A double-flux-quantum amplifier with a single flux-biasing line
A double-flux-quantum amplifier with a single flux-biasing line
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具有单磁通偏置线的双磁通量子放大器
DOI：
10.1088/1742-6596/1054/1/012062
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Mizugaki Yoshinao
中科院分区：
文献类型：
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作者：
Arai Yuma;Urai Yoshiaki;Watanabe Tomoki;Higuchi Komei;Shimada Hiroshi;Mizugaki Yoshinao
双通量量子（DFQ）放大器可以使用在欠阻尼约瑟夫森结处的DFQ产生将其输入电压与量子精度相乘。我们对使用DFQ放大器实现的数模转换器进行了研究。传统的DFQ放大器通常使用两个磁通偏置线。在这项研究中，我们重新设计的电路布局，实现使用一个单一的磁通偏置线操作。设计了一种新的20倍DFQ放大器版图，并采用2.5kA/cm 2 Nb/AlOx/Nb工艺进行了制作。测量在液态He中进行。单通量量子（SFQ）脉冲序列馈入使用过偏置的方法，并使用示波器获得的输入输出特性。当不提供磁通偏置电流I fb 1时，最大输入电压V inmax为68 μV，这是我们先前研究中观察到的值17 μV的4.2倍。当I fb 1为1.00 mA时，V inmax提高到120 μV。
A Double-Flux-Quantum (DFQ) amplifier can multiply its input voltage with quantum accuracy using DFQ generation at under-damped Josephson junctions. We conducted research on digital-to-analogue converters that were implemented using DFQ amplifiers for metrological applications. Conventional DFQ amplifiers were usually operated using two flux-biasing lines. In this study, we redesigned the circuit layout to realize operation using a single flux-biasing line. We designed a new layout of a 20-fold DFQ amplifier and fabricated it using a 2.5-kA/cm 2 Nb/AlO x/Nb process. The measurement was performed in liquid He. The Single-Flux-Quantum (SFQ) pulse train was fed using an over-biasing method, and the input-output characteristics are acquired using an oscilloscope. When the magnetic flux bias current I fb1 was not supplied, the maximum input voltage V inmax was 68 μV, which was 4.2 times larger than the value of 17 μV that was observed in our previous study. V inmax was enhanced to 120 μV when we supplied an I fb1 of 1.00 mA.