低温冷却单通量量子（SFQ）电路的许多优点意味着高速和低压输出信号必须被放大并与标准电子设备连接。需要最先进的低噪声和宽带放大器与室温电子设备接口。一种解决方案是将前置放大器放置在低温阶段，这需要特定的半导体设计和制造。然而，一个更可行和节能的方法是集成脉冲逻辑电路输出级与片上超导体前置放大器。我们设计、制作并测试了一种集成SFQ电路输出级的片上紧凑型倍压器，以增加SFQ脉冲的电压幅度。该电路采用与逻辑电路相同的技术设计，因此其噪声水平较低，并且与CMOS放大器相比，它工作在更高的频率下，并且由于它的量化性质，没有增加噪声。所制造的电路具有160 um x 320 um的紧凑尺寸，并且在仿真中在高达~25 GHz的频率下提供约10 dB的增益，测量输出电压为600 uV。通过堆叠更多的电平，如仿真所示，可以在电路级实现超过20 dB的增益。此外，超导电压放大器的增益是量化的和可编程的。
英文摘要：
The many advantages of cryogenically-cooled Single-Flux Quantum (SFQ) circuits imply that the high speed and low voltage output signals must be amplified and interfaced with standard electronics. State-of-the-art low-noise and wide-band amplifiers are required to interface with room temperature electronics. One solution is to place preamplifiers at the cryogenic stage, which requires specific semiconductor design and fabrication. However, a more viable and energy-efficient approach is to integrate the pulsed logic circuit output stages with on-chip superconductor preamplifiers. We designed, fabricated, and tested an on-chip compact voltage multiplier integrated with the output stage of SFQ circuits to increase the voltage amplitude of SFQ pulses. The circuit is designed with the same technology as the logic circuit hence its noise level is lower, and it works at higher frequencies compared to CMOS amplifiers and due to quantized nature of it there is no added noise. The fabricated circuit has a compact size of 160 um x 320um and provides about 10 dB gain with measured 600 uV output voltage at frequencies up to ~25 GHz in simulations. By stacking more levels, over 20 dB gain at circuit level is achievable as shown in simulations. Moreover the gain of the superconductor voltage amplifier is quantized and programmable.
Nanoscale High Transition Temperature Superconducting Quantum Interference Device Transimpedance Amplifier
随着量子电子学的发展，需要一系列重要的支持电子学来将这些新设备与我们的经典世界联系起来。在超导电子学的情况下，这是一个挑战，因为它们所基于的约瑟夫森结器件需要微小的电流脉冲来创建和操纵引导其操作的单通量量子。在通过大的温度梯度转换这些信号以连接到半导体部件时出现困难。在这项工作中，我们提出了纳米超导量子干涉器件（SQUID）的临界尺寸小到10 nm的高转变温度超导体YBa $_2$ Cu $_3$ O $_{7-δ}$（YBCO）。我们将这些纳米SQUID与纳米隔离电感耦合控制线集成，以创建能够在非常宽的温度范围内进行跨阻抗转换的低功率超导输出驱动器。
