Frequency multiplexed resonator input and/or output for a superconducting device

A superconducting input/output system comprising:

• a microwave transmission line;
• at least one microwave superconducting resonator communicatively coupled to the microwave transmission line, each microwave superconducting resonator respectively comprising:
• a capacitance coupled between the microwave transmission line and a first node via a superconductive path;
• an inductance coupled between the microwave transmission line and the first node via a superconductive path, the inductance in parallel with the capacitance of the respective microwave superconducting resonator;
• a first DC superconducting quantum interference device (SQUID) coupled between the inductance and the first node via a superconductive path, in parallel with the capacitance of the respective microwave superconducting resonator and in series with the inductance of the respective microwave superconducting resonator;
• and
• a second DC superconducting quantum interference device (SQUID) coupled between the first DC SQUID and the first node via a superconductive path, in parallel with the capacitance of the respective microwave superconducting resonator and in series with the inductance of the respective microwave superconducting resonator and in series with the first DC SQUID of the respective microwave superconducting resonator;
• a first interface inductively coupled to the first DC SQUID and selectively operable to apply a first flux bias to the first DC SQUID;
• and
• a second interface inductively coupled to the second DC SQUID and selectively operable to apply a second flux bias to the second DC SQUID, wherein the second DC SQUID is communicatively coupled to a Quantum Flux Parametron (QFP).