公开(公告)号：US11482656B2

公开(公告)日：2022-10-25

申请号：US16959101

申请日：2019-06-28

Applicant: Google LLC

Inventor： Charles Neill ,  Anthony Edward Megrant

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

Abstract: Methods, systems and apparatus for implementing a tunable qubit coupler. In one aspect, a device includes: a first data qubit, a second data qubit, and a third qubit that is a tunable qubit coupler arranged to couple to the first data qubit and to couple to the second data qubit such that, during operation of the device, the tunable qubit coupler allows tunable coupling between the first data qubit and the second data qubit.

公开(公告)号：US20210036206A1

公开(公告)日：2021-02-04

申请号：US16959101

申请日：2019-06-28

Applicant: Google LLC

Inventor： Charles Neill ,  Anthony Edward Megrant

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

Abstract: Methods, systems and apparatus for implementing a tunable qubit coupler. In one aspect, a device includes: a first data qubit, a second data qubit, and a third qubit that is a tunable qubit coupler arranged to couple to the first data qubit and to couple to the second data qubit such that, during operation of the device, the tunable qubit coupler allows tunable coupling between the first data qubit and the second data qubit.

公开(公告)号：US12127484B2

公开(公告)日：2024-10-22

申请号：US17971292

申请日：2022-10-21

Applicant: Google LLC

Inventor： Charles Neill ,  Anthony Edward Megrant

IPC: H10N60/80 ,  G06N10/00 ,  H10N60/12

CPC classification number: H10N60/805 ,  G06N10/00 ,  H10N60/12

Abstract: Methods, systems and apparatus for implementing a tunable qubit coupler. In one aspect, a device includes: a first data qubit, a second data qubit, and a third qubit that is a tunable qubit coupler arranged to couple to the first data qubit and to couple to the second data qubit such that, during operation of the device, the tunable qubit coupler allows tunable coupling between the first data qubit and the second data qubit.

公开(公告)号：US20220215283A1

公开(公告)日：2022-07-07

申请号：US17612151

申请日：2020-05-15

Applicant: Google LLC

Inventor： Charles Neill ,  Anthony Edward Megrant

IPC: G06N10/40 ,  G06F15/82

Abstract: A method is presented, including providing an offset magnetic flux bias to a plurality of superconducting qubits and providing respective control magnetic flux biases, for performing a computation, to the plurality of qubits using a plurality of control lines coupled respectively to each qubit. The qubits are configured such that respective resonance frequencies of the qubits are controlled by the offset magnetic flux bias and the respective control magnetic flux biases. The qubits are arranged to perform the computation when the respective resonance frequencies of the qubits are within an operational dynamic range.

公开(公告)号：US12204993B2

公开(公告)日：2025-01-21

申请号：US17623194

申请日：2019-10-25

Applicant: Google LLC

Inventor： Kevin Satzinger ,  Charles Neill ,  Julian Shaw Kelly ,  Andrew Dunsworth

IPC: G06N10/20 ,  G06N10/70

Abstract: Methods, systems and apparatus for benchmarking quantum computing hardware. In one aspect, a method includes defining an initial circuit configured to operate on an array of qubits, wherein the initial circuit comprises multiple instances of the two-qubit gate, wherein each instance of the two-qubit gate performs a same operation on a respective pair of neighboring qubits in the array; partitioning the initial circuit into multiple layers, wherein instances of the two-qubit gate in a respective layer can be implemented in parallel; for each of the multiple layers: constructing benchmarking circuits for the layer, wherein each benchmarking circuit for the layer comprises one or more cycles of quantum gates, each cycle comprising: the layer of instances of the two-qubit gate, and a plurality of single qubit gates; implementing the constructed benchmarking circuits to obtain experimental benchmarking data; and adjusting control parameters of the control model using the experimental benchmarking data.

公开(公告)号：US20210182728A1

公开(公告)日：2021-06-17

申请号：US17271323

申请日：2019-08-27

Applicant: Google LLC

Inventor： Charles Neill ,  Anthony Edward Megrant

IPC: G06N10/00 ,  H03K19/173

Abstract: Methods, systems and apparatus for implementing two-qubit gates using a tunable coupler. In one aspect, a method of implementing a two-qubit gate includes: applying a unitary transformation control signal to a tunable coupler arranged between a first data qubit and a second data qubit to obtain a target unitary transformation of the first data qubit and the second data qubit, w'herein the unitary transformation control signal is applied to the tunable coupler over a predetermined period of time to allow coupling between the first data qubit and the second data qubit through the tunable coupler.

公开(公告)号：US11593696B2

公开(公告)日：2023-02-28

申请号：US16870372

申请日：2020-05-08

Applicant: Google LLC

Inventor： Charles Neill ,  Anthony Edward Megrant ,  Yu Chen

IPC: G06N10/00

Abstract: Methods, systems and apparatus for implementing a target two-qubit quantum logic gate on a first qubit and second qubit using a tunable qubit coupler. In one aspect, a method includes generating a control signal for the target two-qubit quantum logic gate according to a control model, wherein the control model comprises a controlled-Z operator and a swap operator that are non-orthogonal; and applying the control signal to the first qubit, second qubit and tunable qubit coupler.

公开(公告)号：US20230032766A1

公开(公告)日：2023-02-02

申请号：US16870372

申请日：2020-05-08

Applicant: Google LLC

Inventor： Charles Neill ,  Anthony Edward Megrant ,  Yu Chen

IPC: G06N10/00

Abstract: Methods, systems and apparatus for implementing a target two-qubit quantum logic gate on a first qubit and second qubit using a tunable qubit coupler. In one aspect, a method includes generating a control signal for the target two-qubit quantum logic gate according to a control model, wherein the control model comprises a controlled-Z operator and a swap operator that are non-orthogonal; and applying the control signal to the first qubit, second qubit and tunable qubit coupler.

公开(公告)号：US20220246677A1

公开(公告)日：2022-08-04

申请号：US17610241

申请日：2019-05-10

Applicant: Google LLC

Inventor： Julian Shaw Kelly ,  Anthony Edward Megrant ,  Rami Barends ,  Charles Neill ,  Daniel Thomas Sank ,  Evan Jeffrey ,  Amit Vainsencher ,  Paul Klimov ,  Christopher Michael Quintana

IPC: H01L27/18 ,  G06N10/40 ,  H01L39/22

Abstract: A quantum computing device includes: a qubit; a single XYZ control line, in which the qubit and the single control line are configured and arranged such that, during operation of the quantum computing device, the single XYZ control line allows coupling of an XY qubit control flux bias, from the single XYZ control line to the qubit, over a first frequency range at a first predetermined effective coupling strength, and coupling of a Z qubit control flux bias, from the single XYZ control line to the qubit, over a second frequency range at a second predetermined effective coupling strength.

公开(公告)号：US12260297B2

公开(公告)日：2025-03-25

申请号：US17271323

申请日：2019-08-27

Applicant: Google LLC

Inventor： Charles Neill ,  Anthony Edward Megrant

IPC: G06N10/40 ,  G06N10/70 ,  H03K19/173 ,  H03K19/195

Abstract: Methods, systems and apparatus for implementing two-qubit gates using a tunable coupler. In one aspect, a method of implementing a two-qubit gate includes: applying a unitary transformation control signal to a tunable coupler arranged between a first data qubit and a second data qubit to obtain a target unitary transformation of the first data qubit and the second data qubit, wherein the unitary transformation control signal is applied to the tunable coupler over a predetermined period of time to allow coupling between the first data qubit and the second data qubit through the tunable coupler.