论文标题
使用可调耦合器在磁通子上的高保真双方大门
High fidelity two-qubit gates on fluxoniums using a tunable coupler
论文作者
论文摘要
超导磁盘量子位为通向大规模超导体量子计算的路径上的通道提供了一种有希望的替代方法，因为它们的相干性更好和较大的非谐度。多Qubit Fluxonium设备的一个主要挑战是实验证明具有高富达单Qubit和双Quibit Gates的可扩展串扰的无Qubit架构，单发读数和状态初始化。在这里，我们介绍了一个基于可调的耦合器元件的两倍基于Fuxonium的量子处理器，遵循我们的理论建议[DOI：10.1063/5.0064800]。我们在实验上以$ 99.55 \％$和$ 99.23 \％$ fidelities的价格展示了FSIM型和受控的Z门。残留的ZZ相互作用被抑制至几个kHz水平。使用循环耦合的通量控制线，我们用每值一个任意波形发电机通道实现高保真单一Qubit和基态初始化。
Superconducting fluxonium qubits provide a promising alternative to transmons on the path toward large-scale superconductor-based quantum computing due to their better coherence and larger anharmonicity. A major challenge for multi-qubit fluxonium devices is the experimental demonstration of a scalable crosstalk-free multi-qubit architecture with high fidelity single-qubit and two-qubit gates, single-shot readout and state initialization. Here, we present a two-qubit fluxonium-based quantum processor with a tunable coupler element following our theoretical proposal [DOI: 10.1063/5.0064800]. We experimentally demonstrate fSim-type and controlled-Z gates with $99.55\%$ and $99.23\%$ fidelities, respectively. The residual ZZ interaction is suppressed down to the few kHz level. Using a galvanically coupled flux control line, we implement high fidelity single-qubit gates and ground state initialization with a single arbitrary waveform generator channel per qubit.
