The root-mean-square (rms) output voltage of the National Institute of Standards and Technology (NIST) Josephson arbitrary waveform synthesizer (JAWS) has been doubled from 1 V to a record 2 V by combining two new 1 V chips on a cryocooler. This higher voltage will improve calibrations of ac thermal voltage converters and precision voltage measurements that require state-of-the-art quantum accuracy, stability, and signal-to-noise ratio. We achieved this increase in output voltage by using four on-chip Wilkinson dividers and eight inner/outer dc blocks, which enable biasing of eight Josephson junction (JJ) arrays with high-speed inputs from only four high-speed pulse generator channels. This approach halves the number of pulse generator channels required in future JAWS systems. We also implemented on-chip superconducting interconnects between JJ arrays, which reduces systematic errors and enables a new modular chip package. Finally, we demonstrate a new technique for measuring and visualizing the operating current range that reduces the measurement time by almost two orders of magnitude and reveals the relationship between distortion in the output spectrum and output pulse sequence errors.

中文翻译：

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使用威尔金森分频器的两伏约瑟夫森任意波形合成器

通过在低温冷却器上结合两个新的 1 V 芯片，美国国家标准与技术研究院 (NIST) 约瑟夫森任意波形合成器 (JAWS) 的均方根 (rms) 输出电压已从 1 V 翻倍至创纪录的 2 V . 这种更高的电压将改进交流热电压转换器的校准和需要最先进的量子精度、稳定性和信噪比的精确电压测量。我们通过使用四个片上威尔金森分压器和八个内部/外部直流块实现了输出电压的这种增加，这使得八个约瑟夫森结 (JJ) 阵列能够通过仅来自四个高速脉冲发生器通道的高速输入进行偏置。这种方法将未来 JAWS 系统所需的脉冲发生器通道数量减半。我们还在 JJ 阵列之间实现了片上超导互连，这减少了系统误差并实现了新的模块化芯片封装。最后，我们展示了一种用于测量和可视化工作电流范围的新技术，该技术将测量时间减少了几乎两个数量级，并揭示了输出频谱失真与输出脉冲序列误差之间的关系。