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-In-person

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

  Presenters

  • Amlan Datta

    • Ames National Laboratory

  Authors

  • Amlan Datta

    • Ames National Laboratory

  • Kamal Joshi

    • Iowa State University

  • Bicky Singh Moirangthem

    • Iowa State University

  • Tony McFadden

    • National Institute of Standards and Technology (NIST)

  • Florent Lecocq

    • National Institute of Standards and Technology (NIST)

  • Ray Simmonds

    • National Institute of Standards and Technology Boulder

  • Matthew Kramer

  • Makariy Tanatar

  • Ruslan Prozorov

    • Iowa State University

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• Identifying Decoherence Mechanisms in Superconducting Qubits through Advanced Materials Characterization

  Oral-In-person

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

  Presenters

  • Akshay Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  Authors

  • Akshay Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  • Jaeyel Lee

    • Fermi National Accelerator Laboratory

  • Zuhawn Sung

    • Fermi National Accelerator Laboratory (FNAL)

  • Shaojiang Zhu

    • Fermi National Accelerator Laboratory (Fermilab)

  • Mustafa Bal

    • Fermi National Accelerator Laboratory

  • Francesco Crisa

  • sabrina garattoni

    • Fermi National Accelerator Laboratory (Fermilab)

  • Alexander Romanenko

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)

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• Influence of intrinsic film stress on superconducting quantum circuit performance

  Oral-In-person

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

  Presenters

  • David Bunch

    • Walther Meissner Inst

  Authors

  • David Bunch

    • Walther Meissner Inst

  • Leon Koch

    • Technical University of Munich

  • Niklas Bruckmoser

    • Technical University of Munich

  • Lea Richard

    • Walther Meissner Inst

  • Julius Feigl

  • Vera Bader

  • Lasse Södergren

  • Stephan Geprägs

  • Stefan Filipp

    • Technical University of Munich

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

  Oral-In-person

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

  Presenters

  • Abraham Campos Contreras

    • CEA LETI

  Authors

  • Abraham Campos Contreras

    • CEA LETI

  • Michaël Bouvier

  • Sampo Saarinen

  • Thomas Magis

  • Richard Souil

  • Christophe Porzier

  • Felix Rautschke

    • ALICE & BOB

  • Paul Magnard

    • ALICE & BOB

  • Julien Roul

  • Julien Rioux

  • Stephane Polis

  • William Piedot

  • Romeck Kloezen

  • Alireza Mottaghizadeh

  • Antoine GRAS

    • ALICE & BOB

  • Mikaël Cassé

  • Brice Tavel

    • CEA Grenoble Center

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• Abstract Withdrawn

  Withdrawn

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

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

  Oral-In-person

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

  Presenters

  • Jaeyel Lee

    • Fermi National Accelerator Laboratory

  Authors

  • Jaeyel Lee

    • Fermi National Accelerator Laboratory

  • Dieter Isheim

    • Northwestern University

  • Zuhawn Sung

    • Fermi National Accelerator Laboratory (FNAL)

  • Francesco Crisa

  • sabrina garattoni

    • Fermi National Accelerator Laboratory (Fermilab)

  • Mustafa Bal

    • Fermi National Accelerator Laboratory

  • David Seidman

    • Northwestern University

  • Alexander Romanenko

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)

  • Akshay Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

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• Strategies for Superconducting Transmon Qubits with Millisecond T₁ Relaxation Time

  Invited-In-person · 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 (Fermilab)

  Authors

  • Francesco Crisa

    • Fermi National Accelerator Laboratory (Fermilab)

  • Akshay Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  • Shaojiang Zhu

    • Fermi National Accelerator Laboratory (Fermilab)

  • Mustafa Bal

    • Fermi National Accelerator Laboratory

  • sabrina garattoni

    • Fermi National Accelerator Laboratory (Fermilab)

  • Jae Yel Lee

  • Paul Heidler

    • Fermi National Accelerator Laboratory (Fermilab)

  • Akanksha Mishra

    • University of Washington

  • David van Zanten

    • Fermi National Accelerator Laboratory (Fermilab)

  • Alexander Romanenko

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)

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

  Oral-In-person

  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 Garcia

    • Northwestern University

  • Dominic Goronzy

    • Northwestern University

  • Mark Hersam

    • Northwestern University

  • Michael Bedzyk

    • Northwestern University

  • Maria Iavarone

    • Temple University

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• Microwave Response of Superconducting Devices with Paramagnetic Impurities

  Oral-In-person

  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 Sauls

    • Louisiana State University

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

  Oral-In-person

  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

  • Hsien-Wen Wan

    • National Taiwan University

  • Wei-Jie Yan

  • Chao-Kai Cheng

    • NSRRC

  • Kuan-Hui Lai

    • National Taiwan University

  • Wan-Sin Chen

  • Yen-Hsiang Lin

  • Jueinai Kwo

    • National Tsing Hua University

  • Minghwei Hong

    • National Taiwan University

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

  Oral-In-person

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

  Presenters

  • Alexander Read

    • Yale University

  Authors

  • Alexander Read

    • Yale University

  • Archan Banerjee

    • Yale University

  • Benjamin Chapman

    • Yale University

  • Luigi Frunzio

    • Yale University

  • Robert Schoelkopf

    • Yale University

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

  Oral-In-person

  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 Murthy

    • Fermi National Accelerator Laboratory (Fermilab)

  • Mustafa Bal

    • Fermi National Accelerator Laboratory (Fermilab)

  • Francesco Crisa

  • sabrina garattoni

    • Fermi National Accelerator Laboratory (Fermilab)

  • Akanksha Mishra

  • David van Zanten

    • Fermi National Accelerator Laboratory (Fermilab)

  • Roman Pilipenko

  • Bektur Abdisatarov

    • Superconducting Quantum Materials and Systems Center, Fermi National Accelerator Laboratory (FNAL)

  • Alexander Romanenko

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)

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• Isolating metal-air and conductor loss in superconducting circuits

  Oral-In-person

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

  Presenters

  • Yanhao Wang

    • Yale University

  Authors

  • Yanhao Wang

    • Yale University

  • Suhas Ganjam

    • Google LLC

  • Heekun Nho

    • Yale University

  • Nico Zani

    • Yale University

  • Ishan Narra

    • Yale University

  • Archan Banerjee

    • Yale University

  • Luigi Frunzio

    • Yale University

  • Robert Schoelkopf

    • Yale University

  View abstract →