Selective switching of frequency multiplexed microwave signals using cascading multi-path interferometric Josephson switches with nonoverlapping bandwidths

A method to form a cascading selective microwave switch (cascade), the method comprising:

• fabricating a set of Josephson devices, each Josephson device in the set having a corresponding operating bandwidth of microwave frequencies;
• and
• forming a series coupling between a first Josephson device from the set and an nth Josephson device from the set, wherein the series coupling causes the first Josephson device in an open state to reflect back to an input port of the first Josephson device a signal of a first frequency from a frequency multiplexed microwave signal (multiplexed signal) and the nth Josephson device in a closed state to transmit a signal of an nth frequency in the multiplexed signal from an input port of the nth Josephson device to an output port of the nth Josephson device.

A superconductor fabrication system which when operated to fabricate a cascading selective microwave switch (cascade) performing operations comprising:

• fabricating a set of Josephson devices, each Josephson device in the set having a corresponding operating bandwidth of microwave frequencies, wherein different operating bandwidths have different corresponding center frequencies;
• and
• forming a series coupling between a first Josephson device from the set and an nth Josephson device from the set, wherein the series coupling causes the first Josephson device in an open state to reflect back to an input port of the first Josephson device a signal of a first frequency from a frequency multiplexed microwave signal (multiplexed signal) and the nth Josephson device in a closed state to transmit a signal of an nth frequency in the multiplexed signal from an input port of the nth Josephson device to an output port of the nth Josephson device.