Kavli Affiliate: Mohammad Mirhosseini
| First 5 Authors: Farzad B. Faramarzi, Peter K. Day, Jacob Glasby, Sasha Sypkens, Marco Colangelo
| Summary:
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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