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Published August 2021 | Submitted
Journal Article Open

Initial Design of a W-Band Superconducting Kinetic Inductance Qubit

Abstract

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 Δ/h , beyond which photons break Cooper pairs. For example, NbTiN with T_c = 15K 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.

Additional Information

© 2021 IEEE. Manuscript received December 1, 2020; revised January 30, 2021; accepted February 15, 2021. Date of publication March 11, 2021; date of current version April 6, 2021. The work of Marco Colangelo and Karl K. Berggren was supported by National Science Foundation under Grant ECCS-2000743 (MIT).

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August 20, 2023
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October 20, 2023