The influence of radio-frequency microwaves on the Coulomb blockade characteristics in small Josephson junctions was studied using a one-dimensional array of ten small Al tunnel junctions in the frequency range from 1 to 1000 MHz. Coulomb blockade voltage ( $$V_\mathrm{th}$$ V th ) is diminished with increasing microwave power ( $$V_\mathrm{ac}$$ V ac ), where the $$V_\mathrm{th}$$ V th – $$V_\mathrm{ac}$$ V ac plots for varied frequencies fall on a single curve. We observed and theoretically analyzed a magnetic field dependent renormalization of the applied microwave power, in addition to a magnetic field independent renormalization effect explained using an effective circuit approach of the array. Due to its high sensitivity to microwave power, the array is well-suited for on-chip detection applications in low-temperature environments.

中文翻译：

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射频辐射下小型约瑟夫森结阵列中的库珀对隧道

使用频率范围为 1 至 1000 MHz 的十个小铝隧道结的一维阵列研究了射频微波对小约瑟夫森结中库仑阻塞特性的影响。库仑阻塞电压 ( $$V_\mathrm{th}$$V th ) 随着微波功率 ( $$V_\mathrm{ac}$$ V ac ) 的增加而减小，其中 $$V_\mathrm{th}$$ V th – $$V_\mathrm{ac}$$ V ac 不同频率的图落在一条曲线上。除了使用阵列的有效电路方法解释的与磁场无关的重整化效应之外，我们观察并从理论上分析了所施加的微波功率的依赖于磁场的重整化。由于其对微波功率的高灵敏度，该阵列非常适合低温环境中的片上检测应用。