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Bulletin of the American Physical Society

Experimental realization of ultra-high fidelity qubit operations with tunable fluxonium qubits

Tenghui Wang, Jin Qin, Hao Deng, Dawei Ding, Ran Gao, Xun Gao, Hsiang‐Sheng Ku, Jiang Xun, Zhisheng Li, Xiaotong Ni, Zhijun Song, Hantao Sun, Chengchun Tang, Feng Wu, Wenlong Yu, Tian Xia, Gengyan Zhang, Xiaohang Zhang, Jingwei Zhou, Xing Zhu, Additional Contributing Aql Members, Yaoyun Shi, Jianxin Chen, Hui‐Hai Zhao, Chunqing Deng

Published Mar 17, 2021• 0 citations
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Fluxonium qubits have demonstrated high-fidelity operations and long coherence times in small-scale systems, highlighting their promise for quantum computing. However, large-scale integration into a high-performance two-dimensional (2D) qubit array remains the central challenge for practical applications. In this work, we introduce an extensible architecture for scaling up fluxonium qubits in 2D grids. To address the key challenges, namely achieving controllable strong interaction and high connectivity for qubits featuring small shunting capacitors (footprints), we propose using low-shunt-capacitance couplers to enable tunable interactions between fluxonium qubits. When embedded into 2D square lattices, large couplings can be achieved even with relatively small coupling capacitances, thus enabling multiple connections with sufficient capacitance budget. We further propose coupler realizations based on generalized flux qubit circuits, specifically the quarton and the fluxonium, and demonstrate that both enable fast, high-fidelity gates with low spectator errors, while supporting multiple connections on 2D grids.
In recent years, several architectures have been proposed for implementing two-qubit operations on fluxonium superconducting qubits. A particularly promising approach, which was demonstrated experimentally by Refs. [1,2], employs a transmon superconducting qubit as a tunable coupler between the fluxonium qubits. These experiments have shown that the transmon coupler enables fast, high-fidelity two-qubit operations while suppressing unwanted ZZ crosstalk between the fluxonium qubits. In this work, we numerically study the scalability of this architecture. We find that, when trivially scaling this architecture, crosstalk from spectator qubits limits the gate fidelity to below 90%. We show that these spectator errors can be reduced to below 10−410^{-4}10−4 by reducing the coupling strength and by dynamically tuning transmons that are not used for a two-qubit operation to an off position. We further investigate the resilience of the operation to direct capacitive coupling between the transmon couplers and to microwave crosstalk.