INRiM - Istituto Nazionale di Ricerca Metrologica, Torino, Italy.
Politecnico di Torino, Torino, Italy.
PLoS One. 2018 Dec 17;13(12):e0209246. doi: 10.1371/journal.pone.0209246. eCollection 2018.
This paper presents an open-source package developed in Python that controls and drives a programmable Josephson array to synthesize dc and ac quantum-accurate voltages. Programmable arrays are devices subdivided into independent subsections, each counting a number of series connected Josephson junctions that follows a binary sequence (1, 2, 4, 8, …) to control the output voltage. Our software allows to independently measure the current-voltage characteristics of each subsection by means of a set of arbitrary waveform generators and a nanovoltmeter that measures the voltage across the whole array with high sensitivity. A quantization test tool is also provided to check with sub-microvolt resolution whether the array is operating on its quantum margins. The code is modular and easily expandable with the support of many libraries, allowing prompt reconfiguration for different calibration and testing purposes. It is aimed at being a starting point for cooperation between National Metrology Institutes towards the realization of a shared quantum voltage calibration infrastructure.
本文提出了一个用 Python 开发的开源软件包，用于控制和驱动可编程约瑟夫森数组，以合成直流和交流量子精确电压。可编程数组是一种设备，它被细分为独立的子部分，每个子部分包含数量为串联约瑟夫森结的整数倍，这些约瑟夫森结按照二进制序列（1、2、4、8、……）排列，以控制输出电压。我们的软件允许通过一组任意波形发生器和纳米伏特计来独立测量每个子部分的电流-电压特性，纳米伏特计具有高灵敏度，可以测量整个数组的电压。还提供了一个量子化测试工具，以亚微伏分辨率检查数组是否在其量子边缘工作。该代码是模块化的，并且可以通过许多库的支持进行轻松扩展，允许根据不同的校准和测试目的进行快速重新配置。它旨在成为国家计量研究所之间合作的起点，以实现共享的量子电压校准基础设施。
