公开(公告)号：US12169673B2

公开(公告)日：2024-12-17

申请号：US18045102

申请日：2022-10-07

Applicant: Amazon Technologies, Inc.

Inventor： Christopher Chamberland ,  Fernando Brandao ,  Earl Campbell

IPC: G06F30/3308 ,  G06F8/20 ,  G06N10/00 ,  G06F111/10 ,  G06F119/02

Abstract: A Toffoli magic state to be injected in preparation of a Toffoli gate may be prepared using a bottom-up approach. In the bottom-up approach, computational basis states are prepared in a fault tolerant manner using a STOP algorithm. The computational basis states are further used to prepare the Toffoli magic state. The STOP algorithm tracks syndrome outcomes and can be used to determine when to stop repeating syndrome measurements such that faults are guaranteed to be below a threshold level. Also, the STOP algorithm may be used in growing repetition code from a first code distance to a second code distance, such as for use in the computational basis states.

公开(公告)号：US11983601B2

公开(公告)日：2024-05-14

申请号：US17218046

申请日：2021-03-30

Applicant: Amazon Technologies, Inc.

Inventor： Christopher Chamberland ,  Kyungjoo Noh

IPC: G06N10/00 ,  G01R33/035 ,  G06F11/10 ,  H10N60/12

CPC classification number: G06N10/00 ,  G01R33/0354 ,  G06F11/1012 ,  H10N60/12

Abstract: A hybrid Bacon-Shor surface code is implemented using a fault tolerant quantum computer comprising hybrid acoustic-electric qubits. A control circuit includes an asymmetrically threaded superconducting quantum interference devices (ATS) that excites phonons in a mechanical resonator by driving a storage mode of the mechanical resonator and dissipates phonons from the mechanical resonator via an open transmission line coupled to the control circuit. The hybrid Bacon-Shor surface code only couples four phononic modes per given ATS, reducing cross-talk as compared to other systems that couple more phononic modes per ATS. Also, measurements are performed such that three parity measurements are taken between a phononic readout mode and a transmon qubit in a given syndrome measurement cycle.

公开(公告)号：US11900221B1

公开(公告)日：2024-02-13

申请号：US17545895

申请日：2021-12-08

Applicant: Amazon Technologies, Inc.

Inventor： Christopher Chamberland ,  Earl Terence Campbell

IPC: G06N10/70 ,  G06N10/20

CPC classification number: G06N10/70 ,  G06N10/20

Abstract: A technique for performing lattice surgery without using twists is disclosed. Also, an error correcting code and decoder is provided that allows for error decoding of Pauli measurements performed in association with a lattice surgery operation. This allows for overall run-times of lattice surgery to be reduced. For example, some level of errors are tolerable, because they can be corrected, thus fewer measurement rounds (dm) may be performed for a given round of Pauli measurements. Additionally, a temporal encoding of lattice surgery technique is provided, which may additionally or alternatively be used to shorten run times. Also, a quantum computer layout is provided, wherein the layout includes a core computing region and a cache region. Also, protocols for swapping logical qubits between the core and cache are provided.

公开(公告)号：US11599820B1

公开(公告)日：2023-03-07

申请号：US17362750

申请日：2021-06-29

Applicant: Amazon Technologies, Inc.

Inventor： Kyungjoo Noh ,  Christopher Chamberland ,  Fernando Brandao

IPC: G06N10/70 ,  G06F11/10 ,  G06N10/00

Abstract: A fault tolerant quantum error correction protocol is implemented for a surface code comprising Gottesman Kitaev Preskill (GKP) qubits. Analog information is determined when measuring position or momentum shifts, wherein the analog information indicates a closeness of the shift to a decision boundary. The analog information may further be used to determine confidence values for error corrected measurements from the GKP qubits of the surface code.

公开(公告)号：US11468219B2

公开(公告)日：2022-10-11

申请号：US17098237

申请日：2020-11-13

Applicant: Amazon Technologies, Inc.

Inventor： Christopher Chamberland ,  Fernando Brandao ,  Earl Campbell

IPC: G06F30/3308 ,  G06F119/02 ,  G06F8/20 ,  G06N10/00 ,  G06F111/10

Abstract: A Toffoli magic state to be injected in preparation of a Toffoli gate may be prepared using a bottom-up approach. In the bottom-up approach, computational basis states are prepared in a fault tolerant manner using a STOP algorithm. The computational basis states are further used to prepare the Toffoli magic state. The STOP algorithm tracks syndrome outcomes and can be used to determine when to stop repeating syndrome measurements such that faults are guaranteed to be below a threshold level. Also, the STOP algorithm may be used in growing repetition code from a first code distance to a second code distance, such as for use in the computational basis states.

公开(公告)号：US20220156621A1

公开(公告)日：2022-05-19

申请号：US17098232

申请日：2020-11-13

Applicant: Amazon Technologies, Inc.

Inventor： Patricio Arrangoiz Arriola ,  Amir Safavi-Naeini ,  Oskar Jon Painter ,  Connor Hann ,  Fernando Brandao ,  Kyungjoo Noh ,  Joseph Kramer Iverson ,  Harald Esko Jakob Putterman ,  Christopher Chamberland ,  Earl Campbell

IPC: G06N10/00 ,  H03K17/92

Abstract: A fault tolerant quantum computer is implemented using hybrid acoustic-electric qubits. A control circuit includes an asymmetrically threaded superconducting quantum interference devices (ATS) that excites excite phonons in a mechanical resonator by driving a storage mode of the mechanical resonator and dissipates phonons from the mechanical resonator via an open transmission line coupled to the control circuit, wherein the open transmission line is configured to absorb photons from a dump mode of the control circuit.

公开(公告)号：US20220156441A1

公开(公告)日：2022-05-19

申请号：US17098240

申请日：2020-11-13

Applicant: Amazon Technologies, Inc.

Inventor： Earl Campbell ,  Christopher Chamberland

IPC: G06F30/33 ,  G06N10/00 ,  G01R31/3177 ,  H03K19/195

Abstract: A top-down distillation process for preparing low-error rate Toffoli gates utilizes Toffoli magic states as inputs to the distillation process. Multiple Toffoli magic states are used to distill a low-error rate Toffoli gate via one round of distillation. Lattice surgery operations are performed to distill the low-error rate Toffoli gate from the multiple Toffoli magic states. Each round of lattice surgery operations acts on a check qubit associated with the low error rate Toffoli gate being distilled. Errors introduced during the distillation (if non-trivial) will be manifest in the check qubit. Thus, the check qubit is measured subsequent to performing the lattice surgery operations to verify that the distilled Toffoli gate is very likely to be provide a correct result.