Interconnects are a major discriminator for superconducting digital technology, enabling energy-efficient data transfer and high-bandwidth heterogeneous integration. We report a method to simulate propagation of picosecond pulses in superconducting passive transmission lines (PTLs). A frequency-domain propagator model obtained from the Ansys high-frequency structure simulator (HFSS) field solver is incorporated in a Cadence Spectre circuit model, so that the particular PTL geometry can be simulated in the time-domain. The Mattis Bardeen complex conductivity of the superconductor is encoded in the HFSS field solver as a complex-conductivity insulator. Experimental and simulation results show that Nb 20 Ω microstrip PTLs with 200 nm interlayer dielectric thickness can support propagation of a single-flux-quantum pulse up to 7 mm and a double-flux-quantum pulse up to 28 mm.

中文翻译：

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皮秒脉冲在超导传输线互连上的传播*

互连是超导数字技术的主要鉴别器，可实现节能数据传输和高带宽异构集成。我们报告了一种模拟超导无源传输线 (PTL) 中皮秒脉冲传播的方法。从 Ansys 高频结构模拟器 (HFSS) 场解算器获得的频域传播模型被整合到 Cadence Spectre 电路模型中，因此可以在时域中模拟特定的 PTL 几何结构。超导体的 Mattis Bardeen 复电导率在 HFSS 场解算器中编码为复电导绝缘体。