Quantum tuning via permanent magnetic flux elements

Patent metadata

Field	Value
Publication number	US-2023255123-A1
Application number	US-202318192524-A
Country	US
Kind code	A1
Filing date	Mar 29, 2023
Priority date	Mar 25, 2020
Publication date	Aug 10, 2023
Grant date	—

Abstract

Systems and techniques that facilitate quantum tuning via permanent magnetic flux elements are provided. In various embodiments, a system can comprise a qubit device. In various aspects, the system can further comprise a permanent magnet having a first magnetic flux, wherein an operational frequency of the qubit device is based on the first magnetic flux. In various instances, the system can further comprise an electromagnet having a second magnetic flux that tunes the first magnetic flux. In various cases, the permanent magnet can comprise a nanoparticle magnet. In various embodiments, the nanoparticle magnet can comprise manganese nanoparticles embedded in a silicon matrix. In various aspects, the system can further comprise an electrode that applies an electric current to the nanoparticle magnet in a presence of the second magnetic flux, thereby changing a strength of the first magnetic flux.

First claim

What is claimed is:

1 . A system, comprising:
a qubit device coupled to a first substrate; and a permanent magnet coupled to the first substrate and emitting a first magnetic flux onto the qubit device, wherein the first magnetic flux is tuned by exposing the permanent magnet to a second magnetic flux to cause an operational frequency of the qubit device to attain a predetermined value, and wherein the permanent magnet maintains the operational frequency of the qubit device at the predetermined value upon removal of the second magnetic flux.

2 . The system of claim 1 , further comprising:
an electrode that applies an electric current to the permanent magnet while the permanent magnet is exposed to the second magnetic flux to tune the first magnetic flux.

3 . The system of claim 1 , wherein tuning the first magnetic flux comprises changing a strength of the first magnetic flux to a predetermined strength corresponding to the predetermined value.

4 . The system of claim 1 , further comprising:
an electromagnet coupled to a second substrate and emitting the second magnetic flux on to the permanent magnet, wherein the first substrate is coupled to the second substrate, and wherein the first substrate and the second substrate comprise silicon or sapphire.

5 . The system of claim 4 , wherein the first substrate and the second substrate are bonded back-to-back to enable external electromagnetic interaction between the permanent magnet and the electromagnet.

6 . The system of claim 1 , wherein the operational frequency of the qubit device is a function of the first magnetic flux.

7 . The system of claim 1 , wherein the permanent magnet is a nanoparticle magnet comprising manganese nanoparticles embedded in a silicon matrix.

8 . The system of claim 1 , wherein the qubit device is a superconducting quantum interference device loop.

9 . A method, comprising:
emitting, via a permanent magnet coupled to a first substrate, a first magnetic flux onto a qubit device coupled to the first substrate, wherein the first magnetic flux is tuned by exposing the permanent magnet to a second magnetic flux to cause an operational frequency of the qubit device to attain a predetermined value, and wherein the permanent magnet maintains the operational frequency of the qubit device at the predetermined value upon removal of the second magnetic flux.

10 . The method of claim 9 , further comprising:
applying, via an electrode, an electric current to the permanent magnet while the permanent magnet is exposed to the second magnetic flux to tune the first magnetic flux.

11 . The method of claim 9 , wherein tuning the first magnetic flux comprises changing a strength of the first magnetic flux to a predetermined strength corresponding to the predetermined value.

12 . The method of claim 9 , further comprising:
emitting, via an electromagnet coupled to a second substrate, the second magnetic flux on to the permanent magnet, wherein the first substrate is coupled to the second substrate, and wherein the first substrate and the second substrate comprise silicon or sapphire.

13 . The method of claim 12 , wherein the first substrate and the second substrate are bonded back-to-back to enable external electromagnetic interaction between the permanent magnet and the electromagnet.

14 . The method of claim 9 , wherein the operational frequency of the qubit device is a function of the first magnetic flux.

15 . The method of claim 9 , wherein the permanent magnet is a nanoparticle magnet comprising manganese nanoparticles embedded in a silicon matrix.

16 . The method of claim 9 , wherein the qubit device is a superconducting quantum interference device loop.

17 . A method, comprising:
emitting, via a permanent magnet coupled to a first substrate, a first magnetic flux onto a qubit device coupled to a second substrate, wherein the first magnetic flux is tuned by exposing the permanent magnet to a second magnetic flux to cause an operational frequency of the qubit device to attain a predetermined value, and wherein the permanent magnet maintains the operational frequency of the qubit device at the predetermined value upon removal of the second magnetic flux.

18 . The method of claim 17 , further comprising:
emitting, via an electromagnet coupled to the second substrate, the second magnetic flux on to the permanent magnet.

19 . The method of claim 18 , wherein the permanent magnet and the electromagnet are fabricated in different chip-planes of the second substrate.

20 . The method of claim 17 , wherein the second substrate is bonded above the first substrate using an air bridge gap, and wherein the first substrate and the second substrate comprise silicon or sapphire.

Assignees

• IBM

Inventors

• Holmes Steven J
• Sadana Devendra K
• Mckay David C
• Hertzberg Jared Barney
• Bedell Stephen W
• Li Ning

Classifications

• H10D48/383

  Quantum effect devices, e.g. of devices using quantum reflection, diffraction or interference effects · CPC title

• G01R33/0358 Primary

  coupling the flux to the SQUID (gradiometer coils G01R33/022; coils with superconductive winding H01F6/06) · CPC title

• H10N60/805 Primary

  for Josephson-effect devices · CPC title

• G06N10/00

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

• H01L29/66977

  Electricity · mapped topic