Initial Design of a W-Band Superconducting Kinetic Inductance Qubit

Farzad Faramarzi, Peter Day, Jacob Glasby, Sasha Sypkens, Marco Colangelo, Ralph Chamberlin, Mohammad Mirhosseini, Kevin Schmidt, Karl K. Berggren, Philip Mauskopf

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Superconducting qubits are widely used in quantum computing research and industry. We describe a superconducting kinetic inductance qubit (and introduce the term Kineticon to describe it) operating at W-band frequencies with a nonlinear nanowire section that provides the anharmonicity required for two distinct quantum energy states. Operating the qubits at higher frequencies may relax the dilution refrigerator temperature requirements for these devices and paves the path for multiplexing a large number of qubits. Millimeter-wave operation requires superconductors with relatively high T_c, which implies high gap frequency, 2\Delta /h, beyond which photons break Cooper pairs. For example, NbTiN with T_c =15\,\text{K} has a gap frequency near 1.4 THz, which is much higher than that of aluminum (90 GHz), allowing for operation throughout the millimeter-wave band. Here we describe a design and simulation of a W-band Kineticon qubit embedded in a 3-D cavity. We perform classical electromagnetic calculations of the resulting field distributions.

Original languageEnglish (US)
Article number9376254
JournalIEEE Transactions on Applied Superconductivity
Issue number5
StatePublished - Aug 2021


  • Kinetic inductance
  • mm-wave
  • quantum computing
  • superconducting qubits

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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