论文标题
具有46 Na灵敏度的绝热超导体比较器
An adiabatic superconductor comparator with 46 nA sensitivity
论文作者
论文摘要
绝热的量子 - 频率 - parametron（AQFP）电路可以以极小的能量耗散（在5 GHz时〜1 ZJ）和高灵敏度（〜1μA）进行，因此由于绝热开关。因此，AQFP逻辑适合用作低温探测器的读数界面，例如超导纳米线单光子检测器（SSPDS）。为了将AQFP逻辑的应用扩展到各种检测器，至关重要的是达到更好的灵敏度，因为某些检测器（例如WSI SSPDS和过渡边缘传感器（TESS））需要sub-μa敏感性。在本研究中，我们提出了具有电流变压器（CT）的高敏化AQFP比较器，从而增加了等效输入电流，从而提高了灵敏度。数值模拟表明，所提出的比较器的灵敏度大约是常规AQFP比较器的灵敏度。此外，在实验中，我们证明了46 na在4.2 K时的灵敏度为46 Na。
Adiabatic quantum-flux-parametron (AQFP) circuits can operate with extremely small energy dissipation (~1 zJ per junction at 5 GHz) and high sensitivity (~1 μA) owing to adiabatic switching. Thus, AQFP logic is suitable to use as readout interfaces for cryogenic detectors, such as superconducting nanowire single-photon detectors (SSPDs). In order to extend the application of AQFP logic to various detectors, it is crucial to achieve even better sensitivity because some detectors, such as WSi SSPDs and transition edge sensors (TESs), require sub-μA sensitivity. In the present study, we propose a high-sensitivity AQFP comparator with a current transformer (CT), which increases the equivalent input current and thereby improves the sensitivity. Numerical simulation shows that the proposed comparator achieves a sensitivity approximately six times better than that of a conventional AQFP comparator. Furthermore, we demonstrate a sensitivity of 46 nA at 4.2 K for a sampling frequency of 500 Hz in the experiment.
