Superconducting field-programmable gate array
The various embodiments described herein include methods, devices, and systems for operating superconducting circuitry. In one aspect, a programmable circuit includes: (1) a superconducting component arranged in a multi-dimensional array of alternating narrow and wide portions, the superconducting component having an input terminal at a first end and an output terminal at a second end opposite of the first end; and (2) control circuitry coupled to the narrow portions of the superconducting component, the control circuitry configured to transition the narrow portions between superconducting and non-superconducting states. In some implementations, the superconducting component and the control circuitry are formed on different layers of the programmable circuit.
1. A programmable circuit, comprising:
a superconducting component arranged in a multi-dimensional array of alternating narrow and wide portions, the superconducting component having an input terminal and an output terminal;
an electrical source coupled to the input terminal;
a readout circuit coupled to the output terminal; and
control circuitry coupled to respective narrow portions of the multi-dimensional array of alternating narrow and wide portions, the control circuitry configured to:
operate the superconducting component in a first programmed state by maintaining a first subset of the narrow portions in a non-superconducting state; and
operate the superconducting component in a second programmed state, distinct from the first programmed state, by maintaining a second subset of the narrow portions in the non-superconducting state.
2. The programmable circuit of claim 1 , wherein operating the superconducting component in the first programmed state comprises operating the superconducting component as a current amplifier.
3. The programmable circuit of claim 1 , wherein operating the superconducting component in the first programmed state comprises operating the superconducting component as an analog-to-digital converter.
4. The programmable circuit of claim 1 , wherein operating the superconducting component in the first programmed state comprises operating the superconducting component as a capacitor.
5. The programmable circuit of claim 1 , wherein operating the superconducting component in the first programmed state comprises operating the superconducting component as an inductor with a first inductance value.
6. The programmable circuit of claim 5 , wherein operating the superconducting component in the second programmed state comprises operating the superconducting component as the inductor with a second inductance value.
7. The programmable circuit of claim 1 , wherein the first programmed state has a first associated capacitance value, and the second programmed state has a second associated capacitance value, different than the first associated capacitance value.
8. The programmable circuit of claim 1 , wherein the control circuitry comprises a plurality of resistors.
9. The programmable circuit of claim 8 , wherein each resistor of the plurality of resistors has a distinct resistance value.
10. The programmable circuit of claim 1 , wherein the control circuitry is configured to selectively transition subsets of the narrow portions between a superconducting state and the non-superconducting state.
11. The programmable circuit of claim 10 , wherein the non-superconducting state comprises an insulating state.
12. The programmable circuit of claim 1 , wherein the control circuitry is electrically-isolated from the superconducting component.
13. The programmable circuit of claim 1 , wherein the control circuitry is configured to selectively adjust capacitance, inductance, and/or resistance of the superconducting component.
14. The programmable circuit of claim 1 , wherein the input terminal is coupled to the output terminal via a set of the narrow portions coupled to one another in a series configuration.
15. The programmable circuit of claim 1 , wherein the respective narrow portions consist of less than all narrow portions of the multi-dimensional array of alternating narrow and wide portions.