Back to results
US 10,949,769 B2Granted
Co-planar waveguide flux qubits
AssigneeGoogle Inc.
InventorsYu Chen, John Martinis, Daniel Thomas Sank, Alireza Shabani Barzegar
Life of this patent
Estimating the term…
Abstract
A qubit device includes an elongated thin film uninterrupted by Josephson junctions, a quantum device in electrical contact with a proximal end of the elongated thin film, and a ground plane that is co-planar with the elongated thin film and is in electrical contact with a distal end of the elongated thin film, in which the thin film, the quantum device, and the ground plane comprise a material that is superconducting at a designed operating temperature.
Claims13
A qubit device comprising:
- an elongated thin film uninterrupted by Josephson junctions;
- a superconducting quantum interference device (SQUID) in direct electrical contact with a proximal end of the elongated thin film, wherein the SQUID comprises less than three Josephson junctions;
- and
- a ground plane that is co-planar with the elongated thin film and is in direct electrical contact with a distal end of the elongated thin film;
- wherein the elongated thin film, the SQUID and the ground plane comprise a superconductor material,
- wherein the elongated thin film comprises a first side and a second opposite side and wherein each of the first side and the second side is separated from the ground plane by a respective gap.
3 more elements
A qubit control system comprising:
- a qubit comprising an elongated co-planar waveguide and a superconducting quantum interference device (SQUID), wherein a first end of the elongated co-planar waveguide is in direct electrical contact with the SQUID and a second end of the elongated co-planar waveguide is in direct electrical contact with a ground plane;
- a first bias control device arranged to electromagnetically couple to the elongated co- planar waveguide during operation of the qubit control system;
- and
- a second bias control device arranged adjacent to the SQUID to electromagnetically couple to the SQUID,
- wherein the elongated co-planar waveguide comprises an elongated thin film uninterrupted by Josephson junctions, wherein each of a first side of the elongated thin film and a second side of the elongated thin film is separated from the ground plane by a respective gap, wherein the first side of the elongated thin film is opposite to that of the second side of the elongated thin film.
2 more elements
An apparatus comprising:
- a plurality of qubits, each qubit of the plurality of qubits comprising a corresponding elongated co-planar waveguide and a corresponding superconducting quantum interference device (SQUID), wherein, for each qubit, a first end of the corresponding elongated co-planar waveguide of the qubit is in direct electrical contact with the corresponding SQUID of the qubit, and a second end of the corresponding elongated co-planar waveguide of the qubit is in direct electrical contact with a ground plane,
- wherein each qubit is operatively coupled to at least one other qubit of the plurality of qubits, and
- wherein the corresponding co-planar waveguide of each qubit crosses over the corresponding co-planar waveguide of at least one other qubit of the plurality of qubits at a corresponding waveguide crossing location.
Dependencies are inferred from the claim text.