268 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.

Methods and systems for quantum error correction on a quantum computer are provided. A quantum computer may comprise syndrome qubits, data qubits, and a plurality of quantum gates acting on the syndrome qubits and the data qubits.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for detecting errors in a computation performed by a quantum computer. In one aspect, a method comprises obtaining error correction data for each of a plurality of time steps during the computation; initializing a decoder state; and for each of a plurality of updating time steps, wherein each updating time step corresponds to one or more of the time steps: generating an intermediate representation; and processing a time step input through a Transformer neural network to update the decoder state for the updating time step. The method comprises generating a prediction of whether an error occurred in the computation from the decoder state for the last updating time step of the plurality of updating time steps.

The invention discloses a quantum router for an ultra-secure communication network, and relates to the technical field of quantum communication and networks. The system comprises a quantum key distribution module which is used for generating and distributing quantum keys between two communication parties, and is used for encrypting and decrypting transmitted information; the quantum entanglement state generation and management module is used for generating and managing quantum entanglement pairs and supporting transmission and management of the quantum entanglement pairs among different network nodes; the quantum routing module is used as a core processing unit of the system and is responsible for analyzing the received quantum information and selecting an optimal transmission path according to a preset algorithm; the quantum error correction and protection module is used for applying a quantum error correction code and a quantum state protection mechanism in the information transmission process to prevent the quantum state from being damaged by external environment and equipment defect interference; and the classic control channel module is used for transmitting classic control signals, cooperating with routing and management of the quantum information, and providing a feedback mechanism to realize real-time monitoring and dynamic adjustment of the quantum information transmission process.

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.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for detecting errors in a computation performed by a quantum computer. In one aspect, a method comprises obtaining error correction data for each of a plurality of time steps during the computation; initializing a decoder state; and for each of the plurality of time steps: generating an intermediate representation; and processing a time step input through a Transformer neural network to update the decoder state for the time step. The method comprises generating a prediction of whether an error occurred in the computation from the decoder state for the last time step of the plurality of time steps.

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.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for detecting errors in a computation performed by a quantum computer. In one aspect, a method comprises obtaining error correction data for each of a plurality of time steps during the computation; and processing a respective input for each of a plurality of updating time steps using one or more machine learning decoder models to generate a prediction of whether an error occurred in the computation, wherein each updating time step corresponds to one or more of the time steps and wherein the respective input for each of the plurality of updating time steps is generated from the error correction data for the corresponding one or more time steps.

The invention discloses a hidden quantum communication method based on a quantum error correction code. The method comprises the following steps: a sender and a receiver generate keys and appoint the quantum error correction code and a hash function; the sender encodes coverage information and hidden information to obtain a coverage message and a hidden message, the Hash function values of the hidden message and the hidden information are embedded into the coverage message and rotated, and the coverage message is sent to the receiver to become a coverage disturbance message; the receiver obtains a hidden disturbance message and the Hash function value through unwinding, decodes the hidden disturbance message and the coverage disturbance message to obtain hidden disturbance information and original coverage information, and compares the disturbance Hash function value of the hidden disturbance information with the Hash function value to decide whether to give up communication; and the receiver calculates a concealment standard to judge whether the communication is concealed or not. According to the method, the problem of using the quantum depolarization channel to carry out covert communication is solved, and the detection of attack behaviors and higher accuracy are realized.

Methods, systems, and apparatus for enhanced decoding using in-phase and quadrature information. In one aspect, a method includes obtaining in-phase and quadrature values for multiple measurement operations in a quantum error correction code for a quantum computation; classifying measurement outcomes of the multiple measurement operations using respective in-phase and quadrature values; generating a detector graph of nodes and edges, wherein the detector graph labels detection events that occur in the classified measurement outcomes; assigning weights to the edges of the detector graph using posterior probability distributions of the classified measurement outcomes to generate a weighted detector graph; and executing a decoding process on the weighted detector graph to compute a decoding output of the decoding process, wherein the decoding output predicts an occurrence of errors in the quantum computation.

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.

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.

There is described an improved method of ordered statistics decoding where a decoder generates a sparse matrix having a rank of r based on input stabilizer data and error probability weights. The sparse matrix includes a first sub-matrix defined as the r linearly independent columns of the sparse matrix. A transformation matrix, having the same size as the first sub-matrix, is initialized and updated with one or more linear transformations generated based on a transformation vector determined as a dot product of the transformation matrix and a non-zero column of the sparse matrix. An estimated error, which can be utilized to perform error correction, is determined based on the updated transformation matrix.

The disclosure provides a scalable fault-tolerant measurement-based quantum computing (MBQC) system that includes multiple source modules operably connected to multiple optical circuits through multiple optical connections. The source modules are configured to generate resource states that are stitched together by the optical circuits to generate a higher-dimensional multimode entangled state. The source modules, optical circuits, and optical connections can be configured into repeatable tiles, where each tile comprises a subset of the source modules, optical circuits, and optical connections. The optical circuits are further configured to perform projective measurements on the multimode entangled state, such that a variety of quantum error correction codes may be implemented.

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.

Technologies for resource-efficient quantum error correction are disclosed. A quantum computer may include physical gate qubits, capable of general quantum gate operations such as single-qubit operations and nearest-neighbor two-qubit operations. Each physical qubit gate may be controllably coupled to a quantum memory. The quantum memory may have a lower per-gate error rate than the physical qubit gates as well as a lower per-qubit cost. Because errors accrue at a lower rate in the quantum memory, the physical gate qubits may be able to perform error correction for a large number of logical qubits in the quantum memory, even if the physical gate qubits have an error rate relatively close to an error threshold.

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.

According to various embodiments of the present disclosure, the provided operation method of a first node in a communication system comprises the steps of: receiving at least one synchronization signal from a second node; receiving control information from the second node; determining one of two entanglement distillation protocols (EDPs) by using a predicted resource usage amount based on an initial fidelity and a target fidelity shared in advance with the second node, the two EDPs including a quantum error correcting codes (QECCs)-based EDP and a quantum private authentication (QPA) protocol; determining one or more parameters related to the EDP on the basis of the initial fidelity and the target fidelity by using an EDP parameter table shared in advance with the second node; performing the EDP on the basis of the one or more parameters; and, on the basis of the EDP result, preserving one or more Einstein-Podolsky-Rosen (EPR) states related to the EDP result, or discarding the one or more EPR states related to the EDP result and repeating the EDP.