Removal of spurious microwave modes via flip-chip crossover

• US 9,219,298 B2
• Filed: 03/15/2013
• Issued: 12/22/2015
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Abraham, David W., Chow, Jerry M., Corcoles Gonzalez, Antonio D., Keefe, George A., Rothwell, Mary E., Rozen, James R., Steffen, Matthias
• Primary Examiner(s): Diallo, Mamadou
• Assistant Examiner(s): Chang, Jay C
• Application Number:
  US13/838,324
• Publication Number:
  US 20140264287A1
• Time in Patent Office: 1,012 Days
• Field of Search: None
• US Class Current: 1/1
• 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: H01P 11/003 Manufacturing lines with conductors on a substrate, e.g. strip lines, slot lines
• CPC Class Codes: H01P 3/003 Coplanar lines
• CPC Class Codes: H01P 3/026 Coplanar striplines [CPS]
• CPC Class Codes: H01P 7/086 Coplanar waveguide resonators H01P7/088 takes precedence
• CPC Class Codes: H10N 60/0156 of devices comprising Nb or an alloy of Nb with one or more of the elements of group 4, e.g. Ti, Zr, Hf
• CPC Class Codes: H10N 60/12 Josephson-effect devices
• CPC Class Codes: H10N 60/20 Permanent superconducting devices
• CPC Class Codes: H10N 60/815 for Josephson-effect devices

Abstract

A coplanar waveguide device includes a coplanar waveguide structure disposed on a substrate, at least one qubit coupled to the coplanar waveguide structure and an add-on chip having a metallized trench, and disposed over the substrate.

Claims

1. A coplanar waveguide (CPW) device, comprising:

a first chip including a patterned CPW; and

a second chip disposed on the first chip, the second chip having a metallized trench that removes spurious microwave modes from the first chip;

wherein the second chip is configured as a cap over the first chip, the second chip further comprising a first surface and a second surface opposite the first surface such that the first surface includes the metallized trench, and the second surface includes a control signal line that passes through a thickness of the second chip and extends between an opening in the metallized trench so as to provide a control signal to the patterned CPW.

2. The device as claimed in claim 1 wherein the patterned CPW is disposed on a substrate.

3. The device as claimed in claim 2 further comprising at least one qubit coupled to the patterned CPW.

4. The device as claimed in claim 2 wherein the patterned CPW comprises:

a resonator;

a drive pad coupled to the resonator; and

a qubit pocket coupled to the resonator.

5. The device as claimed in claim 4 further comprising a qubit disposed in the qubit pocket.

6. The device as claimed in claim 5 wherein the drive pad is configured to drive the qubit at a pre-defined frequency.

7. The device as claimed in claim 3 wherein the patterned CPW supports a pre-defined drive frequency for the qubit.

8. The device as claimed in claim 7 wherein the patterned CPW supports spurious microwave modes.

9. The device as claimed in claim 8 wherein the metallized trench is configured to remove the spurious microwave modes.