56 results about "Quantum register" patented technology

A quantum computing device initiates a first quantum algorithm comprising a test method implemented as a quantum oracle, the first quantum algorithm receiving an input of a first quantum register comprising one or more qubits and a second quantum register comprising one qubit, each qubit in the first quantum register corresponding to a test case for the test method. The quantum computing device receives an output of the first quantum algorithm. The quantum computing device initiates a second quantum algorithm, the second quantum algorithm receiving an input of a third quantum register and the output of the first quantum algorithm. The quantum computing device performs a measurement on the first quantum register and a measurement on the third quantum register. The quantum computing device determines, based on the measurement on the first quantum register and the measurement on the third quantum register, that the test method passed or failed.

Disclosed is an approach for learning probability distributions as differentiable quantum circuits (DQC) that enable efficient quantum generative modelling (QGM) and synthetic data generation. A method includes training of a differentiable quantum circuits (DCQ) based model, where data is encoded in a latent space with a phase feature map, followed by a variational quantum circuit. The trained model is then mapped to the bit basis using a fixed unitary transformation, coinciding with a quantum Fourier transform circuit in the simplest case. This allows fast sampling from parametrized distributions using a single-shot readout. Simplified latent space training provides models that are automatically differentiable. Samples from propagated stochastic differential equations (SDEs) can be accessed by solving a stationary Fokker-Planck equation and time-dependent Kolmogorov backward equation on a quantum computer. A route to multidimensional generative modelling is opened with qubit registers explicitly correlated via a (fixed) entangling layer.

The invention relates to the technical field of quantum cryptographic analysis, in particular to a parallelization solution optimization method and system for a quantum cryptographic analysis Grover-mets-Simon problem, and aims at solving the Grover-mets-Simon problem by verifying whether an object function in a quantum cryptographic algorithm meets a solution condition or not and constructing a truncated periodic function for the met object function. The solution search space is divided into a parallel solution high bit string period solution space and a general solution low bit string period solution space; solving the truncated periodic function in a parallel high-bit string periodic solving space by using a quantum register according to a parallel Grover-mets-Simon algorithm, so as to obtain quantum key algorithm periodic data through a plurality of parallel Simon threads; and a Grover-mets-Simon algorithm is utilized to carry out supplementary solution on the periodic function in a general low-bit string periodic solution space so as to obtain a quantum key algorithm key and periodic residual bits. According to the method, the depth, width and gate circuit expenditure of the quantum circuit required by quantum cryptographic analysis solution can be flexibly adjusted by adjusting truncation parameters.

A method for operating a quantum register. The method includes: carrying out of a first read-out process, so that first data representing a first state of the quantum register are ascertained; first control of the quantum register, which is in the first state, in accordance with a quantum gate; carrying out of a second read-out process, so that second data representing a second state of the quantum register which results from the first control are ascertained; adjustment of at least one parameter of the quantum gate using the first data and the second data in order to optimize a target function which is dependent on the first data and on the second data; second control of the quantum register in accordance with the quantum gate which results from the adjustment.

The invention relates to the technical field of short-term electric quantity regulation and control, in particular to an electric quantity regulation and control method and system based on a quantum algorithm and a neural network in an electric power market environment. According to the method, a plurality of quantum registers are constructed to form a population and are initialized, the quantum registers are individuals representing market decisions, and the market decisions are sets of declared quantity-price curves of all participants in the electricity market; the quantum code of one participant is selected from each quantum register to serve as a candidate solution, the fitness of the candidate solution is evaluated, and updating variation is conducted on half of the quantum registers with the smaller fitness of the candidate solution so as to iterate the population; when the number of population iterations reaches a set threshold value, selecting an individual which meets the constraint conditions of each participant and has the maximum optimization target as an optimal declaration strategy; obtaining a declaration quantity price decision of each participant through optimal declaration strategy inverse quantum coding; the optimization objective as the individual's market decision is to maximize the sum of producer and consumer residuals. According to the method, the defect of poor power resource configuration efficiency in the prior art is overcome, market decision optimization is performed in combination with the quantum genetic algorithm, declaration reference is provided for each participant, so that clearing power is improved, power configuration is optimized, and configuration efficiency is improved.

A method for suppressing dephasing of a resting qubit (qb1) in a quantum register comprising a plurality of qubits (qb1, qb2, qb3, qb4) is specified, comprising the step of applying an identity pulse (1) to the resting qubit (qb1), wherein the identity pulse (1) implements an identity operation on the resting qubit (qb1). Furthermore, a quantum computer is specified.

Provided in the present application are a quantum circuit construction method and apparatus, and a device, a storage medium and a product. The method comprises: preparing, on the basis of a modulus N, a first quantum register that comprises 2n first quantum bits and a second quantum register that comprises n first quantum bits, n being the binary expansion length of the modulus N; obtaining an equal-probability quantum superposition state of the first quantum register by constructing a Hadamard gate; constructing a first modular multiplication module and 2n-1 second modular multiplication modules on the second quantum register; sequentially using a plurality of first quantum bits as control bits, sequentially using the first modular multiplication module and the 2n-1 second modular multiplication modules as controlled parties, and constructing 2n controlled unitary gates; and performing inverse Fourier transformation and measurement on the first quantum register to obtain a phase estimation result corresponding to a modular function period r. The solution of the present application provides support for solving the problem of larger-scale computation.

According to one aspect, the subject matter of the present description is a method for allocating logical qubits of a quantum algorithm to physical qubits of a quantum processor arranged according to a given architecture, the method including: establishing, from the architecture, a connectivity graph; the establishing, from the quantum algorithm, a graph of the logical operations; assigning a weight to each logical qubit; ranking the logical qubits according to the weight; allocating a first logical qubit chosen according to the weight, to a first physical qubit of the quantum register; iteratively allocating the logical qubits remaining to be allocated, including calculating a score; and reproducing the iterative allocation procedure until allocating the last logical qubit remaining to be allocated, thus resulting in obtaining a configuration for allocating logical qubits of the quantum algorithm to physical qubits of the quantum processor.

Systems, methods, computer-readable media, and techniques disclosed herein provide for preparing a solution to a problem comprising a constraint on a non-classical computer, comprising: (a) providing a state preparation operation, wherein the state preparation operation comprises at least a portion of an implementation of the problem comprising the constraint on the non-classical computer, wherein the state preparation operation is configured to evolve a quantum register to a solution state; (b) applying a constraint detection operation, the constraint detection operation comprising entangling an ancilla qubit with a set of data qubits; and (c) measuring the ancilla qubit to determine whether a constraint of the problem is satisfied.

Quantum computing devices, circuits, and methods for performing a quantum multiplication of two numbers. A first quantum register is prepared in a first state indicative of a first number, and a second quantum register is prepared in a second state indicative of a second number. A third quantum register is prepared in an initial state. Each of a plurality of controlled bidirectional addition circuits performs controlled bidirectional addition of the second number into the third quantum register, controlled on a respective qubit of the first plurality of qubits. A plurality of correction operator circuits operates on the first, second and third quantum registers to remove discrepancies between performing controlled bidirectional addition and performing controlled addition. Qubits in the third quantum register are output in a prepared state indicative of a product of the first and second numbers.

The application belongs to the technical field of secret communication, and discloses a mixed quantum and classical symmetric encryption key security analysis method, receives a plurality of pairs of known plaintext and ciphertext data, constructs a Hamiltonian operator for each pair, makes a quantum state corresponding to correct ciphertext a ground state, divides a key into two segments, and circularly traverses all values of the first segment; in each cycle, a parameterized superposition state composed of all values of the second segment is constructed on a quantum register, and is input into a quantum encryption circuit together with a plaintext quantum state to generate a ciphertext superposition state, a cost function is obtained by measuring a weighted average of Hamiltonian expectation value, and a parameter is optimized by using a quantum variation algorithm until the ciphertext superposition state converges to a state corresponding to a correct key, and the second segment key can be determined by measuring the optimized quantum state, and the complete key is analyzed in combination with the value of the first segment. The method has the advantages of classical enumeration and quantum optimization, reduces the number of quantum bits while maintaining high analysis efficiency.

Systems and methods involving quantum machines, hybrid quantum machines, aspects of quantum information technology and / or other features are disclosed. In one exemplary implementation, a system is provided comprising a quantum register that stores quantum information using qubits, wherein the qubits are configured to store the quantum information using particles or objects arranged in a lattice of quantum gates, a clock that provides a clock cycle to the quantum register, and a qubit-tie computing component coupled to the quantum register, wherein the qubit-tie computing component is configured to shift the quantum information between the qubits, wherein the system stores the qubits in different states using physical qualities, which may define qubits that are configured to be entangled and superposed at a same time. Further, the quantum register may comprise an entanglement component, and / or the qubit-tie computing component may comprise a superposition component.

A quantum computer architecture and a method for solving quantum chemical problems are provided, comprising: determining and storing (135) an approximate ground state for the Hamiltonian H using a classical computer (130); modeling the approximate ground state on a first quantum register (210) of a quantum computing unit QPU (240); modeling the time evolution operator (230) as a gate sequence of the QPU (240) and executing (145) the same; modeling a measurement operator x on one of the QPU (240); reading and storing (155) the measurement operator according to time evolution to obtain an approximation for the ground state value E0 (260) of H, wherein the determination of the approximate ground state is carried out using a Density Matrix Renormalization Group DMRG.

A quantum source coding method includes: initializing a quantum register having a plurality of nodes: loading a unary-coded message into the quantum register; loading an address state into an address register of each message node of the quantum register; sorting the message nodes based on a data register such that the message nodes form a message-sorted sequence; and applying, for each message node at an end of the message-sorted sequence, a CNOT gate to the address state of each of the register's message nodes and output nodes. The method also includes: unsorting the message nodes; sorting the nodes based on the address register such that the nodes form a fully-sorted sequence; applying, for each pair of adjacent nodes in the fully-sorted sequence having the same address state, a CNOT gate to the data registers of each pair; and unsorting the nodes to return the fully-sorted sequence to the initial sequence.

Methods and systems for processing quantum jobs by a hybrid computing system comprising a classical computer system and one or more atomic qubit-based quantum processing units (QPUs), wherein the method may comprise receiving or determining one or more batches of quantum jobs by the classical computer system, each quantum job being associated with register layout information defining a layout of a quantum register for execution of the quantum job, each batch being associated with trap layout information defining a layout of an electromagnetic trap for trapping atomic qubits, the trap layout of a batch being defined such that register layouts associated with jobs of the batch can be mapped onto the trap layout; selecting a batch of quantum jobs from the one or more batches of quantum jobs and configuring a first trap for a first QPU of the one or more QPUs based on trap layout information associated with the selected batch; and, executing the selected batch of quantum jobs using the first QPU.

Methods and systems for processing quantum jobs by a hybrid computing system comprising a classical computer system and one or more atomic qubit-based quantum processing units (QPUs), wherein the method may comprise receiving or determining one or more batches of quantum jobs by the classical computer system, each quantum job being associated with register layout information defining a layout of a quantum register for execution of the quantum job, each batch being associated with trap layout information defining a layout of an electromagnetic trap for trapping atomic qubits, the trap layout of a batch being defined such that register layouts associated with jobs of the batch can be mapped onto the trap layout; selecting a batch of quantum jobs from the one or more batches of quantum jobs and configuring a first trap for a first QPU of the one or more QPUs based on trap layout information associated with the selected batch; and, executing the selected batch of quantum jobs using the first QPU.

A method of implanting atoms into a substrate is disclosed where the atoms are at least some of the constituent atoms of a molecule that has one or more color center atom(s) and one or more satellite atom(s). The molecule may comprise not more than three color center atoms of the same element of the group. The molecule may comprise one or more color center atom(s) other than N, at least six satellite atoms of N, and / or one or more satellite atoms other than 13C. A quantum register comprising a color center and at least one nuclear spin isotope atom in a substrate is manufactured using the color center of the quantum register formed by a color center atom implanted into the substrate. A quantum register with such color center and at least one nuclear spin isotope atom in a substrate is disclosed.

The present invention relates to a tunable nanobeam cavity resonator (100), the tunable nanobeam cavity resonator comprising: a first optical cavity (102); a second optical cavity (104), the second optical cavity being optically coupled to the first optical cavity (102); a conductive portion (106); and an electrode (108), wherein the first optical cavity (102) and / or the second optical cavity (104) comprises a quantum emitter configured to carry quantum bits. The first optical cavity (102) and the second optical cavity (104) are disposed in the tunable nanobeam cavity resonator (100) such that there is a gap (110) between the first optical cavity (102) and the second optical cavity (104). The conductive portion (106) is configured to move relative to the electrode (108) and the first optical cavity (102) when a voltage is applied between the conductive portion (106) and the electrode (108); the conductive portion (106) is mechanically connected to the first optical cavity (102) and the conductive portion (106) is mechanically connected to the second optical cavity (104) such that movement of the conductive portion (106) causes movement of the second optical cavity (104) relative to the first optical cavity (102) to adjust the gap (110) between the first optical cavity (102) and the second optical cavity (104).

A quantum computing device includes: at least one quantum register including a plurality of qubits; and a hardware decoder. The hardware decoder is configured to: receive syndrome data from one or more of the plurality of qubits; and decode the received syndrome data by implementing a union-find decoding algorithm via a hardware microarchitecture including two or more pipeline stages.

The present disclosure relates to an apparatus for performing a quantum gate on a pair of atomic particles in a quantum register, comprising: a laser source, a microwave source, a set of optical elements configured to direct laser radiation generated by the laser source onto the pair of atomic particles, a microwave antenna, coupled to the microwave source, and configured to illuminate the pair of atomic particles with microwave radiation generated by the microwave source, wherein the microwave source is configured to control a duration, an intensity, a detuning and / or a phase of the microwave radiation, a laser modulator configured to control a duration, an intensity, a detuning and / or a phase of the laser radiation directed to the pair of atomic particles, and a control unit configured to control the laser modulator and the microwave source to illuminate the pair of atomic particles with modulated laser radiation and modulated microwave radiation to perform the quantum gate on the pair of atomic particles.

A method for performing parallel quantum computations in a quantum register comprising qubits (qb1, qb2, qb3, qb4) with an each-to-each interaction is provided, comprising the steps: - applying a first periodic pulse sequence (1) to qubits (qb1, qb3) in a first sub-register (31), - applying a second periodic pulse sequence (2) to qubits (qb2, qb4) in a second sub-register (32), wherein - the first periodic pulse sequence (1) and the second periodic pulse sequence (2) are adjusted such that a time-averaged pairwise interaction between any qubit (qb1, qb3) in the first sub-register (31) and any qubit (qb2, qb4) in the second sub-register (32) disappears. Furthermore, a quantum computer (10) is specified.

Methods, systems, and apparatus for quantum phase estimation. In one aspect, an apparatus includes a quantum circuit comprising a first quantum register comprising at least one ancilla qubit, quantum gates, comprising at least (i) two Hadamard gates, (ii) a phase gate, (iii) a unitary operator, and (iv) a measurement operator, a second quantum register comprising one or more qubits, wherein the second quantum register is prepared in an arbitrary quantum state that is not an eigenstate of the unitary operator; and a phase learning system, configured to perform phase estimation experiments on the quantum circuit, comprising repeatedly measuring the state of an ancilla qubit for each phase estimation experiment to determine an expectation value of the state of the ancilla qubit and learn phases of the eigenvalues of the unitary operator.

Methods, systems and apparatus for preparing arbitrary superposition quantum states of a quantum register on a quantum computer, the quantum state comprising a superposition of L computational basis states. In one aspect, a register of log L qubits is prepared in a weighted sum of register basis states, where each register basis state indexes a corresponding quantum state computational basis state, and the amplitude of each register basis state in the weighted sum of register basis states is equal to the amplitude of the corresponding computational basis state in the superposition of L computational basis states. A unitary transformation that maps the register basis states to the corresponding L computational basis states is then implemented, including, for each index 1 to L, controlling, by the register of log L qubits, transformation of the quantum system register state for the index to the corresponding computational basis state for the index.

According to various embodiments, a method for operating a quantum register (102) may comprise: adapting (300) a first parameter of a first quantum circuit (VQCp) a first time to optimize an objective function by driving (103) the quantum register (102) according to the first quantum circuit (VQCp); first determination of a second quantum circuit (VQCp + 1) comprising a quantum gate and a first quantum circuit (VQCp) having an adapted first parameter derived from the first adaptation (300); adapting (300) a second parameter of the quantum gate for a second time to optimize the objective function by driving (103) the quantum register (102) according to a second quantum circuit (VQCp + 1); a second determination is made as to whether a second quantum circuit (VQCp + 1) having an adapted second parameter derived from the adaptation (300) meets the stored convergence criteria.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for quantum phase estimation. In one aspect, a method includes: performing a plurality of phase estimation experiments on an ancilla qubit, wherein each experiment includes: preparing the ancilla qubit in an initial quantum state; applying a unitary operator to the ancilla qubit prepared in the initial quantum state and a quantum register prepared in an arbitrary quantum state one or more times; and measuring the state of the ancilla qubit; determining an expectation value of the state of the ancilla qubit based on results of the plurality of phase estimation experiments; and inferring a phase of an eigenvalue of the unitary operator by optimizing a mixture model representing probabilities of the state of the ancilla qubit based on the determined expectation value of the state of the ancilla qubit and the measured state of the ancilla qubit.

A method for training and sampling a quantum model comprises: training a quantum model as a quantum sampler configured to produce samples which are associated with a predetermined target probability distribution and which are exponentially hard to compute classically, the training including classically computing probability amplitudes associated with an execution of a first parameterized quantum circuit that defines a sequence of gate operations for a quantum register and optimizing parameter(s) of the first parameterized quantum circuit based on the classically computed probability amplitudes; and, executing a sampling process using the hardware quantum register including determining an optimized quantum circuit based on the optimized parameter(s) and the first parameterized quantum circuit or a second parameterized quantum circuit, which is related to the first parameterized quantum circuit, and executing the optimized quantum circuit on the hardware quantum register and generating a sample by measuring the output of the hardware quantum register.

A method is presented for use with a quantum circuit and a quantum register having a plurality of qubits. The method includes: sequentially calling, via a plurality of oracle gates of the quantum circuit, a quantum oracle operator on a plurality of qubit states to produce a sequence of quantum oracle calls; applying, via a plurality of diffusion gates of the quantum circuit, a plurality of diffusion operators, wherein a selected one or more of a plurality of diffusion operators is applied after each of the quantum oracle calls in the sequence of oracle calls; and generating a quantum computing result based on a measurement from the plurality of qubits, after having applied the sequence of oracle calls and the plurality of diffusion operators.

The invention discloses a quantum circuit determination method and a method for observing a multivariate high-order function. The method comprises the following steps: acquiring an auxiliary quantum register, a first target quantum register and a second target quantum register; sequentially acting a Hadamard gate on an auxiliary quantum register, acting a first quantum logic gate virtually controlled by the auxiliary quantum register on the first target quantum register, and acting a second quantum logic gate actually controlled by the auxiliary quantum register on the first target quantum register, a third quantum logic gate actually controlled by the auxiliary quantum register acts on a second target quantum register, a NOT gate actually controlled by the auxiliary quantum register and the first target quantum register acts on the second target quantum register, a Hadamard gate acts on the auxiliary quantum register, and a target quantum circuit is obtained. The target quantum circuit can determine the observation value of the multivariate high-order function according to the observation probability of the quantum state of the auxiliary quantum register, and observation of the multivariate high-order function is achieved.

Proposed is a r-Turing complete, universal quantum computing system and corresponding method for programmable, universal quantum computing. A quantum computing circuit is composed of a plurality of auto-parallelized quantum network devices, wherein each quantum network device comprises one or more quantum logic gates whose computational steps are synchronized in time, wherein a quantum logic gate is a device performing a fixed unitary operation on selected qubits in a fixed period of time, wherein for each quantum logic gate one or more qubits form an input quantum register to the respective quantum logic gate and one or more qubits form an output quantum register to the respective quantum logic gate, the outputs of the quantum logic gates being at least partially connected by wires to the inputs of other quantum logic gates, and quantum network devices performing the computational steps by its quantum logic gates within one clock cycle.

A quantum oracle, configured to implement a discrete-variable representation (DVR) matrix, operates by: loading a first column of the DVR matrix via a quantum random access memory oracle; recursively loading an additional N−1 columns of the DVR matrix via an alternating sequence of unitary circuits operating on a first set of qubits and a second set of qubits controlled via a column index; and transferring states of the first set of qubits and the second set of qubits to a quantum register controlled by a parity of the column index.