公开(公告)号：US20250068959A1

公开(公告)日：2025-02-27

申请号：US18941942

申请日：2024-11-08

Applicant: Google LLC

Inventor： Kevin Chenghao Miao ,  Alexander Korotkov ,  Matthew James McEwen ,  Rami Barends

IPC: G06N10/70 ,  G06N10/40

Abstract: Methods, systems and apparatus for resetting a qubit. In one aspect, an apparatus includes a qubit, wherein the state of the qubit occupies a plurality of levels comprising two computational levels and one or more non-computational levels; a resonator that operates at a resonator frequency; control electronics that control a frequency of the qubit such that during a reset operation the qubit frequency is adjusted from a holding frequency that is lower than the resonator frequency to an idling frequency that is higher than the resonator frequency, and during the adjustment a first derivative of the qubit frequency at a first time is positive, at a second time that occurs after the first time is zero, and at a third time that occurs after the second time is positive, where the qubit frequency achieves the idling frequency at a fourth time that occurs after the third time.

公开(公告)号：US20240346359A1

公开(公告)日：2024-10-17

申请号：US18753916

申请日：2024-06-25

Applicant: Google LLC

Inventor： John Martinis ,  Austin Greig Fowler ,  Rami Barends

IPC: G06N10/70 ,  G06F15/80 ,  G06N10/00 ,  G06N10/20

CPC classification number: G06N10/70 ,  G06F15/80 ,  G06N10/00 ,  G06N10/20

Abstract: Methods, systems, and apparatus for operating a system of qubits. In one aspect, a method includes operating a first qubit from a first plurality of qubits at a first qubit frequency from a first qubit frequency region, and operating a second qubit from the first plurality of qubits at a second qubit frequency from a second first qubit frequency region, the second qubit frequency and the second first qubit frequency region being different to the first qubit frequency and the first qubit frequency region, respectively, wherein the second qubit is diagonal to the first qubit in a two-dimensional grid of qubits.

公开(公告)号：US12069969B2

公开(公告)日：2024-08-20

申请号：US18139288

申请日：2023-04-25

Applicant: Google LLC

Inventor： Rami Barends

IPC: H10N69/00 ,  G06N10/00 ,  H01P3/00 ,  H10N60/12 ,  H10N60/85

CPC classification number: H10N69/00 ,  G06N10/00 ,  H01P3/003 ,  H10N60/12 ,  H10N60/855

Abstract: A system that includes: an array of qubits, each qubit of the array of qubits comprising a first electrode corresponding to a first node and a second electrode corresponding to a second node, wherein, for a first qubit in the array of qubits, the first qubit is positioned relative to a second qubit in the array of qubits such that a charge present on the first qubit induces a same charge on each of the first node of the second qubit and the second node of the second qubit, such that coupling between the first qubit and the second qubit is reduced, and wherein none of the nodes share a common ground is disclosed.

公开(公告)号：US12056575B2

公开(公告)日：2024-08-06

申请号：US18238944

申请日：2023-08-28

Applicant: Google LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: G06N10/00 ,  H03K19/177

CPC classification number: G06N10/00 ,  H03K19/177

Abstract: Methods and systems for performing a surface code error detection cycle. In one aspect, a method includes initializing and applying Hadamard gates to multiple measurement qubits; performing entangling operations on a first set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a first direction; performing entangling operations on a second set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a second or third direction, the second and third direction being perpendicular to the first direction, the second direction being opposite to the third direction; performing entangling operations on a third set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a fourth direction, the fourth direction being opposite to the first direction; applying Hadamard gates to the measurement qubits; and measuring the measurement qubits.

公开(公告)号：US12008435B2

公开(公告)日：2024-06-11

申请号：US17694820

申请日：2022-03-15

Applicant: Google LLC

Inventor： Alexander Nikolaevich Korotkov ,  Kevin Joseph Satzinger ,  Matthew James McEwen ,  Vadim Smelyanskiy ,  Paul Victor Klimov ,  Rami Barends ,  Julian Shaw Kelly ,  Juan Carlos Atalaya-Chavez ,  Zijun Chen

IPC: G06N10/70 ,  G06N10/40

CPC classification number: G06N10/40

Abstract: A quantum computing system configured for removal of leakage states can include quantum hardware including a first qubit and a second qubit, wherein the first qubit is configured to have a first transition frequency and wherein the second qubit is configured to have a second transition frequency, the first transition frequency being greater than the second transition frequency. The quantum computing system can include one or more quantum control devices configured to control operation of at least the first qubit and the second qubit, wherein the one or more quantum control devices are configured to implement a quantum gate operation on the first qubit and the second qubit based at least in part on the first transition frequency and the second transition frequency, and wherein the one or more quantum control devices are configured to periodically reset a quantum state of the first qubit.

公开(公告)号：US20240062086A1

公开(公告)日：2024-02-22

申请号：US18238944

申请日：2023-08-28

Applicant: Google LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: G06N10/00 ,  H03K19/177

CPC classification number: G06N10/00 ,  H03K19/177

Abstract: Methods and systems for performing a surface code error detection cycle. In one aspect, a method includes initializing and applying Hadamard gates to multiple measurement qubits; performing entangling operations on a first set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a first direction; performing entangling operations on a second set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a second or third direction, the second and third direction being perpendicular to the first direction, the second direction being opposite to the third direction; performing entangling operations on a third set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a fourth direction, the fourth direction being opposite to the first direction; applying Hadamard gates to the measurement qubits; and measuring the measurement qubits.

公开(公告)号：US11672188B2

公开(公告)日：2023-06-06

申请号：US16977673

申请日：2018-03-26

Applicant: Google LLC

Inventor： Rami Barends

IPC: G06N10/00 ,  H01L27/18 ,  H01L39/12 ,  H01L39/22 ,  H01P3/00

CPC classification number: H01L27/18 ,  G06N10/00 ,  H01L39/125 ,  H01L39/223 ,  H01P3/003

Abstract: A system that includes: an array of qubits, each qubit of the array of qubits comprising a first electrode corresponding to a first node and a second electrode corresponding to a second node, wherein, for a first qubit in the array of qubits, the first qubit is positioned relative to a second qubit in the array of qubits such that a charge present on the first qubit induces a same charge on each of the first node of the second qubit and the second node of the second qubit, such that coupling between the first qubit and the second qubit is reduced, and wherein none of the nodes share a common ground is disclosed.

公开(公告)号：US20230169380A1

公开(公告)日：2023-06-01

申请号：US18095803

申请日：2023-01-11

Applicant: Google LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: G06N10/00 ,  H03K19/177

CPC classification number: G06N10/00 ,  H03K19/177

Abstract: Methods and systems for performing a surface code error detection cycle. In one aspect, a method includes initializing and applying Hadamard gates to multiple measurement qubits; performing entangling operations on a first set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a first direction; performing entangling operations on a second set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a second or third direction, the second and third direction being perpendicular to the first direction, the second direction being opposite to the third direction; performing entangling operations on a third set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a fourth direction, the fourth direction being opposite to the first direction; applying Hadamard gates to the measurement qubits; and measuring the measurement qubits.

公开(公告)号：US11662664B2

公开(公告)日：2023-05-30

申请号：US17856564

申请日：2022-07-01

Applicant: Google LLC

Inventor： Brian James Burkett ,  Rami Barends

IPC: G03F7/20 ,  G03F1/36 ,  G03F1/70 ,  G03F1/76

CPC classification number: G03F7/70425 ,  G03F1/36 ,  G03F1/70 ,  G03F1/76

Abstract: A method of fabricating a circuit element, such as a quantum computing circuit element, including obtaining a lithography mask write file that includes mask information characterizing one or more mask features, obtaining a uniformity function that is configured to modify the mask information to compensate for a non-uniform deposition process, applying the uniformity function to the lithography mask write to obtain a modified lithography mask write file, and performing lithography as directed by the modified lithography mask write file.

公开(公告)号：US11348025B2

公开(公告)日：2022-05-31

申请号：US16474171

申请日：2017-12-08

Applicant: Google LLC

Inventor： Rami Barends

IPC: G06N10/00 ,  G01R33/035 ,  H01L39/02

Abstract: A device includes: a substrate; a superconducting quantum interference device (SQUID) including a superconductor trace arranged on an upper surface of the substrate and having at least one Josephson junction interrupting a path of the superconductor trace, in which the superconductor trace includes a first superconductor material that exhibits superconducting properties at or below a corresponding superconducting critical temperature; and a dielectric capping layer on an upper surface of the SQUID, in which the dielectric capping layer covers a majority of the superconductor trace of the SQUID, and the capping layer includes an opening through which a first region of the SQUID is exposed, the first region of the SQUID including a first Josephson junction.