论文标题
超导量子电子和放大器的重叠连接
Overlap junctions for superconducting quantum electronics and amplifiers
论文作者
论文摘要
由于其独特的属性是无损的非线性电路元素，约瑟夫森连接处于超导量子信息处理的核心。以前，我们证明了一个两层尺度的重叠连接工艺，适用于长时间相干时间的量子。在这里，我们将重叠连接过程扩展到千分尺尺度连接。这使我们能够制造其他超导量子设备。例如，我们演示了一个基于重叠的约瑟夫森参数放大器，该放大器仅使用2层。这种有效的制造工艺可产生可识别的插入损失，增益约30 dB。与其他过程相比，重叠连接可以通过最小的基础设施，高收益和最先进的设备性能进行制造。
Due to their unique properties as lossless, nonlinear circuit elements, Josephson junctions lie at the heart of superconducting quantum information processing. Previously, we demonstrated a two-layer, submicrometer-scale overlap junction fabrication process suitable for qubits with long coherence times. Here, we extend the overlap junction fabrication process to micrometer-scale junctions. This allows us to fabricate other superconducting quantum devices. For example, we demonstrate an overlap-junction-based Josephson parametric amplifier that uses only 2 layers. This efficient fabrication process yields frequency-tunable devices with negligible insertion loss and a gain of ~ 30 dB. Compared to other processes, the overlap junction allows for fabrication with minimal infrastructure, high yield, and state-of-the-art device performance.
