公开(公告)号：US11244240B2

公开(公告)日：2022-02-08

申请号：US16301863

申请日：2016-05-17

Applicant: Google LLC

Inventor： John Martinis ,  Nan Ding ,  Ryan Babbush ,  Sergei V. Isakov ,  Hartmut Neven ,  Vadim Smelyanskiy ,  Sergio Boixo Castrillo

IPC: G06N10/00

Abstract: Methods and apparatus for estimating the fidelity of quantum hardware. In one aspect, a method includes accessing a set of quantum gates; sampling a subset of quantum gates from the set of quantum gates, wherein the subset of quantum gates defines a quantum circuit; applying the quantum circuit to a quantum system and performing measurements on the quantum system to determine output information of the quantum system; calculating output information of the quantum system based on application of the quantum circuit to the quantum system; and estimating a fidelity of the quantum circuit based on the determined output information and the calculated output information of the quantum system.

公开(公告)号：US11087233B2

公开(公告)日：2021-08-10

申请号：US16636528

申请日：2017-08-09

Applicant: Google LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: G06F17/00 ,  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：US20210035007A1

公开(公告)日：2021-02-04

申请号：US16636528

申请日：2017-08-09

Applicant: Google LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: 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：US20200258000A1

公开(公告)日：2020-08-13

申请号：US16636510

申请日：2017-08-09

Applicant: GOOGLE LLC

Inventor： John Martinis ,  Rami Barends ,  Austin Greig Fowler

IPC: 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：US12193339B1

公开(公告)日：2025-01-07

申请号：US17883156

申请日：2022-08-08

Applicant: Google LLC

Inventor： Theodore Charles White ,  John Martinis

IPC: H05K1/02 ,  G06N10/00 ,  H01P1/383 ,  H01P5/18 ,  H03F19/00 ,  H10N60/10 ,  H10N60/12 ,  H10N60/80 ,  H10N60/81 ,  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：US12156481B2

公开(公告)日：2024-11-26

申请号：US18079641

申请日：2022-12-12

Applicant: Google LLC

Inventor： John Martinis

IPC: H10N60/01 ,  H01B7/08 ,  H01B11/20 ,  H01B12/16

Abstract: The subject matter of the present disclosure may be embodied in devices, such as flexible wiring, that include: an elongated flexible substrate; multiple electrically conductive traces arranged in an array on a first side of the elongated flexible substrate; and an electromagnetic shielding layer on a second side of the elongated flexible substrate, the second side being opposite the first side, in which the elongated flexible substrate includes a fold region between a first electronically conductive trace and a second electrically conductive trace such that the electromagnetic shielding layer provides electromagnetic shielding between the first electronically conductive trace and the second electrically conductive trace.

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：US12086684B2

公开(公告)日：2024-09-10

申请号：US17201510

申请日：2021-03-15

Applicant: Google LLC

Inventor： Yu Chen ,  John Martinis ,  Daniel Thomas Sank ,  Alireza Shabani Barzegar

IPC: G06N10/00 ,  G06F13/40 ,  H01P3/00 ,  H10N60/80

CPC classification number: G06N10/00 ,  G06F13/4068 ,  H01P3/003 ,  H10N60/805

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.

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：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.