ARCHITECTURE FOR COUPLING QUANTUM BITS USING LOCALIZED RESONATORS

• US 20170062692A1
• Filed: 11/23/2015
• Published: 03/02/2017
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Dial, Oliver, Gambetta, Jay M., McClure, Douglas T. III, Steffen, Matthias
• Granted Patent: US 10,283,696 B2
• Time in Patent Office: Days
• 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: G06N 20/00 Machine learning
• CPC Class Codes: H01P 1/205 Comb or interdigital filters; Cascaded coaxial cavities H01P1/203 takes precedence
• CPC Class Codes: H01P 7/00 Resonators of the waveguide type
• CPC Class Codes: H05K 999/99 dummy group
• CPC Class Codes: H10N 60/01 Manufacture or treatment
• CPC Class Codes: H10N 60/0912 of Josephson-effect devices
• CPC Class Codes: H10N 60/20 Permanent superconducting devices
• CPC Class Codes: H10N 60/805 for Josephson-effect devices

Abstract

A technique relates a superconducting microwave cavity. An array of posts has different heights in the cavity, and the array supports a localized microwave mode. The array of posts includes lower resonant frequency posts and higher resonant frequency posts. The higher resonant frequency posts are arranged around the lower resonant frequency posts. A first plate is opposite a second plate in the cavity. One end of the lower resonant frequency posts is positioned on the second plate so as to be electrically connected to the second plate. Another end of the lower resonant frequency posts in the array is open so as not to form an electrical connection to the first plate. Qubits are connected to the lower resonant frequency posts in the array of posts, such that each of the qubits is physically connected to one or two of the lower resonant frequency posts in the array of posts.

Claims

1. A method of configuring a superconducting microwave cavity, the method comprising:

providing an array of posts of different heights, the array of posts each supporting a localized microwave mode, wherein the array of posts includes lower resonant frequency posts and higher resonant frequency posts, the higher resonant frequency posts arranged around the lower resonant frequency posts;

configuring a first plate opposite a second plate;

positioning one end of the lower resonant frequency posts in the array of posts on the second plate so as to be electrically connected to the second plate;

positioning another end of the lower resonant frequency posts in the array of posts to be open so as not to form an electrical connection to the first plate; and

connecting qubits to the lower resonant frequency posts in the array of posts, such that each of the qubits is physically connected to one or two of the lower resonant frequency posts in the array of posts.

2. The method of claim 1, wherein the first plate includes ports respectively above the lower resonant frequency posts in the array of posts, the ports being configured to couple to, drive, and measure the qubits.

3. The method of claim 1, wherein the higher resonant frequency posts are shorted on both ends, such that a first end of the higher resonant frequency posts is shorted to the first plate and a second end is shorted to the second plate.

4. The method of claim 1, wherein the higher resonant frequency posts are configured to provide mode localization for the lower resonant frequency posts in the array of posts.

5. The method of claim 1, wherein the qubits are at least one of superconducting qubits, semiconductor spin qubits, optically trapped ions, and an impurity center in a crystal.

6. The method of claim 1, wherein the qubits are of different types on a same lattice.