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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：US12242927B2
公开(公告)日：2025-03-04
申请号：US18532394
申请日：2023-12-07
Applicant: Google LLC
Inventor： Craig Gidney , Austin Greig Fowler
IPC: G06N10/70 , G06F8/20 , G06F11/00 , G06F111/10 , G06N10/00 , G06N10/20 , G06N10/40 , H03K19/003 , H03M13/00 , H03M13/03 , H03M13/29
Abstract: Methods, systems, and apparatus for producing CCZ states and T states. In one aspect, a method for transforming a CCZ state into three T states includes obtaining a first target qubit, a second target qubit and a third target qubit in a CCZ state; performing a X−1/2 gate on the third target qubit; performing an X gate on the first target qubit and the second target qubit using the third target qubit as a control; performing a Z gate on the first target qubit and the second target qubit using the third qubit as a X axis control; performing a Z−1/4 gate on the third target qubit; and performing a Z gate on the first target qubit and the second target qubit using the third qubit as a X axis control to obtain the three T states.
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公开(公告)号：US20240265284A1
公开(公告)日：2024-08-08
申请号：US18499879
申请日：2023-11-01
Applicant: Google LLC
Inventor： Ryan Babbush , Austin Greig Fowler
IPC: G06N10/00 , G06F15/16 , G06F30/20 , G06F30/337 , G06F30/373 , G06F30/398 , G06N10/40
CPC classification number: G06N10/00 , G06F15/16 , G06F30/20 , G06F30/337 , G06F30/373 , G06F30/398 , G06N10/40
Abstract: Methods, systems and apparatus for approximating a target quantum state. In one aspect, a method for determining a target quantum state includes the actions of receiving data representing a target quantum state of a quantum system as a result of applying a quantum circuit to an initial quantum state of the quantum system; determining an approximate quantum circuit that approximates the specific quantum circuit by adaptively adjusting a number of T gates available to the specific quantum circuit; and applying the determined approximate quantum circuit to the initial quantum state to obtain an approximation of the target quantum state.
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公开(公告)号：US20240248798A1
公开(公告)日：2024-07-25
申请号：US18481796
申请日：2023-10-05
Applicant: Google LLC
Inventor： Austin Greig Fowler
CPC classification number: G06F11/1076 , G06N10/00
Abstract: Methods, systems and apparatus for quantum error correction. A layered representation of error propagation through quantum error detection circuits is constructed. The layered representation includes multiple line circuit layers that each represent a probability of local detection events in a quantum computing system associated with potential error processes in an execution of a quantum algorithm. To construct the layered representation, potential detection events associated with each potential error process occurring at quantum gates in the quantum circuit are determined. Lines are associated with each potential error process, the lines each connecting a potential detection event associated with the potential error process to another potential detection event associated with the same potential error process or a boundary of the quantum circuit. Similar lines are merged and used to construct unique line circuit layers. The layered representation is transmitted to the quantum computing system prior to execution of the quantum algorithm.
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Patent Agency Ranking
公开(公告)号：US11740962B2
公开(公告)日：2023-08-29
申请号：US17819522
申请日：2022-08-12
Applicant: Google LLC
Inventor： Austin Greig Fowler
CPC classification number: G06F11/1044 , G06F15/16 , G06N10/00 , G06N10/70
Abstract: Apparatus for quantum error correction is disclosed. The apparatus includes an array of processing cores, each processing core comprising: a processor on a first chip; and a processor cache on the first chip; and a bus for interconnecting neighbouring processing cores in the array of processing cores; wherein each processing core includes: control code which, when executed by the processor, causes the processor to access a processor cache of at least one neighbouring processing core.
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公开(公告)号：US20220382632A1
公开(公告)日：2022-12-01
申请号：US17875985
申请日：2022-07-28
Applicant: Google LLC
Inventor： Austin Greig Fowler
Abstract: A quantum error correction method including correcting a stream of syndrome measurements produced by a quantum computer comprises receiving a layered representation of error propagation through quantum error detection circuits, the layered representation comprises a plurality of line circuit layers that each represent a probability of local detection events in a quantum computer associated with one or more potential error processes in the execution of a quantum algorithm; during execution of the quantum algorithm: receiving one or more syndrome measurements from quantum error detection circuits; converting the syndrome measurements into detection events written to an array that represents a patch of quantum error correction circuits at a sequence of steps in the quantum algorithm; determining one or more errors in the execution of the quantum algorithm from the detection events in dependence upon the stored line circuit layers; and causing correction of the syndrome measurements based on the determined errors.
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公开(公告)号：US20210312314A1
公开(公告)日：2021-10-07
申请号：US17350545
申请日：2021-06-17
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：US20210035006A1
公开(公告)日：2021-02-04
申请号：US16636522
申请日：2017-08-09
Applicant: Google LLC
Inventor： John Martinis , Rami Barends , Austin Greig Fowler
IPC: G06N10/00 , H03K19/177
Abstract: Methods and systems for performing a surface code error detection cycle. In one aspect, a method includes initializing and applying Hadamard gates to multiple measurement qubits; performing entangling operations on a first set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a first direction; performing entangling operations on a second set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a second or third direction, the second and third direction being perpendicular to the first direction, the second direction being opposite to the third direction; performing entangling operations on a third set of paired qubits, wherein each pair comprises a measurement qubit coupled to a neighboring data qubit in a fourth direction, the fourth direction being opposite to the first direction; applying Hadamard gates to the measurement qubits; and measuring the measurement qubits.
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公开(公告)号：US10832156B2
公开(公告)日：2020-11-10
申请号：US16096110
申请日：2016-12-30
Applicant: Google LLC
Inventor： Yu Chen , Hartmut Neven , Austin Greig Fowler , Alireza Shabani Barzegar
Abstract: A quantum computing device includes: a first array of qubits arranged along a first axis; and a second array of qubits arranged along a second axis different from the first axis so that the qubits of the second array intersect with the qubits of the first array to form a lattice structure, in which each qubit in the first array is offset along the second axis relative to a directly adjacent qubit in the first array, each qubit in the second array is offset along the first axis relative to a directly adjacent qubit in the second array, and each intersection between a qubit from the first array and a qubit from the second array in the lattice structure comprises a coupler arranged to inductively couple the qubit from the first array to the qubit from the second array.
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