhao Wang

    • Yale University

  Authors

  • Yanhao Wang

    • Yale University

  • Suhas S Ganjam

    • Google LLC

  • Heekun Nho

    • Yale University

  • Nico Zani

    • Yale University

  • Ishan Narra

    • Yale University

  • Archan Banerjee

    • Yale University

  • Luigi Frunzio

    • Yale University

  • Robert J Schoelkopf

    • Yale University

  View abstract →