8447 results about "Quantum electrodynamics" patented technology

The present disclosure relates to atomic quantum and photonic apparatuses and methods, for example, atomic radio apparatuses and methods. The disclosure describes various aspects of atomic radio. More specifically, the disclosure describes an atomic radio apparatus and associated hardware. Methods for performing radio communications, sensing, and imaging, are described. The disclosure further describes laser, optical, photonics, atom-photonics, and hybrid micro-integrated subsystems for Rydberg excitation, spectroscopy, and quantum technology.

Systems, apparatuses, methods, and computer program products are disclosed for authentication of devices. An example method includes an authentication technique utilizing multiple authentication factors. The first authentication factor includes obtaining identical quantum entangled particles by a first device and a second device. The first and second device may read the quantum entangled particles to obtain identical bit sequences associated with the quantum entangled particles. The first and second device may utilize the bit sequences, along with a second factor, to authenticate a connection between the devices. The second factor may be, for example, a user password. The first device may send a request for authentication including one of the bit sequences and an encrypted version of the user's password. The second device may authenticate the first device using an identical copy of the bit sequence and previously obtained knowledge of the user's password.

The present disclosure discloses a circularly polarized satellite antenna based on a magnetoelectric dipole. A floor is slotted, and an equivalent magnetoelectric dipole is excited using a grounded right-angle folded dipole, while two square parasitic patches are loaded to enhance a radiation performance, thus exciting a broadband high-gain circularly polarized radiation beam. The present disclosure utilizes the L-shaped right-angle folded dipole to simultaneously realize an ingenious combination of an electric dipole and a magnetic dipole, realizing a good circularly polarized radiation performance. At the same time, the present disclosure realizes circularly polarized radiation using a form of the magnetic dipole, which results in a stable pattern and a high gain.

Methods and systems are disclosed for solving a differential problem using a hybrid computer system. The differential problem defines a differential equation, and a target function defines an approximate solution to the differential equation. The target function is defined as a sum of basis functions with parameterized coefficients. The method comprises receiving or determining a quantum circuit defining operations of a parameterized quantum model of the differential equation, and determining the solution to the differential problem based on the parameterized quantum model and, optionally, a loss function associated with the differential problem. The quantum circuit defines operations for encoding primitive elements (e.g., terms such as f(x), f(x) / dx, g(x), etc.) of the differential equation in a plurality of quantum states of quantum elements of the quantum processor. Each quantum state of the plurality of quantum states corresponds to a set of (parametrized or unparametrized) coefficients associated with the basis functions, of which at least one quantum state of the plurality of quantum states corresponds to a set of parametrized coefficients associated with the basis functions. The determination of the solution includes varying the variational parameters to determine a set of optimal parameters. The varying of the variational parameters includes: translating the operations of the quantum circuit into control signals for control and readout of the quantum elements of the quantum register; applying the operations of the quantum circuit to the quantum elements based on the control signals; determining classical measurement data by measuring one or more comparisons, e.g. overlaps, between pairs of quantum states from the plurality of quantum states; computing a loss value based on the loss function and the classical measurement data; and adjusting the variational parameters based on the loss value.

Systems and methods relate to selectively arranging a plurality of qubits into a spatial structure to encode a quantum computing problem. Exemplary arrangement techniques can be applied to encode various quantum computing problems. The plurality of qubits can be driven according to various driving techniques into a final state. The final state can be measured to identify an exact or approximate solution to the quantum computing problem.

A system and method for providing metered quantum entanglement-as-a-service are described. Entangled pair source nodes apply a unitary transformation to generated entangled quantum particles, such that the entangled quantum particles are transformed into a given one of a plurality of transformed states that are selected randomly or in a manner that is not readily apparent to customers. The transformed entangled quantum particles are distributed to recipients, such as customers. However, in order for the recipients to be able to use the received entangled particles to communicate shared information, such as a shared secret, the recipients require knowledge of the respective states of the entangled quantum particles resulting from the randomly selected transformations. The state information is metered out in response to receiving payment or other authorization indicating a recipient / customer has complied with terms of use of the quantum entanglement distribution service.

The invention provides a molecular dynamics quantum variation simulation method and device.The molecular dynamics quantum variation simulation method comprises the steps that an initial quantum state of a target molecular system is measured to obtain a position basis vector set, then the position basis vector set and momentum basis vectors of the initial quantum state are used for constructing a parameterized quantum circuit, and the parameterized quantum circuit is obtained; and iteratively updating the parameters in the parameterized quantum circuit until the target evolution time is reached, thereby obtaining the final quantum state of the target molecular system. According to the method, a large-scale molecular simulation problem can be solved on a shallow quantum circuit, it is guaranteed that the circuit depth is only related to the Hamiltonian of a system and does not increase along with simulation time, and due to the fact that the depth of the quantum circuit is not related to evolution time, the quantum circuit depth can be improved. The method provided by the invention can be applied to simulating the processes of structural evolution, phase change and the like of the material under a long time scale.

A quantum computing service includes a quantum circuit compilation module that uses received information about quantum processing units (QPUs) along with information about a quantum circuit to be compiled in order to generate an optimized ordered list of compilation passes to be performed to compile the quantum circuit for execution on a given QPU.

The technology relates to enhancing performance of quantum sensor operation in a noisy environment. Quantum neural networks are used to pre- and post-process analog signals to which qubits of a quantum sensor are exposed. Intra-processing using additional quantum neural networks may also be employed. This approach filters out noise from both the input analog signal and the system itself to achieve a very high signal to noise ratio. This permits the system to detect induced dynamics associated during exposure of the qubits to the analog signals. This enables the quantum sensor to sense a change in a state of a system under test, which can be beneficial for areas such as imaging, magnetometry, sensing electric fields, optomechanical sensors, quantum radar and other areas where enhanced signal to noise ratios are desired.

The invention discloses a relativistic magnetron with angular slotting coupling output, the magnetron adopts a radial extraction rectangular output structure, the magnetron comprises an anode, a cathode and a magnet, the anode comprises a long anode block and a short anode block, the end part of the short anode block is provided with an angular coupling slot, the end part of the long anode block is provided with a reflection ring, and the end part of the short anode block is provided with an angular coupling slot. A high-frequency magnetic field is distributed in a fan-shaped cavity formed among the short anode block, the long anode block and the reflecting ring, and the high-frequency magnetic field is coupled into an external waveguide through the angular coupling slot to realize output; according to the relativistic magnetron disclosed by the invention, the adopted output structure is positioned at the end part of the anode block, and all the resonant cavities participate in microwave energy extraction, so that the angular periodic symmetry of the resonant cavities is hardly influenced by the output structure; and the coupling output structure and the output structure are axially separated from the resonant cavity area, the external space of the resonant cavity can be used for arranging magnets, the excitation space is small, and the realization of light and small size of the system is facilitated.

The invention relates to a method of measuring an observable of a cat qubit. A quantum system includes a command circuit and a non-linear superconducting quantum circuit including a non-linear element and a resonant portion. The non-linear superconducting quantum circuit has first and second modes with respective resonant frequencies fa and fb. The method comprises: a) delivering (900), by the command circuit, microwave radiation at a frequency fb to drive the second mode, thereby causing the non-linear element to engineer a jump operator L2α= κ2a2−α2 stabilizing a two-dimensional manifold hosting the cat qubit, b) mapping (910) the observable to be measured to the Pauli operator Z in a cat qubit manifold of a size value which square modulus is greater than or equal to 2, and c) measuring (920) the value of the Pauli operator Z.

In a general aspect, a quantum program can be automatically synthesized or compiled. In some implementations, a discretized state space is obtained. The discretized state space includes a plurality of states for one or more qubits of a quantum processor. A discrete action space is obtained. The discrete action space includes a plurality of unitary operations for the one or more qubits of the quantum processor. A policy that uses the discretized state space and the discrete action space to generate quantum programs for quantum state preparation is defined. A dynamic programming process is used to improve the policy. An initial state and a target state of the one or more qubits is identified. The policy is used to generate a quantum program to produce the target state from the initial state. The quantum program include a subset of the unitary operations in the discrete action space.

The invention pertains to quantum computing. Specifically, the invention refers to a computer-implemented method for finding the ground state of a molecule with a quantum processor by using a quantum-classical Variational Quantum Eigensolver (VQE) method with the ground state corresponding to a Hamiltonian of the molecule, the quantum processor comprising a predetermined quantum circuit for producing trial quantum states for the Hamiltonian operator, said predetermined quantum circuit comprising at least parametric quantum gates associated with one or more parameters to be optimized, the method comprising: - providing an initial and final Hamilton operator, building up a pool of generators to construct an Ansatz of parametrized entanglers for the quantum circuit, and - applying the quantum-classical VQE method to optimize the values of the parameters for finding the ground state of the Hamiltonian.

In various examples, systems and methods for decomposition of quantum oracles for simulating quantum circuits are provided. A simulation platform may receive as input a representation of a quantum circuit that comprises decomposable Boolean functions that define a quantum oracle and convert a Boolean representation of the quantum oracle to a set of Boolean functions. The Boolean functions may be used to create an oracle tensor network (e.g., a MPO sub-tensor network) comprising an exact representation of the Boolean representation of the quantum oracle. The oracle tensor network representation may be incorporated into a tensor network representation of the quantum circuit and passed to the simulation platform in order to simulate the quantum circuit.

Quantum computing systems require methods to control energies of qubits and couplers for quantum operations. Flux biasing of qubits and quantum couplers is provided for a superconducting quantum computer using single-flux-quantum (SFQ) technology. This method is applicable to a wide range of superconducting qubit structures and couplers, including transmons, fluxoniums, flux qubits, phase qubits and other superconducting qubits. This method enables arbitrary-amplitude time-varying flux biasing of qubits and couplers, due to a sequence of high-speed SFQ pulses. Several preferred embodiments are disclosed which provide high-fidelity control of fast single-qubit and multi-qubit operations.

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

The invention discloses a Rydberg atom microwave measurement sensitivity improving method based on atom velocity selection, and relates to the field of Rydberg atom microwave measurement, and the method comprises the steps: moving the frequency of probe light to an energy level resonance transition position of cesium atoms from a ground state to an excited state, scanning the frequency of the coupled light within a Rydberg state energy level preset range, and observing an EIT signal; the frequency of the detection light is changed, the detuning amount of the detection light is selected to enable the EIT signal to reach the maximum, and the frequency of the detection light is locked to the frequency corresponding to the maximum position of the EIT signal; meanwhile, a local oscillation field signal generator in the Rydberg atomic microwave sensitivity measurement device is turned on, and corresponding EIT-AT splitting is generated; the frequency of the coupling light is locked to the coupling light laser frequency corresponding to the lowest point of EIT-AT splitting, and the Rydberg atom microwave measurement sensitivity reaches the maximum. The cesium atom speed is screened and controlled, and the signal-to-noise ratio of the measurement signal is improved, so that the measurement sensitivity is improved.

Quantum Phased Array(s) of emitters and receivers that generate, modulate, emit, receive, and detect any quantum field. Quantum phased arrays include particle source(s) sourcing any quantum field, transmit modulator element(s) modulating any quantum observable and the associated quantum field, emitting elements radiating one or more quantum fields spatiotemporally, a propagation medium with one or more modulator elements for complete control of the quantum field, receiver(s) receiving one or more quantum fields, receive modulator element(s) modulating any quantum observable and the associated quantum field, detector(s) resolving one or more received quantum fields. Quantum metrology, communication and computing systems including quantum phased arrays are detailed for leveraging quantum field engineering functionality (complete control of one or more wavefunctions of one or more particles in any one or more orthonormal bases) of quantum phased arrays for quantum metrology, communication and computing applications.

Methods and systems are provided to generate and use pairs of highly nondegenerate frequency-entangled photons for Hong-Ou-Mandel interferometric measurement of local or remote samples. The use of highly nondegenerate frequency-entangled photon pairs enables ultra-high spatial resolutions even in the presence of background noise, dispersive intermediate media and / or dispersive or multi-interface targets, and high probe photon losses. The use of highly nondegenerate, narrow-band, frequency-entangled photon pairs for interferometric measurement of distance also allows the interferometer to be calibrated more easily for the two (or more) discrete narrow bands of wavelengths represented by the photon pairs. The use of narrow-band nondegenerate frequency-entangled photon pairs also permits improved noise rejection and increased fidelity in coincidence detection.

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.

The invention discloses a method, a system and a detection device for detecting a partial discharge signal by Rydberg atoms, and the method comprises the steps: receiving the Rydberg atoms and optical signals prepared in a cesium atom steam chamber by a photoelectric detector, obtaining an electromagnetic induction transparent spectrum, and taking the electromagnetic induction transparent spectrum as an electromagnetic induction transparent background spectrum; the propagation direction of the signal to be measured is perpendicular to the propagation direction of the laser in the cesium atom steam chamber; preparing Rydberg atoms in a cesium atom steam chamber, receiving the electromagnetically-induced transparent spectrum under the influence of the to-be-detected signal by a photoelectric detector, and taking the electromagnetically-induced transparent spectrum as a to-be-detected electromagnetically-induced transparent spectrum; and comparing the to-be-detected electromagnetic induction transparent spectrum with the electromagnetic induction transparent background spectrum, if the spectrum has a signal peak, indicating that the to-be-detected signal has partial discharge, and if the spectrum does not have the signal peak, indicating that the to-be-detected signal does not have partial discharge. And arc signal frequency spectrum measurement without a local oscillation field is realized.

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.

The invention discloses a nut defect detection method based on X-ray imaging, and particularly relates to the field of X-ray nut material internal defect imaging, which comprises the following steps: generating and adjusting an initial light beam of X-rays through a synchronous radiation source, and constructing uniform irradiation field data for nut material detection; acquiring angle scattering light intensity matrix data based on the uniform irradiation field data; and performing phase inversion and sparse constraint optimization on the angle scattering light intensity matrix data to generate electron cloud density optimization distribution data, and constructing density connectivity relation graph data based on the electron cloud density optimization distribution data. By introducing a detection principle of combining high-coherence X-ray scattering imaging based on a synchronous radiation source and electron cloud density disturbance analysis, lossless identification of an early microcosmic physical deterioration region in a nut is realized; the problem that an existing method based on absorption imaging is insufficient in defect detection capacity under the background of weak density gradient and homogeneous component is solved.

A method, system, and computer program product for qubit sharing across simultaneous quantum job and / or model execution. Qubit groups within quantum jobs and / or trained models that match with respect to a starting state and a gate structure are identified. Furthermore, qubit groups that are considered for dynamic quantum job and / or model reset and reuse for another computation during a simultaneous quantum job and / or model execution are identified. Based on such identified qubit groups, a record of potential quantum job and / or model minimizations is created. A potential quantum job and / or model minimization is removed one at a time from the record until the quantum jobs and / or models can be positioned on the coupling map. Once that occurs, single compressed quantum jobs and / or models are generated that each use two or more quantum jobs and / or models that can share qubits based on the current record of potential quantum job and / or model minimizations.

The embodiment of the invention relates to a method for ion implantation simulation, electronic equipment and a storage medium. The method comprises: determining an initial position of each ion in an exposed surface of a simulated semiconductor device; determining first collision data generated by collision between specified reference ions in the ions and material atoms of the semiconductor device in the implantation process; determining second collision data of each other ion based on comparison of surrounding material information of the other ions in each ion and surrounding material information of the reference ion; and determining the distribution condition of each ion in the simulated semiconductor material based on the first collision data and the second collision data. According to the technical scheme, the calculation amount in the simulation ion implantation process can be effectively reduced, the calculation time is remarkably shortened, and the simulation efficiency is improved.

A hybrid quantum-classical (HQC) computer system, which includes a classical computer and a quantum computer, solves linear systems. The HQC computer system splits the linear system to be solved into subsystems that are small enough to be solved by the quantum computer, under control of the classical computer. The classical computer synthesizes the outputs of the quantum computer to generate the complete solution to the linear system.

Systems, components, and methods for detecting characteristic signals are described. A detector includes a detector cell. The detector cell can be configured to generate an electrical signal in response to a particle incident on an active layer of the detector cell, The active layer can define an absorption surface. The detector can include a filter. The filter can include a membrane of carbon material. The filter can be disposed relative to the detector cell to shield the absorption surface from a subset of the incident particles. The subset of the incident particles can include electrons, ions, and photons. The photons can have an energy less than about 40 eV.

The invention provides a double-injection-plane magnetic control injection electron gun. The double-injection-plane magnetic control injection electron gun comprises a focusing electrode, two strip-shaped cathodes, an anode and a magnetic field generation assembly. The focusing electrode comprises two inclined surfaces which extend in the Z-axis direction and are oppositely and obliquely arranged, the two strip-shaped cathodes are respectively arranged on the inclined surfaces of the focusing electrode in parallel, clockwise or anticlockwise rotating inclination is introduced on the inclined surfaces, and the cathodes are configured to respectively escape electrons after being heated; an electric field is formed between the anode and the two strip-shaped cathodes, so that escaped electrons are accelerated to form electron beams; the electron beam rotates under the action of the magnetic field generated by the magnetic field generation assembly so as to form two strip-shaped electron beams, and the included angle between the section, on the XY plane, of the motion trail of the two strip-shaped electron beams and the ZX plane is reduced.

Systems, apparatuses, methods, and computer program products are disclosed for mobile quantum key distribution (MQKD). An example method includes establishing a first connection between a MQKD device and a first device. The example method further includes generating a pair of entangled particles and injecting quantum data that is based on a first particle of the pair of entangled particles into the first device. The example method further includes establishing a second connection between the MQKD device and a host device and injecting quantum data that is based on a second particle of the pair of entangled particles into the host device to facilitate secure communication between the host device and the first device based at least on the pair of entangled particles.

The invention discloses a method and a model for generating a quantum state set, and the method comprises the following steps: adding depolarization noise to any target quantum state through a non-unitary forward process, and converting the target quantum state into a completely mixed state; and de-noising the complete mixed state by using a trainable reverse process, and recovering the complete mixed state to the target quantum state. According to the method, more stable convergence performance is achieved based on the convex optimization method, the pure state and the mixed state can be effectively generated, excellent fidelity is achieved, and the huge potential in the aspect of coping with complex quantum generation tasks is shown.