公开(公告)号：US20220027773A1

公开(公告)日：2022-01-27

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

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：US11049036B2

公开(公告)日：2021-06-29

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：US20210065062A1

公开(公告)日：2021-03-04

申请号：US17096524

申请日：2020-11-12

Applicant: Google LLC

Inventor： Rami Barends

IPC: G06N20/00 ,  G06N10/00 ,  F41J1/10 ,  F41J5/18 ,  F41J7/04 ,  F41J9/02 ,  H01L27/18 ,  H03K3/38

Abstract: Apparatus and methods for removing leakage from a qubit. In one aspect, an apparatus includes one or more qubits, wherein each qubit facilitates occupation of at least one of a plurality of qubit levels, the qubit levels including two computational levels and one or more non-computational levels that are each higher than the computational levels, wherein the qubit facilitates transitions between qubit levels associated with a corresponding transition frequency; a cavity, wherein the cavity defines a cavity frequency; one or more couplers coupling each qubit to the cavity; one or more couplers coupling the cavity to an environment external to the one or more qubits and the cavity; a frequency controller that controls the frequency of each qubit such that, for each qubit, the frequency of the qubit is adjusted relative to the cavity frequency such that a population of a non-computational level is transferred to the cavity.

公开(公告)号：US20180314967A1

公开(公告)日：2018-11-01

申请号：US15771106

申请日：2015-10-29

Applicant: Rami BARENDS ,  Google LLC

Inventor： Rami Barends

IPC: G06N99/00 ,  H01L27/18 ,  H03K3/38

CPC classification number: G06N99/002 ,  H01L27/18 ,  H03K3/38

Abstract: Apparatus and methods for removing leakage from a qubit. In one aspect, an apparatus includes one or more qubits, wherein each qubit facilitates occupation of at least one of a plurality of qubit levels, the qubit levels including two computational levels and one or more non-computational levels that are each higher than the computational levels, wherein the qubit facilitates transitions between qubit levels associated with a corresponding transition frequency; a cavity, wherein the cavity defines a cavity frequency; one or more couplers coupling each qubit to the cavity; one or more couplers coupling the cavity to an environment external to the one or more qubits and the cavity; a frequency controller that controls the frequency of each qubit such that, for each qubit, the frequency of the qubit is adjusted relative to the cavity frequency such that a population of a non-computational level is transferred to the cavity.