公开(公告)号：US12124922B2

公开(公告)日：2024-10-22

申请号：US17433445

申请日：2019-03-05

Applicant: Google LLC

Inventor： Vadim Smelyanskiy ,  Andre Petukhov ,  Rami Barends ,  Sergio Boixo Castrillo ,  Yu Chen

IPC: G06N10/00

CPC classification number: G06N10/00

Abstract: Methods, systems and apparatus for generating plunge schedules for implementing iSWAP quantum logic gates between a first qubit and a second qubit. In one aspect, a plunge schedule that defines a trajectory of a detuning between a frequency of the first qubit and a frequency of the second qubit includes, during a first stage, non-adiabatically driving detuning between the frequency of the first qubit and the frequency of the second qubit through a first avoided crossing in a leakage channel, during a second stage, driving detuning between the frequency of the first qubit and the frequency of the second qubit through a second avoided crossing in a swap channel. during a third stage, allowing the first qubit and the second qubit to freely evolve and interact, during a fourth stage, implementing the second stage in reverse order, and during a fifth stage, implementing the first stage in reverse order.

公开(公告)号：US20230316117A1

公开(公告)日：2023-10-05

申请号：US18298576

申请日：2023-04-11

Applicant: Google LLC

Inventor： John Martinis ,  Yu Chen ,  Hartmut Neven ,  Ovir Kafri

IPC: G06N10/00 ,  G06F30/25 ,  G06F18/214

CPC classification number: G06N10/00 ,  G06F18/214 ,  G06F30/25

Abstract: Methods, systems, and apparatus for nonlinear calibration of quantum computing apparatus. In one aspect, elements in a set of experimental data correspond to a respective configuration of control biases for the quantum computing apparatus. An initial physical model comprising one or more model parameters of the quantum computing apparatus is defined. The model is iteratively adjusted to determine a revised physical model, where at each iteration: a set of predictive data corresponding to the set of experimental data is generated, and elements in the predictive data represent a difference between the two smallest eigenvalues of a Hamiltonian characterizing the system qubits for the previous iteration, and are dependent on at least one model parameter of the physical model for the previous iteration; and the model for the previous iteration is adjusted using the obtained experimental data and the generated set of predictive data for the iteration.

公开(公告)号：US11651263B2

公开(公告)日：2023-05-16

申请号：US16624037

申请日：2017-12-15

Applicant: Google LLC

Inventor： John Martinis ,  Yu Chen ,  Hartmut Neven ,  Dvir Kafri

IPC: G06N10/00 ,  G06F30/25 ,  G06K9/62 ,  G06F18/214

CPC classification number: G06N10/00 ,  G06F18/214 ,  G06F30/25

Abstract: Methods, systems, and apparatus for nonlinear calibration of quantum computing apparatus. In one aspect, elements in a set of experimental data correspond to a respective configuration of control biases for the quantum computing apparatus. An initial physical model comprising one or more model parameters of the quantum computing apparatus is defined. The model is iteratively adjusted to determine a revised physical model, where at each iteration: a set of predictive data corresponding to the set of experimental data is generated, and elements in the predictive data represent a difference between the two smallest eigenvalues of a Hamiltonian characterizing the system qubits for the previous iteration, and are dependent on at least one model parameter of the physical model for the previous iteration; and the model for the previous iteration is adjusted using the obtained experimental data and the generated set of predictive data for the iteration.

公开(公告)号：US10657455B2

公开(公告)日：2020-05-19

申请号：US16062076

申请日：2015-12-16

Applicant: Google LLC ,  Alireza Shabani Barzegar ,  Pedram Roushan ,  Yu Chen ,  Hartmut Neven

Inventor： Alireza Shabani Barzegar ,  Pedram Roushan ,  Yu Chen ,  Hartmut Neven

IPC: G06N10/00 ,  G01R33/035 ,  H01P3/00

Abstract: A quantum computing device includes multiple co-planar waveguide flux qubits, at least one coupler element arranged such that each co-planar waveguide flux qubit, of the multiple co-planar waveguide flux qubits, is operatively couplable to each other co-planar waveguide flux qubit, of the multiple co-planar waveguide flux qubits, of the quantum computing device, and a tuning quantum device, in which the tuning quantum device is in electrical contact with a first co-planar waveguide flux qubit of the plurality of co-planar waveguide flux qubits and with a second co-planar waveguide flux qubit of the plurality of co-planar waveguide flux qubits.