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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
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.
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公开(公告)号：US20210208509A1
公开(公告)日：2021-07-08
申请号：US17208391
申请日：2021-03-22
Applicant: Google LLC
Inventor： Brian James Burkett , Rami Barends
Abstract: A method of fabricating a circuit element, such as a quantum computing circuit element, including obtaining a lithography mask write file that includes mask information characterizing one or more mask features, obtaining a uniformity function that is configured to modify the mask information to compensate for a non-uniform deposition process, applying the uniformity function to the lithography mask write to obtain a modified lithography mask write file, and performing lithography as directed by the modified lithography mask write file.
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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
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.
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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.
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公开(公告)号：US10572815B2
公开(公告)日：2020-02-25
申请号：US15774033
申请日：2015-11-06
Applicant: Google LLC
Inventor： Rami Barends
Abstract: Methods, systems, and apparatus for individual qubit excitation control. In one aspect, a method includes accessing a quantum system that comprises a plurality of qubits; a plurality of qubit frequency control lines, each qubit frequency control line corresponding to an individual qubit and controlling the frequency of the qubit; a driveline; a plurality of couplers, each coupler coupling a corresponding qubit to the driveline so that a plurality of qubits are coupled to the driveline; determining one or more qubits that require a rotation operation; for each qubit requiring a rotation operation: tuning the qubit frequency to the corresponding driveline frequency of the rotation operation; performing the rotation operation using a microwave pulse on the excitation drive; and tuning the qubit away from the driveline frequency of the rotation operation.
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Patent Agency Ranking
公开(公告)号：US10422607B2
公开(公告)日：2019-09-24
申请号：US16284532
申请日：2019-02-25
Applicant: Google LLC
Inventor： Rami Barends
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.
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公开(公告)号：US10217057B2
公开(公告)日：2019-02-26
申请号：US15771106
申请日：2015-10-29
Applicant: Google LLC , Rami Barends
Inventor： Rami Barends
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.
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公开(公告)号：US12067457B2
公开(公告)日：2024-08-20
申请号：US16981075
申请日：2019-01-31
Applicant: Google LLC
Inventor： Vadim Smelyanskiy , Andre Petukhov , Rami Barends , Sergio Boixo Castrillo
IPC: H03K19/195 , G06N10/00 , G06N10/20 , G06N10/60
Abstract: Methods, systems and apparatus for implementing iSWAP quantum logic gates between a first qubit and a second qubit. In one aspect, a method includes implementing a cascade schedule that defines a trajectory of a detuning between a frequency of the first qubit and a frequency of the second qubit. Implementing the cascade schedule includes: during a first stage, 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, evolving the first qubit and second qubit; during a fourth stage, implementing the second stage in reverse order; and during a fifth stage, implementing the first stage in reverse order.
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公开(公告)号：US20240112059A1
公开(公告)日：2024-04-04
申请号：US18305152
申请日：2023-04-21
Applicant: Google LLC
Inventor： Kevin Chenghao Miao , Alexander Korolkov , Mathew James McEwen , Rami Barends
Abstract: Methods, systems and apparatus for resetting a qubit. In one aspect, an apparatus includes a qubit, wherein the state of the qubit occupies a plurality of levels comprising two computational levels and one or more non-computational levels; a resonator that operates at a resonator frequency; control electronics that control a frequency of the qubit such that during a reset operation the qubit frequency is adjusted from a holding frequency that is lower than the resonator frequency to an idling frequency that is higher than the resonator frequency, and during the adjustment a first derivative of the qubit frequency at a first time is positive, at a second time that occurs after the first time is zero, and at a third time that occurs after the second time is positive, where the qubit frequency achieves the idling frequency at a fourth time that occurs after the third time.
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公开(公告)号：US20240086747A1
公开(公告)日：2024-03-14
申请号：US18202190
申请日：2023-05-25
Applicant: Google LLC
Inventor： John Martinis , Rami Barends , Austin Greig Fowler
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.
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