Extra-substrate control system

• US 20030193097A1
• Filed: 04/26/2002
• Published: 10/16/2003
• Est. Priority Date: 04/15/2002
• Status: Active Grant

• Current Assignee: D-Wave Systems Inc. (D-Wave Quantum, Inc.)
• Original Assignee: D-Wave Systems Inc. (D-Wave Quantum, Inc.)
• Inventors: Steininger, Miles F.H., Ilʼichev, Evgeni
• Granted Patent: US 6,911,664 B2
• Time in Patent Office: Days
• US Class Current: 257/77
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: G06N 10/00 Quantum computing, i.e. information processing based on quantum-mechanical phenomena
• CPC Class Codes: H10N 69/00 Integrated devices, or assemblies of multiple devices, comprising at least one superconducting element covered by group H10N60/00
• CPC Class Codes: Y10S 977/933 Spintronics or quantum computing

Abstract

The present invention generally involves an extra-substrate control system comprising a first substrate, attached to which is at least one superconducting structure, and a second substrate, connected to which is at least one element of circuitry, wherein the superconducting structure and the circuitry interact, so that a change in a state of the superconducting structure can be detected by the circuitry. The present invention also provides a quantum computing apparatus comprising a first substrate, attached to which is one or more layers of material, at least one of which is a superconducting material, a second substrate, deposited on which is a flux shield and on the flux shield is at least one element of circuitry, wherein the superconducting material and the second substrate are separated by a mean distance that is small enough to permit coupling between the element of circuitry and the superconducting material.

Claims

1. A quantum computing apparatus comprising:

a first substrate, attached to which is a layer of superconducting material;

a second substrate, deposited on which is a flux shield and on the flux shield is at least one element of circuitry;

wherein the superconducting material and the second substrate are separated by a mean distance that is small enough to permit coupling between the element of circuitry and the superconducting material.

2. An extra-substrate control system comprising:

a first substrate, attached to which is at least one superconducting structure; and

a second substrate, connected to which is at least one element of circuitry;

wherein the superconducting structure and the circuitry are configured to interact by inductive or capacitive coupling, so that a change in a state of the superconducting structure can be detected by the circuitry.

3. The extra-substrate control system of claim 2 further comprising a mechanism for controlling the interaction of the element of circuitry with other devices.

4. The extra-substrate control system of claim 2, additionally comprising, attached to the second substrate, a plurality of elements of integrated circuitry.

5. The extra-substrate control system of claim 2, wherein the element of circuitry is patterned on to the second substrate.

6. The extra-substrate control system of claim 2 wherein the coupling is capacitive.

7. The extra-substrate control system of claim 2 wherein the coupling is inductive.

8. The extra-substrate control system of claim 2 further comprising a flux shield between the second substrate, and the element of circuitry.

9. The extra-substrate control system of claim 8 wherein the flux shield is made from a superconducting material.

10. The extra-substrate control system of claim 8 wherein the flux shield is made from a composite of non-superconducting materials.

11. The extra-substrate control system of claim 9 wherein the superconducting material comprises a Type I superconducting material.

12. The extra-substrate control system of claim 9 wherein the superconducting material comprises niobium.

13. The extra-substrate control system of claim 8 wherein the flux shield contains an aperture.

14. The extra-substrate control system of claim 13 wherein the flux shield additionally comprises a weak link that connects the aperture with the edge of the shield.

15. The extra-substrate control system of claim 13 wherein the flux shield additionally comprises a slit that connects the aperture with the edge of the shield.

16. The extra-substrate control system of claim 2 wherein the superconducting structure comprises a qubit.

17. The extra-substrate control system of claim 16 wherein the qubit is a phase qubit.

18. The extra-substrate control system of claim 16 wherein the qubit is a charge qubit.

19. The extra-substrate control system of claim 16 wherein the qubit comprises a Josephson junction.

20. The extra-substrate control system of claim 13 wherein the aperture is aligned with a qubit.

21. The extra-substrate control system of claim 8 wherein the flux shield comprises a plurality of apertures.

22. The extra-substrate control system of claim 2 wherein the first substrate and the second substrate are together a single substrate.

23. A quantum computing apparatus comprising:

a first substrate, deposited on which is a superconducting structure, additionally deposited on which is a flux shield and on the flux shield is at least one element of circuitry;

wherein the superconducting structure and the element of circuitry are coupled by the flux shield.

24. The quantum computing apparatus of claim 23 wherein the flux shield contains an aperture.

25. The quantum computing apparatus of claim 24 wherein the flux shield additionally comprises a weak link that connects the aperture with the edge of the shield.

26. The quantum computing apparatus of claim 24 wherein the flux shield additionally comprises a slit that connects the aperture with the edge of the shield.

27. The quantum computing apparatus of claim 23 wherein the superconducting structure includes a qubit.

28. The quantum computing apparatus of claim 23 wherein the element of circuitry includes a resonance circuit.