Tunable superconducting notch filter

A method for providing a superconductor tunable notch filter, the method comprising:

• configuring a Josephson junction filter array connected to a coupling pad and connected to ground, the Josephson junction filter array comprising a filter inductance (Lf);
• wherein the Josephson junction filter array connected to the coupling pad forms a filter capacitance (Cf);
• configuring a Josephson junction bias array connected to the coupling pad and connected to a current source, the Josephson junction bias array comprising a bias inductance (Lbias);
• configuring a transmission line connected to the coupling pad in which connection of the transmission line and the coupling pad form a coupling capacitance, such that the filter inductance and the filter capacitance connect to the transmission line through the coupling capacitance;
• wherein the Josephson junction filter array comprises a notch filter frequency that is tunable according to a magnitude of a current bias from the current source.