Patents by Inventor Fernando Brandao
Fernando Brandao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11941483Abstract: A fault tolerant quantum computer is implementing using 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, wherein the open transmission line is configured to absorb photons from a dump mode of the control circuit. Filters are included in the control circuit to suppress cross-talk errors. Additionally, frequencies and pump mode detunings for respective multiplexed control circuits are strategically selected to reduce cross-talk errors.Type: GrantFiled: March 30, 2021Date of Patent: March 26, 2024Assignee: Amazon Technologies, Inc.Inventors: Connor Hann, Kyungjoo Noh, Patricio Arrangoiz Arriola, Christopher Chamberland, Fernando Brandao
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Patent number: 11853159Abstract: 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 is further used to determine confidence values for error corrected measurements from the GKP qubits of the surface code. These confidence values are used to dynamically determine edge weights in a matching graph used to decode syndrome measurements of the surface code, wherein the confidence values are obtained using a maximum-likelihood decoding protocol for two-qubit gates. Space-time correlated edges and other edges are included in the matching graph and weighted based at least in part on confidence values for qubits forming the respective edges.Type: GrantFiled: June 29, 2021Date of Patent: December 26, 2023Assignee: Amazon Technologies, Inc.Inventors: Christopher Chamberland, Kyungjoo Noh, Fernando Brandao
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Preparation of qunaught states for a surface GKP code using a three (or higher) level ancilla system
Patent number: 11645570Abstract: 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 is further used to determine confidence values for error corrected measurements from the GKP qubits of the surface code. These confidence values are used to dynamically determine edge weights in a matching graph used to decode syndrome measurements of the surface code, wherein the confidence values are obtained using a maximum-likelihood decoding protocol for two-qubit gates. Also, a three-level ancilla is used to more reliably squeeze the GKP qunaught states.Type: GrantFiled: June 29, 2021Date of Patent: May 9, 2023Assignee: Amazon Technologies, Inc.Inventors: Kyungjoo Noh, Christopher Chamberland, Fernando Brandao -
Publication number: 20230080126Abstract: 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.Type: ApplicationFiled: October 7, 2022Publication date: March 16, 2023Applicant: Amazon Technologies, Inc.Inventors: Christopher Chamberland, Fernando Brandao, Earl Campbell
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Patent number: 11599820Abstract: 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.Type: GrantFiled: June 29, 2021Date of Patent: March 7, 2023Assignee: Amazon Technologies, Inc.Inventors: Kyungjoo Noh, Christopher Chamberland, Fernando Brandao
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Patent number: 11580436Abstract: Extra edges are added to a group of edges for use in decoding syndrome measurements of a surface code implemented using hybrid acoustic-electric qubits. The extra edges include two-dimensional cross-edges and three-dimensional space-time correlated edges that identify correlated errors arising from spurious photon dissipation processes of a multiplexed control circuit that leads to cross-talk between storage modes of a set of the mechanical resonators controlled by the given multiplexed control circuit. Additionally, error probabilities used for edge weighting incorporate error probabilities due to the spurious photon dissipation processes.Type: GrantFiled: March 30, 2021Date of Patent: February 14, 2023Assignee: Amazon Technologies, Inc.Inventors: Christopher Chamberland, Kyungjoo Noh, Connor Hann, Fernando Brandao
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Patent number: 11468219Abstract: 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.Type: GrantFiled: November 13, 2020Date of Patent: October 11, 2022Assignee: Amazon Technologies, Inc.Inventors: Christopher Chamberland, Fernando Brandao, Earl Campbell
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Publication number: 20220180236Abstract: A fault tolerant quantum computer is implementing using 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, wherein the open transmission line is configured to absorb photons from a dump mode of the control circuit. Filters are included in the control circuit to suppress cross-talk errors. Additionally, frequencies and pump mode detunings for respective multiplexed control circuits are strategically selected to reduce cross-talk errors.Type: ApplicationFiled: March 30, 2021Publication date: June 9, 2022Applicant: Amazon Technologies, Inc.Inventors: Connor Hann, Kyungjoo Noh, Patricio Arrangoiz Arriola, Christopher Chamberland, Fernando Brandao
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Publication number: 20220178995Abstract: Extra edges are added to a group of edges for use in decoding syndrome measurements of a surface code implemented using hybrid acoustic-electric qubits. The extra edges include two-dimensional cross-edges and three-dimensional space-time correlated edges that identify correlated errors arising from spurious photon dissipation processes of a multiplexed control circuit that leads to cross-talk between storage modes of a set of the mechanical resonators controlled by the given multiplexed control circuit. Additionally, error probabilities used for edge weighting incorporate error probabilities due to the spurious photon dissipation processes.Type: ApplicationFiled: March 30, 2021Publication date: June 9, 2022Applicant: Amazon Technologies, Inc.Inventors: Christopher Chamberland, Kyungjoo Noh, Connor Hann, Fernando Brandao
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Publication number: 20220156621Abstract: 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.Type: ApplicationFiled: November 13, 2020Publication date: May 19, 2022Applicant: Amazon Technologies, Inc.Inventors: 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
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Publication number: 20220156443Abstract: 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.Type: ApplicationFiled: November 13, 2020Publication date: May 19, 2022Applicant: Amazon Technologies, Inc.Inventors: Christopher Chamberland, Fernando Brandao, Earl Campbell
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Patent number: 11321627Abstract: 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.Type: GrantFiled: November 13, 2020Date of Patent: May 3, 2022Assignee: Amazon Technologies, Inc.Inventors: 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