用锁模laser驱动低临界电流约瑟夫森结阵列
Driving a low critical current Josephson junction array with a mode-locked laser
摘要：
我们演示了由锁模激光器和光时分复用器产生的光脉冲驱动的约瑟夫森结阵列（JJA）的操作。一个商用光电二极管将光脉冲转换成电子脉冲，并置于距JJA几厘米的液氦中。我们定制的锁模激光器的性能足以在多个Shapiro步骤中以低临界电流驱动JJA。我们的光学方法是快速和节能脉冲驱动的潜在推动者，而无需昂贵的高带宽电脉冲模式发生器，也无需跨越温度级的高带宽电缆。我们的测量和模拟激发了光电二极管和JJA的改进集成，例如，倒装芯片技术，以提高脉冲驱动约瑟夫森任意波形合成器（JAWS）的理解和保真度。
英文摘要：
We demonstrate the operation of Josephson junction arrays (JJA) driven by optical pulses generated by a mode-locked laser and an optical time-division multiplexer. A commercial photodiode converts the optical pulses into electrical ones in liquid helium several cm from the JJA. The performance of our custom-made mode-locked laser is sufficient for driving a JJA with low critical current at multiple Shapiro steps. Our optical approach is a potential enabler for fast and energy-efficient pulse drive without expensive high-bandwidth electrical pulse pattern generator, and without high-bandwidth electrical cabling crossing temperature stages. Our measurements and simulations motivate an improved integration of photodiodes and JJAs using, e.g., flip-chip techniques, in order to improve both the understanding and fidelity of pulse-driven Josephson Arbitrary Waveform Synthesizers (JAWS).
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