公开(公告)号：US20240119326A1

公开(公告)日：2024-04-11

申请号：US18483758

申请日：2023-10-10

Applicant: Google LLC

Inventor： Kevin Joseph Satzinger ,  Julian Shaw Kelly ,  Paul Victor Klimov ,  Alexander Nikolaevich Korotkov

IPC: G06N10/00 ,  B82Y10/00 ,  G06F15/16

CPC classification number: G06N10/00 ,  B82Y10/00 ,  G06F15/16

Abstract: Systems and methods for measuring quantum states of qubits with more than two levels are provided. A method can include, for a plurality of shuffling sequences, applying, by a quantum computer, one or more quantum gates to the one or more qubits to execute a quantum algorithm; applying, by the quantum computer, a shuffling sequence to the one or more qubits; and measuring, using a readout apparatus, the state of the one or more qubits to determine a readout state. The method can further include determining, by a classical computer or the quantum computer, an average occupation for one or more of the quantum states of the one or more qubits using the readout states for each of the shuffling sequences. The readout states can correspond to a state in a subset of the quantum states of the one or more qubits.

公开(公告)号：US11816535B1

公开(公告)日：2023-11-14

申请号：US17109448

申请日：2020-12-02

Applicant: Google LLC

Inventor： Kevin Joseph Satzinger ,  Julian Shaw Kelly ,  Paul Victor Klimov ,  Alexander Nikolaevich Korotkov

IPC: G06N10/00 ,  G06F15/16 ,  B82Y10/00

CPC classification number: G06N10/00 ,  B82Y10/00 ,  G06F15/16

Abstract: Systems and methods for measuring quantum states of qubits with more than two levels are provided. A method can include, for a plurality of shuffling sequences, applying, by a quantum computer, one or more quantum gates to the one or more qubits to execute a quantum algorithm; applying, by the quantum computer, a shuffling sequence to the one or more qubits; and measuring, using a readout apparatus, the state of the one or more qubits to determine a readout state. The method can further include determining, by a classical computer or the quantum computer, an average occupation for one or more of the quantum states of the one or more qubits using the readout states for each of the shuffling sequences. The readout states can correspond to a state in a subset of the quantum states of the one or more qubits.

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：US12182660B2

公开(公告)日：2024-12-31

申请号：US18483758

申请日：2023-10-10

Applicant: Google LLC

Inventor： Kevin Joseph Satzinger ,  Julian Shaw Kelly ,  Paul Victor Klimov ,  Alexander Nikolaevich Korotkov

IPC: G06N10/00 ,  B82Y10/00 ,  G06F15/16

Abstract: Systems and methods for measuring quantum states of qubits with more than two levels are provided. A method can include, for a plurality of shuffling sequences, applying, by a quantum computer, one or more quantum gates to the one or more qubits to execute a quantum algorithm; applying, by the quantum computer, a shuffling sequence to the one or more qubits; and measuring, using a readout apparatus, the state of the one or more qubits to determine a readout state. The method can further include determining, by a classical computer or the quantum computer, an average occupation for one or more of the quantum states of the one or more qubits using the readout states for each of the shuffling sequences. The readout states can correspond to a state in a subset of the quantum states of the one or more 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：US20210304054A1

公开(公告)日：2021-09-30

申请号：US17218690

申请日：2021-03-31

Applicant: Google LLC

Inventor： Charles James Neill ,  Vadim Smelyanskiy ,  Yu Chen ,  Xiao Mi ,  Yuezhen Niu ,  Kostyantyn Yevgenovych Kechedzhi ,  Alexander Nikolaevich Korotkov ,  Zhang Jiang

IPC: G06N10/00 ,  G06F15/16

Abstract: Systems and methods for composite quantum gate calibration for a quantum computing system are provided. In some implementations, a method includes accessing a unitary gate model describing a composite quantum gate. The unitary gate model includes a plurality of gate parameters. The method includes implementing the composite quantum gate for a plurality of gate cycles on the quantum system to amplify the plurality of gate parameters. The method includes obtaining a measurement of a state of the quantum system after implementing the composite quantum gate for the plurality of gate cycles. The method includes determining at least one of the plurality of gate parameters based at least in part on the measurement of the state of the quantum system. The method includes calibrating the composite quantum gate for the quantum computing system based at least in part on the plurality of gate parameters.