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公开(公告)号：US20200285539A1
公开(公告)日：2020-09-10
申请号：US16645756
申请日：2017-09-12
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：US12174697B2
公开(公告)日：2024-12-24
申请号：US18220752
申请日：2023-07-11
Applicant: Google LLC
Inventor： Austin Greig Fowler
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：US20240378473A1
公开(公告)日：2024-11-14
申请号：US18781756
申请日：2024-07-23
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：US12056576B2
公开(公告)日：2024-08-06
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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公开(公告)号：US11966814B2
公开(公告)日：2024-04-23
申请号：US18101522
申请日：2023-01-25
Applicant: Google LLC
Inventor： Craig Gidney , Austin Greig Fowler
CPC classification number: G06N10/00 , G06F7/4824 , G06F7/505 , G06F7/5057 , G06F7/72 , G06F17/10 , G11C11/4063 , H04B10/70
Abstract: Methods and apparatus for performing surface code computations using Auto-CCZ states. In one aspect, a method for implementing a delayed choice CZ operation on a first and second data qubit using a quantum computer includes: preparing a first and second routing qubit in a magic state; interacting the first data qubit with the first routing qubit and the second data qubit with the second routing qubit using a first and second CNOT operation, where the first and second data qubits act as controls for the CNOT operations; if a received first classical bit represents an off state: applying a first and second Hadamard gate to the first and second routing qubit; measuring the first and second routing qubit using Z basis measurements to obtain a second and third classical bit; and performing classically controlled fixup operations on the first and second data qubit using the second and third classical bits.
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Patent Agency Ranking
公开(公告)号：US11836575B2
公开(公告)日：2023-12-05
申请号：US17278137
申请日：2018-09-25
Applicant: Google LLC
Inventor： Ryan Babbush , Austin Greig Fowler
IPC: G06F5/16 , G06F30/20 , G06F30/337 , G06F30/373 , G06F30/398 , G06N10/40 , G06N10/60 , G06N10/00 , G06F15/16
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：US11763186B2
公开(公告)日：2023-09-19
申请号：US18095803
申请日：2023-01-11
Applicant: Google LLC
Inventor： John Martinis , Rami Barends , Austin Greig Fowler
IPC: G06N10/00 , H03K19/177
CPC classification number: 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：US11694104B2
公开(公告)日：2023-07-04
申请号：US16636510
申请日：2017-08-09
Applicant: GOOGLE LLC
Inventor： John Martinis , Rami Barends , Austin Greig Fowler
IPC: G06N10/00
CPC classification number: 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：US11687820B2
公开(公告)日：2023-06-27
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：US11568298B2
公开(公告)日：2023-01-31
申请号：US16833301
申请日：2020-03-27
Applicant: Google LLC
Inventor： Craig Gidney , Austin Greig Fowler
Abstract: Methods and apparatus for performing surface code computations using Auto-CCZ states. In one aspect, a method for implementing a delayed choice CZ operation on a first and second data qubit using a quantum computer includes: preparing a first and second routing qubit in a magic state; interacting the first data qubit with the first routing qubit and the second data qubit with the second routing qubit using a first and second CNOT operation, where the first and second data qubits act as controls for the CNOT operations; if a received first classical bit represents an off state: applying a first and second Hadamard gate to the first and second routing qubit; measuring the first and second routing qubit using Z basis measurements to obtain a second and third classical bit; and performing classically controlled fixup operations on the first and second data qubit using the second and third classical bits.
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