Isolator based on nondegenerate three-wave mixing Josephson devices
View Patent ↗A technique relates to a superconducting device. A gyrator includes a first mixing device coupled to a second mixing device. A lumped-element resistor is connected in parallel to the gyrator.
1. A superconducting device comprising:
a gyrator including a first mixing device coupled to a second mixing device; and
a lumped-element resistor connected in parallel to the gyrator.
2. The superconducting device of claim 1 , wherein the first mixing device is coupled to the second mixing device via a delay line.
3. The superconducting device of claim 2 , wherein the delay line is configured to cause a predefined phase shift.
4. The superconducting device of claim 3 , wherein the predefined phase shift adds 90 degrees.
5. The superconducting device of claim 1 , wherein the first mixing device coupled to the second mixing device is configured to cause a non-reciprocal phase shift.
6. The superconducting device of claim 1 , wherein the first mixing device coupled to the second mixing device is configured to cause a first predefined phase shift in a first direction and a second predefined phase shift in a second direction.
7. The superconducting device of claim 6 , wherein the first predefined phase shift is 0 degrees.
8. The superconducting device of claim 6 , wherein the second predefined phase shift is 180 degrees.
9. The superconducting device of claim 1 , wherein the first and second mixing devices are superconducting three-wave mixing devices.
10. The superconducting device of claim 1 , wherein the gyrator and the lumped-element resistor form a superconducting isolator.
11. A superconducting device comprising:
a first mixing device having a first mixing port and a second mixing port;
a second mixing device having another first mixing port and another second mixing port, the first and second mixing devices being superconducting three-wave mixing devices, wherein the second mixing port and the another second mixing port are coupled together via a delay line to form a gyrator; and
a lumped-element resistor coupled in parallel to the gyrator.
12. The superconducting device of claim 11 , wherein the first mixing device is configured to perform a first frequency conversion and the second mixing device is configured to perform a second frequency conversion such that a combination of the first and second frequency conversions negate one another, thereby transmitting a signal without a frequency change.
13. The superconducting device of claim 11 , wherein the first mixing port and the another first mixing port are signal ports, and the second mixing port and the another second mixing port are idler ports.