Superconductor devices having buried quasiparticle traps

Patent metadata

Field	Value
Publication number	US-11515461-B2
Application number	US-201916728504-A
Country	US
Kind code	B2
Filing date	Dec 27, 2019
Priority date	Dec 27, 2019
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

Techniques for trapping quasiparticles in superconductor devices are provided. A superconductor device can comprise a substrate layer. The superconductor device can further comprise a first superconductor layer composed of a first superconductor material, on a first surface of a substrate layer. The superconductor device can further comprise a trapping material buried in the first superconductor layer, wherein the trapping material is formulated to trap quasiparticles.

First claim

What is claimed is:

1. A superconductor device, comprising:
a substrate layer;
a first superconductor layer composed of a first superconductor material, on a first surface of the substrate layer; and
a trapping material buried in the first superconductor layer, wherein the trapping material is formulated to trap quasiparticles.

2. The superconductor device of claim 1 , wherein the trapping material is buried within the first superconductor layer at a distance away from a surface of the superconductor material which exceeds a depth to which a magnetic field penetrates the superconductor material of the first superconductor layer.

3. The superconductor device of claim 1 , further comprising a second superconductor layer on a second surface of the first superconductor layer opposite to the first surface of the substrate layer, wherein the second superconductor layer contacts the trapping material.

4. The superconductor device of claim 3 , wherein the second superconductor layer is composed of second superconductor material that is different from the first superconductor material.

5. The superconductor device of claim 3 , wherein the second superconductor layer has a thickness exceeding a depth to which a magnetic field penetrates the superconductor material of which the first superconductor layer is comprised.

6. A method, comprising:
depositing a first superconductor layer on a first surface of a substrate material; and
burying a trapping material in the first superconductor layer, wherein the trapping material is formulated to trap quasiparticles.

7. The method of claim 6 , wherein the burying the trapping material comprises:
depositing the trapping material in a recess formed in a second surface of the first superconductor layer opposite to the first surface of the substrate material; and
depositing a second superconductor layer on the second surface of the first superconductor layer, wherein the depositing of the second superconductor layer covers the recess and embeds the trapping material in the combined first superconductor layer and the second superconductor layer.

8. The method of claim 7 , wherein the depositing of the trapping material in the recess comprises:
depositing the trapping material on the second surface of the first superconductor layer, such that the recess is filled with the trapping material and excess trapping material forms an excess material layer over the second surface of the first superconductor layer; and
removing the excess material layer.

9. The method of claim 7 , wherein the depositing of the trapping material in the recess comprises depositing the trapping material in the recess without forming an excess material layer over the second surface of the first superconductor layer.

10. A method, comprising:
providing a superconductor material;
providing a trapping material that is formulated to trap quasiparticles; and
combining, on a substrate material, the superconductor material with the trapping material, wherein the trapping material is combined so as to be buried within the superconductor material.

11. The method of claim 10 , wherein the providing of the trapping material comprises discretely providing one or more pieces of the trapping material to facilitate the combining such that the trapping material is buried within the superconductor material.

12. The method of claim 11 , wherein pieces of the buried trapping material pieces are spaced apart at a defined interval from one other.

13. The method of claim 11 , wherein at least two of the pieces of the buried trapping material are formed to have the same shape.

14. The method of claim 13 , wherein the same shape is a rounded shape.

15. The method of claim 13 , wherein the same shape is a non-rounded shape.

16. The method of claim 11 , wherein the buried trapping material pieces are formed along a ground plane of the superconductor material.

17. The method of claim 10 , wherein the trapping material is comprised of a metallic material.

18. The method of claim 10 , wherein the trapping material is combined so as to be buried within the superconductor material exceeding a depth to which a magnetic field penetrates the superconductor material.

19. The method of claim 10 , wherein a first surface of the buried trapping material is formed to be separated from a second surface of the substrate material.

20. The method of claim 19 , wherein the second surface of the substrate material is in contact with the superconductor material.

Assignees

• IBM

Inventors

• Abdo Baleegh
• Bangsaruntip Sarunya

Classifications

• G06N10/40

  Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control · CPC title

• G06N10/00

  Quantum computing, i.e. information processing based on quantum-mechanical phenomena · CPC title

• H01L39/2461 Primary

  Electricity · mapped topic

• H10N60/0632 Primary

  Intermediate layers, e.g. for growth control · CPC title

• H10N60/85

  Superconducting active materials · CPC title