-
公开(公告)号：US12079686B2
公开(公告)日：2024-09-03
申请号：US16975628
申请日：2019-05-10
Applicant: Google LLC
Inventor： Ryan Babbush , Jarrod Ryan McClean
IPC: G06N10/00 , H03K19/173
CPC classification number: G06N10/00 , H03K19/173
Abstract: Methods, systems and apparatus for targeting many-body states on a quantum computer. In one aspect, a method includes an adaptive phase shift method that includes preparing the quantum system in an initial state, wherein the initial state has non-zero overlap with the target eigenstate; preparing an ancilla qubit in a zero computational basis state; and iteratively applying a quantum eigenstate locking circuit to the quantum system and ancilla qubit until the state of the quantum system approximates the target eigenstate, wherein the quantum eigenstate locking circuit comprises a phase gate that, at each n-th iteration, is updated using a current average energy estimate of the quantum system.
-
公开(公告)号：US20240014829A1
公开(公告)日：2024-01-11
申请号：US18473041
申请日：2023-09-22
Applicant: Google LLC
Inventor： Jarrod Ryan McClean , Ryan Babbush , Zhang Jiang
CPC classification number: H03M13/1575 , G06N10/00
Abstract: Methods, systems and apparatus for correcting a result of a quantum computation. In one aspect, a method includes selecting a quantum error correcting code for the quantum computation, wherein the quantum error correcting code is defined by multiple stabilizer generators; determining a set of symmetry operators, comprising: selecting a subset of the stabilizer generators, determining, for each selected stabilizer generator, a sum between an identity operator and the stabilizer generator, and multiplying the determined sums together to form a summation of terms, wherein each term in the summation is equal to a respective symmetry operator; measuring a projective correction of a physical observable over an output quantum state of the quantum computation using the determined set of symmetry operators, wherein the physical observable corresponds to the result of the quantum computation; and determining a corrected result of the quantum computation using the measured projective correction of the physical observable.
-
13.发明申请公开(公告)号：US20230126123A1
公开(公告)日：2023-04-27
申请号：US17970943
申请日：2022-10-21
Applicant: Google LLC
Inventor： Bill Huggins , Jarrod Ryan McClean
Abstract: Quantum computing systems and methods for determining a state of a physical system are provided. In some examples, a method can include obtaining a defined function associated with the physical system, the defined function encoding an estimated value of at least one property to be simulated by a quantum computing system as a gradient of the defined function. The method can include implementing a quantum circuit on a plurality of qubits in a quantum computing system to perform a quantum operation (e.g., the Gilyén quantum gradient algorithm) on the plurality of qubits. The quantum operation is operable to determine the gradient of the defined function. The method can include determining the estimated value for the at least one property based at least on at least one of the plurality of qubits after implementation of the quantum operation.
-
公开(公告)号：US20220414519A1
公开(公告)日：2022-12-29
申请号：US17777708
申请日：2020-11-16
Applicant: Google LLC
Inventor： Jarrod Ryan McClean , Sergio Boixo Castrillo , Craig Gidney , Vadim Smelyanskiy
Abstract: Systems and methods for quantum error mitigation are provided. A method can include accessing a quantum system; implementing a plurality of quantum circuits; obtaining a plurality of measurements performed for each of the quantum circuits; determining an estimated average value of an observable of interest (O)f for the quantum circuits based at least in part on the plurality of measurements; and determining an estimated noiseless value of an observable of interest (O)ψ based at least in part on the estimated average value of the observable of interest (O)f using a single-point full depolarizing error model. Each of the plurality of quantum circuits can be implemented by a different sequence of quantum gates as compared to each of the other quantum circuits in the plurality to thereby implement one or more circuit gauges and can be an equivalent logical operation as each of the other quantum circuits in the plurality.
-
公开(公告)号：US20220358394A1
公开(公告)日：2022-11-10
申请号：US17731016
申请日：2022-04-27
Applicant: Google LLC
Inventor： Jarrod Ryan McClean
Abstract: Methods, systems, and apparatus for quantum data processing. In one aspect, a method includes storing, in a quantum memory, multiple copies of a quantum state, comprising, for each copy of the quantum state, i) probing, by an initialized quantum sensor, a target system to obtain an evolved quantum state of the quantum sensor, ii) transducing the evolved quantum state of the quantum sensor into a quantum state of a quantum buffer, iii) logically encoding the quantum state of the quantum buffer into a quantum error correcting code, and iv) moving the logically encoded quantum state of the quantum buffer into the quantum memory; loading the multiple copies of the quantum state in the quantum memory into a quantum computer; processing, by the quantum computer, the multiple copies of the quantum state to obtain a purified quantum state; and measuring the purified quantum state to determine properties of the target system.
-
Patent Agency Ranking
公开(公告)号：US12282827B2
公开(公告)日：2025-04-22
申请号：US18036252
申请日：2021-11-11
Applicant: Google LLC
Inventor： William Huggins , Jarrod Ryan McClean
Abstract: Methods, systems and apparatus for determining an error-mitigated expectation value of a target observable with respect to a noisy quantum state. In one aspect a method includes obtaining multiple copies of the noisy quantum state; performing measurements on tensor products of M copies of the noisy quantum state to compute an expectation value of the target observable with respect to an entangled quantum state, wherein M?1 and eigenvalues corresponding to non-dominant eigenvectors of the noisy quantum state in the spectral decomposition of the entangled quantum state are suppressed exponentially in M; and using the computed expectation value of the target observable with respect to an entangled quantum state to determine the error-mitigated expectation value of the target observable with respect to the noisy quantum state.
-
公开(公告)号：US12249404B2
公开(公告)日：2025-03-11
申请号：US17630482
申请日：2020-07-28
Applicant: Google LLC
Inventor： Ryan Babbush , William Huggins , Jarrod Ryan McClean
Abstract: Methods, systems and apparatus for measuring the energy of a quantum chemical system. In one aspect, a method includes obtaining a Hamiltonian describing the chemical system, where the Hamiltonian is expressed in an orthonormal basis; decomposing the Hamiltonian into a sum of terms where each term comprises a respective operator that effects a respective single particle basis rotation, and one or more particle density operators; repeatedly, for each group comprising terms with a same operator that effects a respective single particle basis rotation, measuring expectation values of the terms included in the group, comprising: performing the respective single particle basis rotation on a qubit system encoding a state of the chemical system; and measuring Jordan-Wigner transformations of the one or more particle density operators in the group to obtain a respective measurement result for the group; and determining the energy of the chemical system using the obtained measurement results.
-
公开(公告)号：US12210936B2
公开(公告)日：2025-01-28
申请号：US18473041
申请日：2023-09-22
Applicant: Google LLC
Inventor： Jarrod Ryan McClean , Ryan Babbush , Zhang Jiang
Abstract: Methods, systems and apparatus for correcting a result of a quantum computation. In one aspect, a method includes selecting a quantum error correcting code for the quantum computation, wherein the quantum error correcting code is defined by multiple stabilizer generators; determining a set of symmetry operators, comprising: selecting a subset of the stabilizer generators, determining, for each selected stabilizer generator, a sum between an identity operator and the stabilizer generator, and multiplying the determined sums together to form a summation of terms, wherein each term in the summation is equal to a respective symmetry operator; measuring a projective correction of a physical observable over an output quantum state of the quantum computation using the determined set of symmetry operators, wherein the physical observable corresponds to the result of the quantum computation; and determining a corrected result of the quantum computation using the measured projective correction of the physical observable.
-
公开(公告)号：US20250030440A1
公开(公告)日：2025-01-23
申请号：US18473029
申请日：2023-09-22
Applicant: Google LLC
Inventor： Jarrod Ryan McClean , Ryan Babbush , Zhang Jiang
Abstract: Methods, systems and apparatus for correcting a result of a quantum computation. In one aspect, a method includes selecting a quantum error correcting code for the quantum computation, wherein the quantum error correcting code is defined by multiple stabilizer generators; determining a set of symmetry operators, comprising: selecting a subset of the stabilizer generators, determining, for each selected stabilizer generator, a sum between an identity operator and the stabilizer generator, and multiplying the determined sums together to form a summation of terms, wherein each term in the summation is equal to a respective symmetry operator; measuring a projective correction of a physical observable over an output quantum state of the quantum computation using the determined set of symmetry operators, wherein the physical observable corresponds to the result of the quantum computation; and determining a corrected result of the quantum computation using the measured projective correction of the physical observable.
-
公开(公告)号：US11894860B2
公开(公告)日：2024-02-06
申请号：US17433459
申请日：2020-03-05
Applicant: Google LLC
Inventor： Jarrod Ryan McClean , Ryan Babbush , Zhang Jiang
CPC classification number: H03M13/1575 , G06N10/00
Abstract: Methods, systems and apparatus for correcting a result of a quantum computation. In one aspect, a method includes selecting a quantum error correcting code for the quantum computation, wherein the quantum error correcting code is defined by multiple stabilizer generators; determining a set of symmetry operators, comprising: selecting a subset of the stabilizer generators, determining, for each selected stabilizer generator, a sum between an identity operator and the stabilizer generator, and multiplying the determined sums together to form a summation of terms, wherein each term in the summation is equal to a respective symmetry operator; measuring a projective correction of a physical observable over an output quantum state of the quantum computation using the determined set of symmetry operators, wherein the physical observable corresponds to the result of the quantum computation; and determining a corrected result of the quantum computation using the measured projective correction of the physical observable.
-
-
-
-
-
-
-
-
-
Search Results
23
records
(took 0.017 seconds)
