公开(公告)号：US11569205B2

公开(公告)日：2023-01-31

申请号：US17228393

申请日：2021-04-12

Applicant: Google LLC

Inventor： Theodore Charles White

IPC: H01L21/02 ,  H01L25/065 ,  G06N10/00 ,  H01L27/18 ,  H01L23/48 ,  H01L23/532 ,  H01L23/66 ,  H01L23/00 ,  H01L25/00 ,  H01P7/08

Abstract: A device includes: a first chip including a qubit; and a second chip bonded to the first chip, the second chip including a substrate including first and second opposing surfaces, the first surface facing the first chip, wherein the second chip includes a single layer of superconductor material on the first surface of the substrate, the single layer of superconductor material including a first circuit element. The second chip further includes a second layer on the second surface of the substrate, the second layer including a second circuit element. The second chip further includes a through connector that extends from the first surface of the substrate to the second surface of the substrate and electrically connects a portion of the single layer of superconducting material to the second circuit element.

公开(公告)号：US20220311400A1

公开(公告)日：2022-09-29

申请号：US17632923

申请日：2020-08-03

Applicant: Google LLC

Inventor： Theodore Charles White ,  Anthony Edward Megrant

IPC: H03F7/00 ,  H03F19/00 ,  H01L27/18 ,  H01L39/24

Abstract: A parametric traveling wave amplifier (200) is disclosed in which the amplifiers include: a co-planar waveguide, in which the co-planar waveguide includes at least one Josephson junction (210) interrupting a center trace (204) of the co-planar waveguide; and at least one shunt capacitor coupled to the co-planar waveguide, in which each shunt capacitor of the at least one shunt capacitor includes a corresponding superconductor trace (214) extending over an upper surface of the center trace of the co-planar waveguide, and in which a gap separates the superconductor trace from the upper surface of the center trace, and in which the co-planar waveguide including the at least one Josephson junction and the shunt capacitor establish a predefined overall impedance for the traveling wave parametric amplifier.

公开(公告)号：US11411159B1

公开(公告)日：2022-08-09

申请号：US17104826

申请日：2020-11-25

Applicant: Google LLC

Inventor： Theodore Charles White ,  John Martinis

IPC: H05K1/02 ,  H01L39/02 ,  H01L39/04 ,  H03F19/00 ,  H01P1/383 ,  H01L39/22 ,  G06N10/00 ,  H01P5/18 ,  B82Y10/00

Abstract: An integrated qubit readout circuit is presented, which includes a superconducting parametric amplifier, a circuit board arranged to mount the superconducting parametric amplifier, a circulator mounted on the circuit board and connected to the superconducting parametric amplifier, wherein the circulator comprises a termination port electrically connected to a termination resistor arranged to terminate a pump tone received by the superconducting parametric amplifier, and wherein the termination resistor is mounted on the circuit board.

公开(公告)号：US20210336121A1

公开(公告)日：2021-10-28

申请号：US16964053

申请日：2019-07-25

Applicant: Google LLC

Inventor： Brian James Burkett ,  Ofer Naaman ,  Anthony Edward Megrant ,  Theodore Charles White

IPC: H01L39/24 ,  H01L39/02 ,  H01L39/22 ,  G06N10/00

Abstract: Methods, systems and apparatus for forming Josephson junctions with reduced stray inductance. In one aspect, a device includes a substrate; a first superconductor layer on the substrate; an insulator layer on the first superconductor layer; a second superconductor layer on the insulator layer, wherein the first superconductor layer, the insulator layer, and the second superconductor layer form a superconductor tunnel junction; and a third superconductor layer directly on a surface of the first superconductor layer and directly on a surface of the second superconductor layer to provide a first contact to the superconducting tunnel junction and a second contact to the superconductor tunnel junction, respectively.