We describe the implementation of new commercial pulse-bias electronics that have enabled an improvement in the generation of quantum-accurate waveforms both with and without low-frequency compensation biases. We have used these electronics to apply a multilevel pulse bias to the Josephson arbitrary waveform synthesizer and have generated, for the first time, a quantum-accurate bipolar sinusoidal waveform without the use of a low-frequency compensation bias current. This uncompensated 1 kHz waveform was synthesized with an rms amplitude of 325 mV and maintained its quantum accuracy over a 1.5 mA operating current range. The same technique and equipment was also used to synthesize a quantum-accurate 1 MHz sinusoid with a 1.2 mA operating margin. In addition, we have synthesized a compensated 1 kHz sinusoid with an rms amplitude of 1 V and a 2.7 mA operating margin.

中文翻译：

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具有多电平脉冲偏置的 Josephson 任意波形合成

我们描述了新的商业脉冲偏置电子设备的实现，这些电子设备在有和没有低频补偿偏置的情况下都能够改进量子精确波形的生成。我们已经使用这些电子设备将多级脉冲偏置应用于约瑟夫森任意波形合成器，并首次在不使用低频补偿偏置电流的情况下生成了量子精确的双极正弦波形。这种未补偿的 1 kHz 波形以 325 mV 的均方根幅度合成，并在 1.5 mA 工作电流范围内保持其量子精度。相同的技术和设备也用于合成具有 1.2 mA 操作裕度的量子精确 1 MHz 正弦曲线。此外，我们还合成了一个 rms 幅度为 1 V 和 2 的补偿 1 kHz 正弦曲线。