Superconducting parametric gyrators

A device, comprising:

• a parametric multipole bandpass filter circuit comprising:
• a first linear filter section coupled to a first input/output I/O port, a second linear filter section, and a third linear filter section coupled to a second I/O port;
• a first parametric coupling circuit which parametrically couples the first linear filter section and the second linear filter section;
• and
• a second parametric coupling circuit which parametrically couples the second linear filter section and the third linear filter section.

A device, comprising:

• a superconducting signal routing circuit comprising:
• a first hybrid coupler;
• a second hybrid coupler;
• a first parametric multipole bandpass filter circuit and a second multipole bandpass filter circuit coupled, in parallel, to and between the first hybrid coupler and the second hybrid coupler;
• wherein the first parametric multipole bandpass filter circuit comprises:
• a first linear filter section, a second linear filter section, and a third linear filter section;
• a first parametric coupling circuit which parametrically couples the first linear filter section and the second linear filter section;
• and
• a second parametric coupling circuit which parametrically couples the second linear filter section and the third linear filter section.