公开(公告)号：US12056576B2

公开(公告)日：2024-08-06

申请号：US18202190

申请日：2023-05-25

Applicant: Google LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: G06F15/80 ,  G06N10/00 ,  G06N10/20 ,  G06N10/40 ,  G06N10/70

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：US20230342651A1

公开(公告)日：2023-10-26

申请号：US18305174

申请日：2023-04-21

Applicant: Google LLC

Inventor： Kevin Chenghao Miao ,  Alexander Korotkov ,  Matthew James McEwen ,  Rami Barends ,  Juan Carlos Atalaya Chavez

IPC: G06N10/70 ,  G06N10/40

CPC classification number: G06N10/70 ,  G06N10/40

Abstract: Methods, systems and apparatus for transporting data qubit leakage. In one aspect, an apparatus includes, for a data qubit that has been operated on by a quantum computing system to place the data qubit in a first state, wherein the first state encodes logical information: preparing, by the quantum computing system, an ancilla qubit in a known initial state; and performing, by the quantum computing system, a leakage transport operation using one or more two-qubit gates on the data qubit and the ancilla qubit to transfer leakage from the data qubit to the ancilla qubit.

公开(公告)号：US11763186B2

公开(公告)日：2023-09-19

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：US20230270021A1

公开(公告)日：2023-08-24

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：US11694104B2

公开(公告)日：2023-07-04

申请号：US16636510

申请日：2017-08-09

Applicant: GOOGLE LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: G06N10/00

CPC classification number: G06N10/00

Abstract: Methods, systems, and apparatus for performing an entangling operation on a system of qubits. In one aspect, a method includes operating the system of qubits, wherein the system of qubits comprises: a plurality of first qubits, a plurality of second qubits, a plurality of qubit couplers defining nearest neighbor interactions between the first qubits and second qubits, wherein the system of qubits is arranged as a two dimensional grid and each qubit of the multiple first qubits is coupled to multiple second qubits through respective qubit couplers, and wherein operating the system of qubits comprises: pairing multiple first qubits with respective neighboring second qubits; performing an entangling operation on each paired first and second qubit in parallel, comprising detuning each second qubit in the paired first and second qubits in parallel.

公开(公告)号：US11687820B2

公开(公告)日：2023-06-27

申请号：US17350545

申请日：2021-06-17

Applicant: Google LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: G06F17/00 ,  G06N10/00 ,  G06F15/80

CPC classification number: G06N10/00 ,  G06F15/80

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：US20230119165A1

公开(公告)日：2023-04-20

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

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：US20220414514A1

公开(公告)日：2022-12-29

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: G06N10/40

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：US10990017B2

公开(公告)日：2021-04-27

申请号：US16325319

申请日：2017-12-01

Applicant: Google LLC

Inventor： Brian James Burkett ,  Rami Barends

IPC: G03F7/20 ,  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：US20180322409A1

公开(公告)日：2018-11-08

申请号：US15774033

申请日：2015-11-06

Applicant: Google LLC

Inventor： Rami Barends

IPC: G06N99/00 ,  G06F17/16

CPC classification number: G06N10/00 ,  G06F17/16

Abstract: Methods, systems, and apparatus for individual qubit excitation control. In one aspect, a method includes accessing a quantum system that comprises a plurality of qubits; a plurality of qubit frequency control lines, each qubit frequency control line corresponding to an individual qubit and controlling the frequency of the qubit; a driveline; a plurality of couplers, each coupler coupling a corresponding qubit to the driveline so that a plurality of qubits are coupled to the driveline; determining one or more qubits that require a rotation operation; for each qubit requiring a rotation operation: tuning the qubit frequency to the corresponding driveline frequency of the rotation operation; performing the rotation operation using a microwave pulse on the excitation drive; and tuning the qubit away from the driveline frequency of the rotation operation.