Weakly Flux-Tunable Superconducting Qubit
- URL: http://arxiv.org/abs/2203.04164v1
- Date: Tue, 8 Mar 2022 15:49:48 GMT
- Title: Weakly Flux-Tunable Superconducting Qubit
- Authors: Jos\'e M. Ch\'avez-Garcia, Firat Solgun, Jared B. Hertzberg, Oblesh
Jinka, Markus Brink, Baleegh Abdo
- Abstract summary: We develop a coherent, flux-tunable, transmon-like qubit with a frequency tunability range as small as 43 MHz.
Such a weakly tunable qubit is useful for avoiding frequency collisions in a large lattice while limiting its susceptibility to flux noise.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Flux-tunable qubits are a useful resource for superconducting quantum
processors. They can be used to perform cPhase gates, facilitate fast reset
protocols, avoid qubit-frequency collisions in large processors, and enable
certain fast readout schemes. However, flux-tunable qubits suffer from a
trade-off between their tunability range and sensitivity to flux noise.
Optimizing this trade-off is particularly important for enabling fast,
high-fidelity, all-microwave cross-resonance gates in large, high-coherence
processors. This is mainly because cross-resonance gates set stringent
conditions on the frequency landscape of neighboring qubits, which are
difficult to satisfy with non-tunable transmons due to their relatively large
fabrication imprecision. To solve this problem, we realize a coherent,
flux-tunable, transmon-like qubit, which exhibits a frequency tunability range
as small as 43 MHz, and whose frequency, anharmonicity and tunability range are
set by a few experimentally achievable design parameters. Such a weakly tunable
qubit is useful for avoiding frequency collisions in a large lattice while
limiting its susceptibility to flux noise.
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