Initial Design of a W-band Superconducting Kinetic Inductance Qubit (Kineticon)

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$\Delta /h$, 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.

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Cited by in corpus (6)

• Nonlinearity and wideband parametric amplification in an NbTiN microstrip transmission line
• Wafer-Scale MgB2 Superconducting Devices
• Low-loss Millimeter-wave Resonators with an Improved Coupling Structure
• Development of Superconducting On-chip Fourier Transform Spectrometers
• Millimetre Wave Kinetic Inductance Parametric Amplification using Ridge Gap Waveguide
• Nonlinear Co-simulation for Designing Kinetic Inductance Parametric Amplifiers