222 results about "Quantum error correction" patented technology

The invention discloses a power monitoring system host security micro-isolation method and system, particularly relates to the technical field of power terminal security isolation, and aims to monitor electromagnetic interference and quantum state changes in real time and improve the stability and security of a quantum key distribution process in combination with quantum error correction and dynamic prediction technologies. A high-confidentiality encryption key is generated through the randomness of a quantum key generator, the interference level is monitored in real time in a high electromagnetic interference environment, a security protocol is automatically triggered, and parameters of a quantum system are adjusted through an active feedback mechanism; a dynamic Bayesian network is utilized to predict entanglement attenuation of a quantum state, an information exchange behavior of a quantum system is analyzed through quantum entanglement entropy, the attenuation degree and interaction intensity of the quantum state are comprehensively analyzed, and a dynamic micro-isolation strategy is implemented according to an analysis result; the reliability of quantum key distribution is improved, and the anti-interference capability of a power monitoring system in a complex electromagnetic environment is enhanced.

A method for quantum error correction includes: trapping and / or manipulating an array of qubits that include encoded neutral atoms or ions and forms a computational space; encoding the array of qubits to a state characterized in that an error during at least one of an idling, gate, or other operation results in a respective qubit transition to a disjointed state where that error can be detected without disturbing the qubits remaining in the computational space; performing a syndrome measurement of a quantum error correcting code; identifying the presence and location of an error by detecting the corresponding neutral atom or ion has left the computational space after performing the operation; identifying a logical error in the quantum error correcting code associated with a loss of qubit information based on the identified error location and results of the syndrome measurement; and adjusting subsequent computational steps based on the identified logical error.

The invention discloses a quantum measurement and control data processing method and device, and belongs to the technical field of data processing.The quantum measurement and control data processing method and device comprises the following specific steps that firstly, wavelet packet decomposition is conducted on an original measurement signal through a quantum noise feature extraction module, and a quantum noise feature extraction module is obtained; carrying out matched filtering with a preset quantum noise fingerprint database; and 2, performing quantum state reconstruction on the filtered signal by adopting a compressed sensing algorithm, wherein a measurement matrix is dynamically generated according to the Hamiltonian of a quantum system. Through combination of wavelet packet decomposition (time-frequency locality) and a dynamic measurement matrix (Hamiltonian relevance), compared with a traditional Fourier method, quantum state reconstruction errors are greatly reduced, time sequence dependence is captured through an LSTM network, physical legality is guaranteed through a quantum main equation, control parameter speed is optimized, 2ns-level time sequence precision is achieved through an FPGA segmentation correction algorithm, and the method has the advantages of being simple in structure, convenient to operate and high in practicability. And the real-time requirement of the quantum error correction code is met.

The invention discloses a defect-free neutral atom array preparation method and system based on dynamic optical tweezers rearrangement, and belongs to the technical field of quantum computing. The invention discloses a defect-free neutral atom array preparation method and system based on dynamic optical tweezers rearrangement. A static optical tweezers array is generated through a spatial light modulator to capture initial atoms, an optimal rearrangement path is planned by adopting a Hungary algorithm, and dynamic optical tweezers are generated through an acousto-optic deflector to implement atom grabbing, moving and releasing operation. According to the method, a weighted Gerchberg-Saxton algorithm is innovatively combined with real-time image feedback, so that the precise rearrangement of the atom array is realized. Important experimental technical support is provided for quantum calculation and simulation, and the application progress of the neutral atom array in the fields of quantum error correction, fault-tolerant quantum calculation, quantum simulation and the like is effectively promoted.

Scalable, parallelizable quantum error correction on surface codes can be performed using a decoder graph. Overlapping decoder graph windows can be generated using the decoder graph. First corrections can be independently determined for each of the overlapping decoder graph windows. First core corrections can be retained for core regions of each of the overlapping decoder graph windows. Non-overlapping decoder graph windows can be generated using the decoder graph. The temporal boundaries of the non-overlapping decoder graph windows can be the temporal boundaries of the corrected core regions of the overlapping decoder graph windows. Second corrections can be independently determined for each of the non-overlapping decoder graph windows based on the temporal boundaries of the corrected core regions. The first core corrections and the second corrections can be combined to form a complete set of corrections for the decoder graph.

Techniques are described for implementing a class of multimode bosonic codes that protect against errors within an ancilla qubit coupled to a bosonic system, that can be realized experimentally. A logical qubit state is represented by the states of multiple different modes of one or more bosonic systems, which may include multiple modes of a single bosonic system and / or single modes from multiple bosonic systems. Techniques for correcting errors are also described. In particular, a series of operations are described that autonomously detect and correct errors by repeatedly performing a sequence of operations that are each applied to the multiple bosonic modes and / or to the ancilla qubit that is coupled to each of the bosonic modes. The codes allow ancilla errors to propagate to the modes of the bosonic system as correctable errors, where they can be corrected, instead of presenting as logical errors in the ancilla qubit.

The invention discloses an intelligent equipment management and monitoring method based on the Internet of Things. The method comprises the following steps: S1, collecting and preprocessing equipment state data through a quantum sensor; s2, constructing a quantum sensing network, and dynamically optimizing a network topology structure by using a quantum entanglement technology; s3, mapping the equipment state data into a quantum state, and optimizing time delay and spatial distribution in a data transmission process through quantum superposition and quantum interference technologies; s4, correcting error data in the transmission process by adopting a quantum error correction algorithm, and encrypting the corrected data through a quantum key distribution technology; s5, predicting the state of the equipment, and fusing a prediction result with the encrypted data to form a management instruction; s6, executing the management instruction and adjusting the equipment management strategy; and S7, monitoring the running state of the equipment in real time and updating the management instruction. The method has the advantages of high efficiency, accuracy, safety and high adaptability, and the equipment operation and maintenance efficiency is improved.

A method for operating a quantum computer with a set of qubits is disclosed. A quantum algorithm redundantly encodes quantum information in each physical qubit. Each physical qubit redundantly encodes the quantum information. The set of physical qubits is employed to form a set of logical qubits. Each logical qubit is formed via a separate subset of the physical qubits. Each logical qubit redundantly encodes the quantum information. Each separate subset of physical qubits is disjoint from each other separate subset of physical qubits. A first quantum error correction (QEC) code is performed on each logical qubit. The first QEC code detects a first set of parity conditions across the separate subset of physical qubits forming the logical qubit. A second QEC code may be performed on the set of logical qubits. The second QEC code detects a second set of parity conditions across the set of logical qubits.

The invention discloses a superconducting quantum measurement and control microcontroller and measurement and control system based on an extended instruction set, and relates to the technical field of quantum computing, and the superconducting quantum measurement and control microcontroller comprises a state machine which is used for controlling system operation and managing the execution sequence and state switching of instructions; the assembly line is of a four-step two-stage assembly line structure, a current instruction is sequentially subjected to instruction fetching, decoding, execution and write-back stages, instruction fetching of a next instruction is started to be executed in the write-back stage, and each instruction is completed in three clock periods; the code word transmitting instruction is used for generating a control pulse signal of the superconducting quantum bit; the time sequence control instruction is matched with the time delay module and is used for controlling a time interval in quantum bit operation; the feedback transmitting instruction is used for adjusting the state of the quantum bit in real time according to the feedback signal and supporting quantum error correction; according to the superconducting quantum measurement and control microcontroller and the measurement and control system, efficient and low-delay quantum bit control and real-time feedback are realized.

A quantum computing device according to an aspect of the present disclosure includes an ion trap chip including direct current (DC) electrodes and radio frequency (RF) rails to form a plurality of horizontal traps and one or morevertical traps, and a controller configured to trap ions by controlling the ion trap chip, adjust positions of the ions, and apply laser beam to the ions to perform gate operations. The controller performs traversal gate operations between qubits arranged in the horizontal trap area based on qubit connectivity of only qubits trapped in the same horizontal trap, moves the qubits arranged in the horizontal trap area to the vertical trap adjacent to the horizontal trap area through parallel shuttling, perform quantum error correction, and continues traversal gate operations after shuttling to an adjacent horizontal trap area through parallel shuttling.

A method for operating a quantum error correction (QEC) code on a quantum computing system (QCS) is disclosed. The QCS includes a set of qubits and a set of couplers. An indication of a set of dropouts is received. Each dropout corresponds to a qubit that is non-functional or a coupler that is non-functional. The dropouts define a set of non-functional qubits, a set of functional qubits, a set of non-functional couplers, and a set of functional couplers. The QEC code is generated based on a set of heuristics, the set of functional qubits, and the set of functional couplers. The QEC code operates on the functional qubits. Each functional coupler provides a coupling between a pair of functional qubits. A quantum algorithm is executed that includes employing the QEC code to protect a set of logical qubits formed by the first subset of functional qubits from logical errors.

The invention discloses a quantum error correction code decoding method, system and terminal based on momentum belief propagation, and the method comprises the steps: representing a prior message of the occurrence probability of each type of Follicle error of each quantum bit through a log-likelihood ratio, and obtaining an initialization message according to a prior probability vector, and updating messages transmitted to all adjacent variable nodes by the check node according to the initialization message to obtain an updated horizontal message, performing dynamic message updating on the posterior message of each variable node according to the updated horizontal message and the historical message to obtain an updated posterior message, and performing dynamic message updating on the posterior message of each variable node based on the updated horizontal message and the posterior message. And calculating an updated vertical message through a fixed suppression method, obtaining estimation of a real error according to a posterior message, and outputting a result. According to the method, a momentum item is introduced into message updating, a decoding algorithm based on momentum message propagation is obtained, and the decoding precision and the convergence rate of decoding on high-degenerate quantum codes are greatly improved.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for detecting errors in computations executed by a quantum computer. In one aspect, a method includes obtaining error correction data for each of a plurality of time steps during the calculation; and processing a respective input for each of a plurality of update time steps using one or more machine learning decoder models to generate a prediction of whether an error has occurred in the computation, where each update time step corresponds to one or more of the time steps, and where each update time step corresponds to one or more of the time steps. The respective input for each of the plurality of updated time steps is generated from the error correction data for the corresponding one or more time steps.

The present invention is related to a quantum computing arrangement comprising a plurality of qubits, to a quantum computing system comprising a plurality of said quantum computing arrangements, to a method of implementing, on a quantum computing system, a quantum error correction code, said quantum computing system comprising the quantum computing arrangement, and to the use of a quantum computing system or a quantum computing arrangement for implementing a quantum error correction code.

A quantum computing system comprises a classical computing entity, a controller, and a quantum processor. The controller is configured to control operation of the quantum processor and communicate with the computing entity. The controller causes performance of syndrome circuit segments to generate syndromes of logical qubits. The syndrome circuit segment is performed at least partially by causing performance of a sequence of transportation operations and at-least-two-physical-qubits interactions. Each transportation operation of the sequence causes physical transport of at least one of a respective data qubit of the logical qubit or a respective ancilla qubit into a respective interaction zone defined by the quantum processor. A respective at-least-two-physical-qubits interaction is performed within the respective interaction zone. Using the syndrome, at least one quantum error correction is determined; and the controller causes a classical memory to be updated based on the syndrome and / or the quantum error correction.

A decoder apparatus for decoding syndrome data of a quantum error correction code is disclosed. The decoder apparatus is configured to receive position data representing the respective location of defects from the syndrome data in a decoding graph. The decoder apparatus also receives dimension data of the decoding graph and determines the respective location of each of the plurality of defects in the decoding graph based on the position data and the dimension data. The decoder apparatus then decodes the syndrome data using the determined respective location of each of the plurality of defects.

Correcting quantum errors based on quantum error correction caches (QECCs) is disclosed herein. In one example, a processor device of a quantum computing device is to receive an indication of an occurrence of a quantum error that affects a qubit. The processor device identifies a QECC entry within a plurality of QECC entries of a first QECC of the quantum computing device, wherein the QECC entry corresponds to a previous occurrence of the quantum error. The processor device obtains metadata associated with the previous occurrence of the first quantum error from the QECC entry, and determines a corrective action based on the metadata. The processor device performs the corrective action to remedy the quantum error.

A computing system is provided, including one or more processing devices configured to receive an extended stabilizer form of a quantum error correction code. The one or more processing devices are further configured to receive a logical Clifford operation specification of a logical Clifford operation. Based at least in part on the extended stabilizer form, the one or more processing devices are further configured to compute a stabilizer tableau of the quantum error correction code. Based at least in part on the stabilizer tableau and the logical Clifford operation specification, the one or more processing devices are further configured to compute a physical representation matrix of the logical Clifford operation. The one or more processing devices are further configured to output the physical representation matrix.

A method for decoding qubit errors of a quantum computing system that implements a quantum error correction (QEC) code is disclosed. Qubits are subject to a set of error types including a set of non-decomposable error types and a set of decomposable error types. An initial matching graph (MG) is generated based on the non-decomposable error types. The initial MG includes a set of nodes and a set of non-decomposable edges. Non-decomposable edges are associated with non-decomposable error types occurring on qubits. A set of decomposable potential-edges is generated based on the decomposable error types. Decomposable potential-edges are associated with decomposable error types occurring on qubits. An updated MG is generated by applying a local-connectivity test to each decomposable potential-edge. The updated MG includes the set of nodes and a set of updated edges including the set of non-decomposable edges and a set of decomposable edges.

The invention discloses a multi-view modeling data fusion device, and relates to the technical field of data processing, and the device comprises the following components: a quantum entanglement module, data coding and modulation, quantum communication and synchronization, and fusion algorithm and processing. Through combination of quantum entanglement, quantum communication and an advanced fusion algorithm, efficient and accurate fusion of multi-view data is realized, the device can realize nearly real-time data transmission and synchronization by utilizing the over-distance effect of quantum entanglement, the timeliness of data fusion is remarkably improved, and meanwhile, the real-time performance of the device is improved. By introducing a quantum error correction mechanism and an advanced fusion algorithm, the device can effectively reduce the error rate in the data transmission process, the accuracy and reliability of a fusion result are ensured, and powerful technical support is provided for constructing a more comprehensive and accurate multi-view model.

To improve the performance of quantum error correction and provide large-scale and stable quantum computing.SOLUTION: A computer provides implementation of qubits using neutral atom arrays, quantum error correction via surface codes, high-performance error decoding through correlation decoding, and optimized syndrome extraction. Specifically, reconfigurable neutral atom array architecture, high-speed decoding using the belief-HUF algorithm, efficient implementation of transversal gates, and dynamic adjustment of syndrome extraction rounds are included.SELECTED DRAWING: None

The disclosure is directed to a method performed during an execution of a quantum algorithm, via a quantum computing system (QCS) that includes a set of qubits and a set of classical processor devices. The quantum algorithm includes a quantum error correction (QEC) code that includes a set of qubit measurements over the set of qubits. Prior to the execution of the QA, the classical processor devices generate a matching graph (MG). During the execution of the quantum algorithm, the following operations are interleaved. A current subset of qubit measurements is performed. The qubit measurements are based on the QEC code. The classical processor devices update the MG based on values of the current subset of qubit measurements. The set of classical processor devices decodes one or more qubit errors based on the updated MG.

Methods for determining physical representations of logical operators of QEC codes involve obtaining a description of a logical operator associated with a predetermined QEC code. The QEC code is configured for encoding logical qubits on physical qubits. The logical operator corresponds to an operation to be performed on at least one of the logical qubits. A first physical representation of the logical operator acts on at least one of the physical qubits. A set of diagonal Clifford stabilizer generators is obtained. Each diagonal Clifford stabilizer generator transforms the first physical representation of the logical operator into another physical representation of the same logical operator. A second physical representation of the logical operator is determined, using a closest vector problem, CVP, algorithm. The CVP algorithm is performed on the first physical representation. The second physical representation of the logical operator comprises a plurality of phase gates and / or controlled-Z gate.

Disclosed herein is a computer-implemented quantum error correction method for decoding errors in a quantum computer system. The quantum computer system comprises a decoder apparatus and a register of quantum devices. The method comprises receiving, at the decoder apparatus, syndrome data in an initial state, the syndrome data being representative of an error state of the quantum devices in the register of quantum devices, and graph data representative of a graph comprising a plurality of error nodes and a plurality of check nodes. The error nodes represent error mechanisms that can occur on the register of quantum devices. Each check node is associated with one or more measurements which can be performed on the register of quantum devices. The initial state of the syndrome data indicates a check value of marked or unmarked for each check node based on an outcome of its associated one or more measurements. The method further comprises determining, based on a statistical model of error rates associated with the error mechanisms, an error probability associated with each of the one or more error nodes; and generating modified graph data by iteratively performing linear operations on the graph data and syndrome data based on a current state of the syndrome data to determine an independent error node associated with each marked check node. The method also comprises determining, by the decoder apparatus, a correction for the error state based on the modified graph data and, optionally, based on the error probabilities associated with the one or more error nodes.

The disclosure is directed to a method performed during an execution of a quantum algorithm, via a quantum computing system (QCS) that includes a set of qubits and a set of classical processor devices. The quantum algorithm includes a quantum error correction (QEC) code that includes a set of qubit measurements over the set of qubits. Prior to the execution of the QA, the classical processor devices generate a matching graph (MG). During the execution of the quantum algorithm, the following operations are interleaved. A current subset of qubit measurements is performed. The qubit measurements are based on the QEC code. The classical processor devices update the MG based on values of the current subset of qubit measurements. The set of classical processor devices decodes one or more qubit errors based on the updated MG.

A method for synthesizing Boolean circuits for an error correction decoder. The method may include: providing one or more input binary variables derived from one or more syndrome measurements; providing a mapping representative of a quantum error correction decoder; for said one or more input binary variables providing corresponding output binary variables representative of one or more recovery operations for qubits, wherein said output binary variables are generated using said mapping; and using said one or more input binary variables and said corresponding output binary variables to synthesize at least one Boolean circuit. A quantum error correction decoder chip comprising one or more Boolean circuits.

Transformer neural network based decoder for decoding Quantum Error Correction Codes (QECC), comprising, an input layer, a plurality of decoding layers, and an output layer. The input layer is adapted to receive initial noise estimation computed by a noise estimator for noise injected to syndrome bits of codewords encoded using QECC and transmitted over transmission channel(s) subject to interference, and create embeddings for the syndrome bits. The decoding layers adapted to compute an estimated logical operator matrix of each codeword, each comprises a self-attention layer constructed according to a mask indicative of a relation between the embeddings derived from a parity-check matrix of the error correction code. The plurality of decoding layers are trained using a combined loss function directed to minimize LER, BER, and error rate of the noise estimator. The output layer is adapted to produce a vector representing predicted soft error of the codeword's logical operator matrix.

A quantum computing system and a method of performing a quantum error correction code are disclosed. A determination is made that a leakage event has occurred at a quantum device. A plurality of decoding hypergraph hyperedges potentially affected by the leakage event are determined. The plurality of decoding hypergraph hyperedges are adjusted in accordance with the leakage event.

The present application provides a communication method, a storage medium, and an electronic device. The communication method comprises: generating a control pulse on the basis of a user instruction, and sending the control pulse to a quantum computer; sending a read pulse to the quantum computer, so that the quantum computer generates a reflected pulse; receiving the reflected pulse sent by the quantum computer; and obtaining the state of qubits on the basis of the phase difference between the control pulse and the reflected pulse. According to the communication method, the state of qubits can be determined in real time, thereby providing a foundation for quantum error correction and other algorithms.

A method and apparatus for decoding syndromes of a quantum error correction code is disclosed. The method includes the steps of receiving syndrome data for a plurality of quantum error correction rounds performed on a plurality of qubits; identifying a plurality of first blocks within the syndrome data, wherein each first block has a respective first central block surrounded by one or more respective first buffer blocks; decoding each first block to obtain a first committed correction for each respective first central block; identifying a plurality of second blocks within the syndrome data, wherein each second block comprises at least part of at least one first buffer block; and decoding each second block to obtain a second committed correction for each second block. An apparatus including a plurality of block decoders and a process manager is disclosed.