Engineering Framework for Optimizing Superconducting Qubit Designs

TL;DR

This paper presents an engineering framework for optimizing superconducting qubit designs by abstracting circuit parameters, enabling improved trade-offs between coherence times and anharmonicity, supported by experimental validation.

Contribution

A generalized superconducting qubit model that facilitates multi-property optimization across circuit design parameters.

Findings

Achieved high anharmonicity (~1 GHz) with long coherence times (T1=40-80 μs)

Validated the model through experimental investigation of a specific parameter regime

Demonstrated the framework's potential for guiding superconducting qubit design improvements

Abstract

Superconducting quantum technologies require qubit systems whose properties meet several often conflicting requirements, such as long coherence times and high anharmonicity. Here, we provide an engineering framework based on a generalized superconducting qubit model in the flux regime, which abstracts multiple circuit design parameters and thereby supports design optimization across multiple qubit properties. We experimentally investigate a special parameter regime which has both high anharmonicity ($\sim\!1$GHz) and long quantum coherence times ($T_1\!=\!40\!-\!80\,\mathrm{\mu s}$ and $T_\mathrm{2Echo}\!=\!2T_1$).