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公开(公告)号：WO2023064369A1
公开(公告)日：2023-04-20
申请号：PCT/US2022/046419
申请日：2022-10-12
Applicant: RIGETTI & CO, LLC
Inventor： SETE, Eyob , KULSHRESHTHA, Shobhan
Abstract: In a general aspect, iSWAP gates are calibrated on a superconducting quantum processing unit. In some aspects, initial values of control parameters to apply the iSWAP gate on a pair of qubits defined by first and second qubit devices of the superconducting quantum processing unit are identified. Phase tracking devices associated with the first and second qubit devices of the superconducting quantum processing unit are initialized. After initiating the phase tracking devices, shifts in local phases of the pair of qubits are determined based on one or more applications of the iSWAP gate to the pair of qubits. The one or more applications of the iSWAP gate to the pair of qubits is performed using the initial values of the control parameters. Updated values of one or more of the control parameters are generated based on the shifts in local phases and outputs of the phase tracking devices.
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公开(公告)号：WO2023282979A2
公开(公告)日：2023-01-12
申请号：PCT/US2022/029756
申请日：2022-05-18
Applicant: IONQ, INC.
Inventor： MAKSYMOV, Andrii , NGUYEN, Jason Hieu Van , MARKOV, Igor Leonidovich , NAM, Yunseong
Abstract: A method of performing computation using a hybrid quantum-classical computing system including a classical computer, a system controller, and a quantum processor includes identifying a computational problem to be solved and a quantum algorithm to be used to solve the computational problem, detecting one or more faulty two-qubit gates among a plurality of two-qubit gates that can be applied to pairs of qubits in the quantum processor, compiling a computational task to solve the computational problem based on the quantum algorithm into a series of logic gates, including single-qubit gates and two-qubit gates that exclude the detected one or more faulty two-qubit gates, executing the series of logic gates on the quantum processor, measuring one or more of the qubits in the quantum processor, and outputting a solution to the identified computational problem derived from the measured results of the one or more of the qubits in the quantum processor.
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公开(公告)号：WO2023277986A1
公开(公告)日：2023-01-05
申请号：PCT/US2022/024317
申请日：2022-04-12
Applicant: MICROSOFT TECHNOLOGY LICENSING, LLC
Inventor： HAAH, Jeongwan
IPC: G06N10/70
Abstract: Embodiments of the present disclosure include systems and methods for magic state distillation. A first matrix is generated based on a collection of indices that reference a second matrix. A set of compressed Clifford gates is determined based on the first matrix. The set of compressed Clifford gates is applied to a set of the qubits of a quantum processor. A set of magic states of the quantum processor are obtained as a result of application of the set of compressed Clifford gates. The quantum processor may be configured based on the magic states obtained.
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公开(公告)号：WO2022255238A1
公开(公告)日：2022-12-08
申请号：PCT/JP2022/021695
申请日：2022-05-27
Applicant: 三菱電機株式会社 , 日本電信電話株式会社
IPC: G06N10/70
Abstract: 結果確認部（２０４）が、量子状態が格納された状態空間を検証対象装置（３００）が正しく準備しなかった確率である状態空間確率と、検証対象装置（３００）がパウリＺ測定及びパウリＸ測定を正しく行わなかった確率であるパウリ測定確率と、ＣＣＺのマジック状態を検証対象装置（３００）が生成しなかった確率であるマジック状態確率を算出する。そして、結果確認部（２０４）は、状態空間確率とパウリ測定確率とマジック状態確率とを用いて、検証対象装置（３００）での量子状態とＣＣＺのマジック状態との近似度及び検証対象装置（３００）での量子状態に対するパウリＺ測定及びパウリＸ測定の測定精度を算出する。
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公开(公告)号：WO2022128868A1
公开(公告)日：2022-06-23
申请号：PCT/EP2021/085401
申请日：2021-12-13
Inventor： ZHU, Guanyu , CROSS, Andrew
IPC: G06N10/70
Abstract: Systems, computer-implemented methods, and computer program products to facilitate logical Hadamard gate operation and gauge fixing in subsystem codes are provided. According to an embodiment, a system can comprise a processor that executes computer executable components stored in memory. The computer executable components can comprise a gauge fixing component that applies a gauge fixing operation to a subsystem code of an encoded qubit to generate a switched subsystem code. The computer executable components can further comprise a transverse component that applies a transversal Hadamard operation to the switched subsystem code to generate a rotated subsystem code.
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Patent Agency Ranking
公开(公告)号：WO2022103945A1
公开(公告)日：2022-05-19
申请号：PCT/US2021/058958
申请日：2021-11-11
Applicant: GOOGLE LLC
Inventor： HUGGINS, William , MCCLEAN, Jarrod Ryan
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.
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公开(公告)号：WO2022039818A2
公开(公告)日：2022-02-24
申请号：PCT/US2021/035940
申请日：2021-06-04
Applicant: THE UNIVERSITY OF CHICAGO
Inventor： JIANG, Liang , ROZPEDEK, Filip D. , NOH, Kyungjoo
Abstract: Quantum repeaters and network architectures use two concatenated quantum error correction codes to increase the transmission range of quantum information. A block of data qubits collectively encode a second-layer logical qubit according to a second-layer code concatenated with a first-layer code. A first-layer quantum repeater first-layer corrects each data qubit based on a first-layer syndrome extracted therefrom. The first-layer quantum repeater transmits these first-layer-corrected qubits to a second-layer quantum repeater via a quantum communication channel. The first-layer quantum repeater also transmits the first-layer syndromes to the second-layer quantum repeater via a classical communication channel. After extracting a second-layer syndrome from the first-layer-corrected qubits, the second-layer quantum repeater uses the first-layer syndromes and second-layer syndrome to second-layer correct the first-layer-corrected qubits. The first-layer syndromes improve quantum error correction by reducing the number of second-layer stabilizer measurements needed to determine which data qubits have an error.
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8.发明申请
公开(公告)号：WO2023033972A1
公开(公告)日：2023-03-09
申请号：PCT/US2022/039171
申请日：2022-08-02
Applicant: INTEL CORPORATION
Inventor： SCHMITZ, Albert , MATSUURA, Anne , PILLARISETTY, Ravi , PREMARATNE, Shavindra , HOGABOAM, Justin , LAMPERT, Lester
Abstract: Apparatus and method for measurement-free (MF) quantum error correction (QEC). For example, one embodiment of a method comprises: determining an error syndrome on a first subset of ancilla qubits of a quantum processor; decoding the error syndrome to produce decoded results on a second subset of ancilla qubits of the quantum processor; applying the decoded results to one or more system qubits; and unconditionally resetting the first subset and/or second subset of ancilla qubits to remove entropy and/or noise from the quantum system, wherein the operations of determining the error syndrome, decoding the error syndrome, applying the error syndrome, and unconditionally resetting the first and/or second subset of ancilla qubits are performed responsive to a qubit controller executing quantum control instructions provided from or derived from a script and without transmitting measurement data related to the error syndrome to a non-quantum computing device.
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公开(公告)号：WO2023278025A1
公开(公告)日：2023-01-05
申请号：PCT/US2022/029663
申请日：2022-05-17
Applicant: MICROSOFT TECHNOLOGY LICENSING, LLC
Inventor： HASTINGS, Matthew , HAAH, Jeongwan
IPC: G06N10/70
Abstract: A quantum error correcting code with dynamically generated logical qubits is provided. When viewed as a subsystem code, the code has no logical qubits. Nevertheless, the meaurement patterns generate logical qubits, allowing the code to act as a fault-tolerant quantum memory. Each measurement can be a two-qubit Pauli measurement.
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公开(公告)号：WO2022259128A1
公开(公告)日：2022-12-15
申请号：PCT/IB2022/055270
申请日：2022-06-07
Inventor： HACOHEN-GOURGY, Shay , DIRINGER, Asaf A.
Abstract: A method for displacement of an electromagnetic mode (EM) conditioned on the state of an ancilla qubit, the method may include displacing, by applying a displacement operation, an EM mode whose frequencies are conditioned on the state of the ancilla qubit and are spaced apart by a frequency difference, by providing a displacement signal having a bandwidth that exceeds the frequency difference and has a zero amplitude at one or more of the frequencies of the electromagnetic mode which are defined by the displacement operation not to be displaced and a non-zero amplitude at one or more frequencies of the mode which are defined by the displacement operation to be displaced.
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