Mechanically tunable superconducting qubit
A system for adjusting qubit frequency includes a qubit device having a Josephson junction and a shunt capacitor coupled to electrodes of the Josephson junction. A cantilevered conductor is separated from the shunt capacitor by a spacing. An adjustment mechanism is configured to deflect the cantilevered conductor to tune a qubit frequency for the qubit device.
1. A system for adjusting qubit frequency, comprising:
a qubit device; and
an adjustable shunt capacitance of the qubit device to tune a qubit frequency.
2. The system as recited in claim 1 , wherein the adjustable shunt capacitance is referenced to ground.
3. The system as recited in claim 1 , wherein the adjustable shunt capacitance is tuned by a cantilevered conductor which deflects to tune the qubit frequency for the qubit device.
4. The system as recited in claim 3 , wherein the cantilevered conductor includes a metal or a metal coated polymeric material.
5. The system as recited in claim 3 , wherein the cantilevered conductor includes a plurality of cantilevered conductors configured to be spaced apart from different portions of the shunt capacitance.
6. The system as recited in claim 3 , wherein the adjustable shunt capacitance includes pads and the cantilevered conductor is disposed over one or more of the pads.
7. The system as recited in claim 1 , wherein the adjustable shunt capacitance is tuned by an adjustable mechanical device.
8. The system as recited in claim 1 , wherein the adjustable shunt capacitance is tuned by an electrical adjustment device.
9. A system for adjusting qubit frequency, comprising:
a qubit device;
an adjustable shunt capacitance of the qubit device to tune a qubit frequency; and
a housing at least partially encapsulating the qubit device.
10. The system as recited in claim 9 , wherein the adjustable shunt capacitance is tuned by a cantilevered conductor which deflects to tune the qubit frequency for the qubit device.
11. The system as recited in claim 10 , wherein the adjustable shunt capacitance includes pads and the cantilevered conductor is disposed over one or more of the pads.
12. The system as recited in claim 9 , wherein the adjustable shunt capacitance is tuned by an adjustable mechanical device.
13. The system as recited in claim 9 , wherein the adjustable shunt capacitance is tuned by an electrical adjustment device.
14. The system as recited in claim 13 , wherein the electrical adjustment device includes capacitive plates, wherein one plate is fixed to the housing and another is disposed on a cantilevered conductor.
15. The system as recited in claim 14 , wherein the cantilevered conductor includes a metal or a metal coated polymeric material.
16. The system as recited in claim 14 , wherein the cantilevered conductor includes a plurality of cantilevered conductors configured to be spaced apart from different portions of the shunt capacitance.
17. A method for adjusting qubit frequency, comprising:
adjusting a space between a conductor and a shunt capacitor of a qubit device; and
verifying a qubit frequency of the qubit device.
18. The method as recited in claim 17 , further comprising repeating the adjusting until a verification is achieved.
19. The method as recited in claim 17 , wherein adjusting the space includes adjusting a mechanical adjustment to tune the qubit frequency.
20. The method as recited in claim 17 , wherein adjusting the space includes adjusting an electrical adjustment to tune the qubit frequency.