134 results about "Quantum system" patented technology

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 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.

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|.

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.

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.

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.

The invention belongs to the field of quantum precision measurement, and discloses a quantum system low-intensity magnetic field measurement method based on a CTK-Net hybrid architecture, and the method comprises the steps: building a low-intensity magnetic field ODMR data collection device, collecting an ODMR spectral line sequence, constructing a deep learning database, adding noise to the collected sequence data, and comparing the network performance. Finally, the model with the most stable performance and parameters thereof are stored; and finally, acquiring an ODMR spectral line sequence on an unknown soft magnetic material by using a diamond NV color center sensor after crystal axis orientation, and monitoring the size of a magnetic field in real time through a deep learning server. According to the method, global and local features can be captured at the same time, limitation of other models is overcome, excellent application potential is shown in the aspect of magnetic field prediction imaging, a brand new technical path is provided for the field of weak magnetic detection and imaging, and the method is worthy of popularization and application. The method has wide application prospects in multiple fields of chip flaw detection, magnetic flux leakage detection, geomagnetic measurement, brain magnetic detection and the like.

The invention discloses a quantum fidelity estimation method based on a resonance algorithm, and relates to the technical field of quantum computing, and the method comprises the steps: providing a target quantum system with the fidelity to be estimated and a detection quantum bit, initializing the detection quantum bit into a preset energy eigenstate, and enabling the target quantum system to be a quantum state prepared by an experiment; coupling the two to form a coupling system; controlling the coupling system to evolve for a preset time under a preset resonance Hamiltonian; measuring the probability that the detection quantum bit is in a preset excited state; frequency sweeping parameters in the resonance Hamiltonian are adjusted, evolution and measurement are repeated, when the frequency sweeping parameters are matched with the target energy level corresponding to the target quantum system, a peak value appears in the excited state probability, and the peak value is the fidelity of the target quantum system and the quantum state corresponding to the target energy level. According to the method, a large amount of multi-bit measurement is not needed, quantum fidelity estimation can be realized only through single-bit measurement, the measurement times are reduced, and the measurement realization difficulty is reduced.

A method (100) for determining a ground state (1000) of a quantum system is disclosed, comprising the following steps: 6) determining (102) the thermal state (1020) of the quantum system at a temperature value (1001', 1001) by optimizing the free energy (3020) of the thermal state (1020) at the temperature value (1001', 1001) by iteratively adjusting gate parameters (1022', 1022) by means of a variational quantum thermalizer (1010) until a first termination criterion is met; 7) checking (1025) whether the previously found thermal state meets a second termination criterion; 8) if the second termination criterion is not met (10250): decreasing (1026) the temperature value (1001', 1001); initializing (301) the quantum circuit (1011) of the variational quantum thermalizer using the gate parameters (1022', 1022) from the last iteration of step 2); repeating steps 2) and 3); 9) if the second termination criterion is met (10251): providing (103) an energy spectrum (1030) of the quantum system using the gate parameters (1022) of the last iteration of step 2) before the second termination criterion (10251) is met; determining (104) the ground state (1000) of the quantum system by selecting the state of the energy spectrum that is assigned the lowest energy.

The various embodiments pertain to extracting one or more noiseless configurations from a collection of noisy configurations generated by a quantum processor. A configuration can be represented as a series of bits, 1's and 0's, whereby 1 indicates a spin orbital is occupied and 0 indicates spin orbital is empty. Noise in the quantum system can cause a respective bit to be flipped from a 0 to a 1, and vice-versa. During removal of the noise effect(s), bits can be flipped from their current value to an alternate value (e.g., 0 → 1, 1 → 0). After bit flipping, a Hamiltonian diagonalization process can be applied to the noiseless configuration to generate an eigenstate from which a ground state of the system represented by the noisy configuration can be determined. The system can be an atom or molecule, with the bits relating to a spin orbital of an electron.

The invention relates to a method for calibrating a two-level spin quantum system in the form of a double quantum dot comprising a left dot and a right dot, coupled to a microwave cavity by symmetric and antisymmetric magnetic fields, the system being subjected to a bias voltage, the method being characterized by the steps of: - setting the bias voltage (ε) to zero volts, - determining the wave function φp of each of the quantum dots, - calculating and / or setting the antisymmetric magnetic coupling constant αas and the symmetric magnetic coupling constant αs, calculating and / or setting the tunnel coupling constant and / or the symmetric magnetic coupling constant αs and / or the antisymmetric magnetic coupling constant αas.

The invention relates to a method (100) for determining a ground state (1001) of a quantum system, comprising the steps of: providing (101) a hybrid variable component sub-algorithm and implementing (102) the hybrid variable component sub-algorithm (1010) on a hybrid computer platform comprising a classic computer and a quantum computer for implementing a quantum circuit (1011), in which the hybrid variable component sub-algorithm (1010) is implemented, wherein a gate parameter (1020) is determined (1025) on a classical computer by solving a differential equation comprising an equation matrix and an equation vector, and wherein a virtual time evolution of the gate parameter (1020) determined by solving the differential equation for a time step is determined (1026) by applying a Runge-Kutta method. The invention further relates to a hybrid computer platform, to a hybrid variable component sub-algorithm and to a use of the method for material simulation.

Systems and methods for performing fault-tolerant quantum operations for a four-legged cat code are provided. A quantum system includes an auxiliary qubit dispersively coupled to a first logical qubit, and the quantum system can be operated at least in part by generating and applying a first drive waveform to the auxiliary qubit, the first drive waveform including a first comb of pi pulses having selective frequencies corresponding to a first selection of even and odd cavity resonance frequencies of the first logical qubit; and reading out a state of the auxiliary qubit.

A frequency-tunable coupler (130) couples first and second quantum systems (110, 120), the coupler (130) and the second quantum system (120) being arranged so that tuning the coupler (130) to the second quantum system (120) forms a hybridized mode with a symmetric state and an asymmetric state, coupled to a waveguide (140) The coupler (130) is driven with an excitation-preserving transition signal to transfer a first excited state of the first quantum system (110) to the asymmetric state of the hybridized mode, thereby emitting a photon encoded with a first part of a quantum state into the waveguide at a first frequency. The first quantum system (110) is simultaneously driven with a non-excitation-preserving transition signal to transfer a second excited state of the first quantum system (110) to the symmetric state of the hybridized mode, thereby emitting a second photon encoded with a second part of the quantum state, at a second frequency.

The invention relates to a method for evaluating a measurement signal (5') emitted by an NV quantum system (4). The NV quantum system (4) is initialised using pulsed excitation light (13, 320) and is subjected to an alternating magnetic field (3; 310) which alternately assumes two different field states. The measurement signal (5') emitted by the NV quantum system (4) is detected and integrated over an integration window (331) that includes a signal time of a first light pulse (322) in order to obtain a signal value, and over an integration window (332) that includes a signal time of a second light pulse (322) in order to obtain a reference value, wherein the first and the second light pulses are two temporally offset light pulses of the excitation light (13; 320), wherein the first light pulse (322) is generated after the alternating magnetic field (3; 310) has assumed a first of the two field states, and wherein the second light pulse (322) is generated after the alternating magnetic field (3; 310) has assumed a second of the two field states. A measurement value is determined from the signal value and the reference value.

A system comprises a memory that stores computer executable components, and a processor that executes the computer executable components stored in the memory, wherein the computer executable components comprise: an execution component that directs execution of a time dependent quantum algorithm at a quantum processor of a quantum system, wherein the quantum algorithm comprises propagating a wave packet in time under a determined Hamiltonian, resulting in a measurable output at the quantum system, and an evaluation component that determines an expectation value based on the output and corresponding to a vibrationally resolved electronic spectrum of a molecule.

A quantum computing method includes determining an initial quantum state of a quantum system, and inputting the initial quantum state to a quantum circuit corresponding to the quantum system and obtaining a quantum state outputted by the quantum circuit, wherein the outputted quantum state is a quantum circuit generation state corresponding to the quantum system. The method further includes updating a quantum system parameter based on the outputted quantum circuit generation state. The quantum system parameter includes a quantum imaginary-time parameter. The method further includes updating a quantum circuit parameter of the quantum circuit according to the updated quantum system parameter to obtain an updated quantum system, and determining a final quantum state of the quantum system as a minimum eigenstate of the quantum system.

The embodiment of the invention provides a method for determining a ground state energy value of a target quantum system and a related device. The method comprises the following steps: acquiring a plurality of parameter value sets corresponding to a specified parameter set; taking minimization of the energy value of the quantum state as a target, adjusting at least part of parameter values in the parameter value set until a specified convergence condition is achieved, and obtaining a ground state energy value of the target quantum system; adjusting at least a part of parameter values in the parameter value set: when the gradient information is used for updating the parameter value set until the energy value corresponding to the quantum state meets a preset local convergence condition, using the global optimal position information of the plurality of parameter value sets for updating; or, when global optimal position information of the multiple parameter value sets is used for updating the parameter value sets until the distance between the position of the parameter value sets in the search space and the global optimal position is smaller than a preset distance threshold value, gradient information is used for updating. The accuracy of the determined ground state energy value can be improved to a certain extent.

The invention discloses a quantum information feature extraction method, computer equipment and a computer readable storage medium. The method comprises the steps of obtaining quantum observation data of a quantum system; performing frequency domain conversion processing on the quantum observation data, and determining frequency domain characteristic data corresponding to the quantum observation data; according to the frequency domain feature data, target feature parameters are determined, and the target feature parameters are used for regulating and controlling the quantum system. Therefore, the frequency domain feature data can be obtained by performing frequency domain conversion processing on the quantum observation data, so that the target feature parameters are accurately obtained according to the frequency domain feature data, high-precision extraction of the target feature parameters is ensured, support is provided for accurate calibration of a quantum system, and automatic extraction of the quantum information feature data is realized. In addition, compared with a mode of judging the regulation and control parameter value of the quantum system only depending on experience, the implementation mode of the invention can eliminate subjective errors and improve the calibration precision of the quantum system.