217 results about "Quantum system" patented technology

The invention discloses an image classification method based on an extensible quantum convolutional neural network, and relates to the technical field of image classification, and the method comprises the steps: carrying out the preprocessing of to-be-classified image data, and then carrying out the slicing processing; converting the slice data into quantum state information through angle coding; a quantum system is constructed, the quantum system comprises a quantum feature extraction part and a quantum classification measurement part, the quantum feature extraction part comprises a quantum variational circuit model with a quantum convolutional layer, and the model can perform feature extraction on quantum state information by using alternating single quantum bit gates and double quantum bit gates; training a quantum variational circuit model by using a part of quantum state information; and inputting the other part of quantum state information into the trained quantum variational circuit model, and measuring the output quantum state of the quantum variational circuit model. According to the method, the problems that traditional deep learning is high in computing resource demand, limited in quantum computer scale and the like are solved, and a novel and practical method is provided for efficient image classification.

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.

Methods, systems and apparatus for simulating quantum systems. In one aspect, a method includes the actions of obtaining a first Hamiltonian describing the quantum system, wherein the Hamiltonian is written in a plane wave basis comprising N plane wave basis vectors; applying a discrete Fourier transform to the first Hamiltonian to generate a second Hamiltonian written in a plane wave dual basis, wherein the second Hamiltonian comprises a number of terms that scales at most quadratically with N; and simulating the quantum system using the second Hamiltonian.

Quantum-classical gradient estimation is described for use in determining a value of at least one optimizable parameter of an objective function. An optimization method can be performed by a digital processor coupled to an analog processor and can include, until the objective function converges: obtaining a set of samples generated by the analog processor; estimating a gradient of the objective function based on a current value of the at least one optimizable parameter and the set of samples; determining first and second order moments based on the estimated gradient, and, updating the optimizable parameters based on the moments. A method to train a machine learning data can include: receiving a training data set; generating a training model having an objective function; performing acts of the optimization method to optimize parameters of the training model; and, returning the optimized training model to the machine learning model.

The invention provides a neural network prediction method and device for two-dimensional quantization vortex dynamics, and the method comprises the following steps: S1, determining a two-dimensional vortex dynamics equation for a to-be-predicted flow field, and converting the two-dimensional vortex dynamics equation into a Schrodinger equation of a quantum system; s2, obtaining wave function evolution data of the quantum system according to a Schrodinger equation, and generating a wave function data set; s3, constructing a full-connection layer neural network model, and performing phase integration on the full-connection layer neural network model; s4, introducing a normalization factor into the full-connection neural network model; s5, training the full connection layer neural network model by using the wave function data set; s6, performing wave function prediction according to a given initial value by using the trained full-connection layer neural network model; and S7, converting the predicted wave function into flow field evolution. According to the method provided by the invention, the conservation law of the system can be ensured in the prediction of the Schrodinger system, so that the flow field prediction precision can be ensured in a long time period.

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 relates to a method and a device (100) for generating a useful signal (11) from a signal (5') emanating from a spin-based quantum system (4), comprising exciting the spin-based quantum system (4) by an electromagnetic field (3) which oscillates between two states at a modulation frequency, detecting the signal (5') emanating from the spin-based quantum system (4) to obtain a measurement signal (7), multiplying the measurement signal (7) with a modulation signal (9) which oscillates between two modulation signal states at the modulation frequency to generate a modulated measurement signal (7'), and demodulating the modulated measurement signal (7') to generate the useful signal (11).

The invention relates to a method and a device for evaluating a measurement signal emanating from a spin-based quantum system, comprising exciting the spin-based quantum system by a pulsed excitation light (320), detecting the measurement signal emanating from the spin-based quantum system, integrating the measurement signal over an integration window (331) containing a signal time of a first light pulse (322) to obtain a signal value, integrating the measurement signal over an integration window (332) containing a signal time of a second light pulse (322) to obtain a reference value, wherein the first and second light pulses are two time-displaced light pulses of the excitation light (320), and determining a measured value from the signal value and the reference value.

The invention discloses a short-path optical pulse based on a three-energy-level system, a generation method and application. Specific forms of Hamiltonian and Rabian frequency parameters thereof are constructed in a three-level quantum system, and the parameters are optimized to obtain a light pulse which enables an evolution path of a quantum state on a Bloch sphere to be shortest and is high in fidelity. According to the optical pulse obtained by the technical scheme, the quantum state can be changed into a target state from any initial state through a circular evolution path, and logic gate operation is executed. The evolution time of the gate can be effectively shortened through the circular evolution trajectory, and the quantum gate reduces the influence of environmental noise while keeping the robustness of the control error. According to the quantum logic gate, multi-parameter optimization is carried out on the optical pulse waveform, the quantum logic gate is suitable for a rare earth ion Pr < 3 + >: Y2SiO5 quantum bit system device and an inverted-V-shaped three-energy-level system, and the high-fidelity quantum logic gate is obtained.

According to an example embodiment, a method (100) for simulating a quantum operator of a bosonic quantum system is provided, the method (100) comprising: obtaining (102) a first representation that defines the quantum operator in a first operator basis using a first sequence of expansion coefficients; transforming (104), via applying a first transformation on the first sequence of expansion coefficients, the first representation into a second representation that defines the quantum operator in a first function basis using a second sequence of expansion coefficients; decomposing (106) the second representation into a third representation that defines the quantum operator as a linear combination of terms that each comprise a sum of a product of two component functions and a residual function using the second sequence of expansion coefficients, wherein the two component functions and the residual function of each term constitute a respective independent set of functions and are represented in second function bases using a third sequence of expansion coefficients; determining (108) time-evolved values of the third sequence of expansion coefficients based on the third representation, thereby determining time-evolved independent sets of functions represented in the second function bases; and determining (110) time-evolved values of the first sequence of expansion coefficients via applying a second transformation on the second sequence of expansion coefficients and on the time-evolved third sequence of expansion coefficients to determine the time-evolved quantum operator in a second operator basis.

The invention provides a quantum system data processing method based on light quantum and a light quantum computer, and the method comprises the steps: obtaining an ordinary differential equation and the attribute information of the ordinary differential equation; according to the frequency spectrum number of the ordinary differential equation and the attribute information of the ordinary differential equation, constructing an initial light quantum circuit corresponding to the ordinary differential equation; measuring the initial light quantum circuit, and determining a target function corresponding to the initial light quantum circuit according to a measurement result; loss information of the target function is determined, whether the initial light quantum circuit is applied or not is determined according to the loss information, and if yes, the initial light quantum circuit serves as a target light quantum circuit; and performing operation on input data of the quantum system based on the target light quantum line. According to the method, the light quantum circuit expression capability can be greatly improved, and high-precision solving of the ordinary differential equation is realized.

A method of performing a quantum gate operation using a quantum system wherein the quantum system comprises two or more neutral atoms, wherein each atom of the two or more neutral atoms is configured to transition between atomic states comprising: a first hyperfine ground state of the atom, a second hyperfine ground state of the atom, a Rydberg state and at least one intermediate excited state, wherein the quantum system further comprises an interaction between the Rydberg states of the two or more neutral atoms, and wherein the method comprises:generating a pulse sequence and providing the generated pulse sequence to the two or more neutral atoms to transition the atoms between said atomic states, wherein the pulse sequence takes into account at least part of the hyperfine structure of the at least one intermediate atomic state.

Methods, systems and apparatus for performing quantum state preparation. In one aspect, a method includes the actions of defining a target quantum state of a quantum system, wherein time evolution of the quantum system is governed by a target Hamiltonian, and defining a total Hamiltonian that interpolates between an initial Hamiltonian and the target Hamiltonian, wherein the total Hamiltonian is equal to the initial Hamiltonian at an initial time and is equal to the target Hamiltonian at a final time; approximating the time evolution of the total Hamiltonian using a truncated linear combination of unitary simulations to generate a truncated time evolution operator; evolving a ground state of the initial Hamiltonian according to the truncated time evolution operator for a truncated number of time steps to generate an intermediate state; and variationally adjusting the intermediate state to determine a wavefunction that approximates the target quantum state of the quantum system.

A method includes receiving a plurality of quantum systems, wherein each quantum system of the plurality of quantum system includes a plurality of quantum sub-systems in an entangled state, and wherein respective quantum systems of the plurality of quantum systems are independent quantum systems that are not entangled with one another. The method further includes performing a plurality of joint measurements on different quantum sub-systems from respective ones of the plurality of quantum systems, wherein the joint measurements generate joint measurement outcome data and determining, by a decoder, a plurality of syndrome graph values based on the joint measurement outcome data.

The present disclosure provides a method for searching at least one locally marked element defined by marking parameters within a 2D lattice of a quantum system, wherein the quantum system is operated in discrete time and wherein the 2D lattice is arranged for supporting quantum random walks which are defined by quantum random walk parameters, the method having a pre-set time comprises the steps of calibrating the quantum system by: initializing a quantum state in the quantum system on at least one node; performing one step of the split-step quantum random walk on the quantum state; obtaining probability density information of the quantum state through overlap with eigenstates of a unitary operator; repeating previous two steps to determine quantum random walk parameters based on the highest probability in the probability density information of the quantum state. Thereafter, the method comprises the steps of searching the quantum system for the at least one marked element by: tuning the marking parameters of the at least one locally marked element; initializing a uniformly distributed quantum state on the entire quantum system; performing a plurality of split-step quantum random walks for the uniformly distributed quantum state; after the pre-set time has lapsed, converting the uniformly distributed quantum state of step vii) into an observable.

The device (1) is arranged to receive data representing a set of respective initial values of n operating parameters of the control unit on which the dynamics of the quantum system depends, a loss function and a non-zero natural number ρ less than n. A calculator (7) is arranged to determine the ρ eigenvectors corresponding respectively to the ρ largest absolute eigenvalues of the Hessian of the loss function at the initial values of the n operating parameters, and an optimizer (9) is arranged to determine a set of respective final values of the n operating parameters by optimizing the loss function in a vicinity of the set of initial values explored by linearly combining the ρ eigenvectors.

This Continuation-in-Part extends the wave-interference-based collapse model first proposed in the Modified Schrödinger Equation (MSE) framework to five foundational quantum phenomena: tunneling, entanglement, measurement collapse, time asymmetry, and the resolution of Many-Worlds interpretations.The invention models collapse as a physical consequence of interference between the observer wave and the quantum system wavefunction, characterized by a curvature-based localization mechanism. This framework enables tunable collapse control, non-binary measurement outcomes, and outcome selection through engineered interference, providing a unified physical mechanism with broad technological applications.

The invention relates to a quantum system (1) for stabilizing a cat qubit comprising: - a command circuit (5) including a microwave source (11) and a DC voltage source (13), and - a non-linear superconducting quantum circuit (3) including a non-linear element (7) comprising a Josephson junction, a first and a second resonant portions respectively having a first mode with a first resonant frequency fa and a second mode with a second resonant frequency fb. The non-linear superconducting quantum circuit (3) stabilizes a two-dimensional manifold hosting the cat qubit when: • the microwave source (11) delivers microwave radiation at a frequency equal to fb to the second resonant portion to drive the second mode, and • the DC voltage source (13) delivers DC voltage to bias the non-linear element (7), with the delivered DC voltage having a value inducing a microwave oscillation having a frequency equal to |2fa - fb|.

In methods and systems for estimating a gradient, a time-dependent unitary U and its derivative are computed with respect to a free parameter θi within a time interval for a pulse program for a quantum system, θi characterizing at least one of the pulse's shape, amplitude, phase, start time, and end time. The linear equation system ∂θ<sub2>i< / sub2>U=U*iΩ is solved for the effective generator Ω that is an element of the dynamical Lie algebra generated by the evolution under the time-dependent unitary U. Ω is decomposed into a sum of operators Pk, and the gradient of the circuit expectation value of the quantum system is computed with respect to θi for each operator Pk using a parameter-shift method. In a method for constructing a pulse program, a candidate pulse is added if its evolution generator commutes with all generators of all dynamical Lie algebras during the same time interval.

A system which includes a photon source configured to generate a spin-1 particle; an N-dimensional quantum random number generator (ND-QRNG); a processor; and a memory. The ND-QRNG includes a detector and an optical unit including: a preparation stage configured to enable certification via value indefiniteness; and a measurement stage configured to generate numbers and outcomes attained by measuring a state of a particle utilized to prepare an N-dimensional quantum system. The memory, includes instructions stored thereon, which, when executed by the processor cause the system to: generate a spin-1 particle; receive the spin-1 particle by the optical unit; generate by the optical unit a set of outcomes based on the state of the spin-1 particle; detect the set of outcomes; and output a sequence of N-ary numbers based on the detected set of outcomes.

A quantum simulation method for solving a computational problem using a solid-state quantum system, the method comprising the steps of: passing a laser through a material; in the material, evolving at least some of a plurality of atoms in a first state into at least some of a plurality of atoms in a second state upon receiving energy from the laser to form at least one exciton; selecting at least one exciton site on the material wherein the at least one exciton site is separated from a neighbouring at least one exciton site by a distance less than a Rydberg blockade radius; mapping the computational problem into a problem Hamiltonian of the solid-state quantum system; measuring at least a portion of plurality of the at least one excitons to obtain a read-out of the solid-state quantum system; and determining a solution to the computational problem from the read-out.

The present disclosure relates to a non-Hermitian quantum sensing circuit and a sensing system. The non-Hermitian quantum sensing circuit comprises at least one sensing unit, wherein the sensing unit comprises an input end, an output end, and an N-dimensional N-order quantum system cascaded between the input end and the output end, wherein N is a positive integer greater than or equal to 2, and the N-dimensional N-order quantum system is configured to form a topological adiabatic effect quantum state between the input end and the output end to receive an external disturbance signal. The present disclosure can not only have a wider range of detectable physical quantities, but also achieve a further order of magnitude improvement in sensitivity, while effectively solving the problem of unstable signal-to-noise ratio caused by the improvement in sensitivity.

In a method for influencing an operating state of a quantum system, the quantum system comprises at least one defect, defect complex or impurity in a host material. A transition between different energy levels of the at least one defect, defect complex or impurity is determined. The transition has a transition energy that is a function of an external electric field and / or external mechanical stress. The transition energy has a critical point. A bias electric field and / or a bias mechanical stress is determined for bringing the transition energy of the at least one defect, defect complex or impurity to or close to the critical point. The external electric field comprises the bias electric field and an environmental noise electric field. The external mechanical stress comprises the bias mechanical stress and an environmental noise mechanical stress. The determined bias electric field and / or mechanical stress is applied to the quantum system.

Methods, systems, and apparatus for approximating a target quantum state. In one aspect, a method for determining a target quantum state includes the following acts: receiving data representing a target quantum state of a quantum system as a result of applying a quantum circuit to an initial quantum state of the quantum system; determining an approximate quantum circuit that approximates the specific quantum circuit by adaptively adjusting the number of T-gates available for the specific quantum circuit; and applying the determined approximate quantum circuit to the initial quantum state to obtain an approximation of the target quantum state.

Provided are quantum control methods and systems. The method includes generating a control pulse in a quantum system, determining a measurement of a state of the quantum system in response to the control pulse, determining a control pulse correction based on the control pulse, the measurement of the state of the quantum system, and a model reference state, modifying the control pulse based on the control pulse correction, resulting in a modified control pulse, and generating the modified control pulse in the quantum system.

The present invention provides a quantum system error detection device, the device comprising: a control register for receiving information representing a quantum state of a control qubit and outputting an operation result; an auxiliary register for receiving, on a one-to-one basis, information representing a quantum state of a target qubit; a CNOT gate connected to the control register and the auxiliary register; a first detector connected to the control register and configured to measure a quantum state of the control qubit to which the CNOT gate is applied; a second detector connected to the auxiliary register and configured to measure a quantum state of the auxiliary qubit to which the CNOT gate is applied; a probability calculation unit for calculating probabilities of quantum states of the control qubit and the target qubit from measurement results of the first detector and the second detector; and an error rate calculation unit for calculating error rates of quantum state initialization, the CNOT gate, and quantum measurement from the probabilities calculated by the probability calculation unit.

The invention relates to a method for generating a useful signal (11) from a signal (5') emitted from a spin-based quantum system (4), said method including exciting the spin-based quantum system (4) by means of an excitation light (13), exciting the spin-based quantum system (4) by means of an electromagnetic field (3) which jumps back and forth between two measurement frequencies at a modulation frequency, the two measurement frequencies having a first measurement frequency distance from an expected resonant frequency, detecting the signal (5') emitted from the spin-based quantum system (4) in order to obtain a measurement signal (7), multiplying the measurement signal (7) by a modulation signal (9) which jumps back and forth between two modulation signal states at the modulation frequency in order to generate a modulated measurement signal (7'), demodulating the modulated measurement signal (7') in order to generate the useful signal (11), determining a comparison signal, and determining whether the expected resonant frequency value is correct based on the comparison signal.

Methods, systems, and apparatus for simulating a quantum system. In one aspect, a method includes performing a first quantized quantum algorithm on an initial quantum state to simulate time evolution of a fermionic system and generate a time evolved quantum state; and measuring, by the quantum computer, the time evolved quantum state to obtain one or more reduced density matrices in first quantization, the measuring including performing a classical shadows method that applies separate random Clifford channels to each qubit register of multiple qubit registers that represent respective occupied orbitals in the fermionic system.

A quantum error correction system that can realize a scheme which, when the quantum system suffers some noise, the quantum system itself can act on itself to correct itself against this noise is provided. The quantum error correction system includes a quantum material and a bi-chromatic recovery drive generator in communication with the quantum material. The bi-chromatic recovery drive generator sends a waveform to the quantum material.