Cited by 143Superconducting and THz Device TechnologyQuantum Information and CryptographySuperconducting Materials and Applications

Qubit compatible superconducting interconnects

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Foxen, B, Mutus, J Y, Lucero, E, Graff, R, Megrant, A, Chen, Yu, Quintana, C, Burkett, B +22 more·2018·Quantum Science and Technology

Abstract

We present a fabrication process for fully superconducting interconnects compatible with superconducting qubit technology. These interconnects allow for the three dimensional integration of quantum circuits without introducing lossy amorphous dielectrics. They are composed of indium bumps several microns tall separated from an aluminum base layer by titanium nitride which serves as a diffusion barrier. We measure the whole structure to be superconducting (transition temperature of 1.1 K), limited by the aluminum. These interconnects have an average critical current of 26.8 mA, and mechanical shear and thermal cycle testing indicate that these devices are mechanically robust. Our process provides a method that reliably yields superconducting interconnects suitable for use with superconducting qubits.

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Research works printed but not linked: 2

  1. O'Brien W et al 2017 Superconducting Caps for Quantum Integrated Circuits ArXiv e-prints
  2. Wade K and Banister A J 1973 Pergamon texts in Inorganic Chemistry The Chemistry of Aluminium, Gallium, Indium and Thallium (Elmsford, NY: Pergamon Press)

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Authors
Foxen, B., Mutus, J. Y., Lucero, E., Graff, R., Megrant, A., Chen, Y., Quintana, C., Burkett, B., Kelly, J., Jeffrey, E., Yang, Y., Yu, A., Arya, K., Barends, R., Chen, Z., Chiaro, B., Dunsworth, A., Fowler, A., Gidney, C., Giustina, M., Huang, T., Klimov, P., Neeley, M., Neill, C., Roushan, P., Sank, D., Vainsencher, A., Wenner, J., White, T. C., & Martinis, J. M.
Affiliations
  • University of California, Santa Barbara (US)
  • Google (United States) (US)
Corresponding author
Martinis, John M
Venue
Quantum Science and Technology
Published
2017-11-29
Volume
3
Issue
1
Pages
014005
ISSN
2058-9565 (ISSN-L)
OpenAlex
W2748822299
Cited by
143
References
22
Citations by year
2026: 8 · 2025: 10 · 2024: 27 · 2023: 22 · 2022: 17 · 2021: 21 · 2020: 14 · 2019: 10 · 2018: 11 · 2017: 3
FWCI
5.69
Type
journal article
Language
en
Open access
Locations
  • Quantum Science and Technology (publishedVersion, cc-by)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Division of Graduate Education (DGE- 1144085)
  • Google (JMGI01)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Superconducting and THz Device Technology
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Engineering › Biomedical Engineering › Superconducting Materials and Applications
Keywords
superconducting interconnects, superconducting qubits, indium bumps, critical current, mechanical robustness, thermal cycling, fabrication techniques

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