3336 results about "Quantum electrodynamics" patented technology

The invention discloses a point light source electron accelerator which comprises a sealing box body, a cathode, a laser emitter, a reflecting cover, a grid plate and a mounting plate, the mounting plate is erected in the sealing box body, a mounting hole is formed in the mounting plate, the cathode is mounted in the mounting hole, and the laser emitter is arranged in the sealing box body. The reflecting cover is arranged at the top of the mounting hole; the reflecting cover is a semi-spherical surface, a laser through hole is formed in the top of the semi-spherical surface, and the laser through hole is coaxial with the cathode; the transmitting end of the laser transmitter is aligned with the cathode; the grid plate is mounted below the mounting plate and is aligned with the mounting holes; and an electron outlet is formed below the grid plate. The invention provides a point light source electron accelerator, and the point light source electron accelerator provides a light and miniaturized electron accelerator design, so that the application field of the accelerator is wider.

A control system for a network of quantum systems operates the network to perform quantum informatics processing. The control system includes an entanglement scheduler configured to identify operations for which entanglement of two or more of the quantum systems is desired, identify plural potential entanglement attempts for generating the entanglement; and schedule at least some of the potential entanglement attempts to be performed to generate the entanglement for at least one of the operations. The entanglement scheduler may use direct entanglement, entanglement swapping and / or quantum teleportation approaches to generate the entanglement. The entanglement scheduler may schedule probabilistic entanglement attempts based at least in part on the probability of success of the entanglement attempts. The entanglement scheduler may generate entanglement to support plural branches of a quantum informatics process and / or to respond to events occurring while the quantum informatics process is executing.

This invention provides a Rydberg-atom based electromagnetic field detector array comprising a plurality of Rydberg-atom based electromagnetic field detectors, wherein each Rydberg-atom based electromagnetic field detector is divided into a plurality of units, each unit of the plurality of units being either: a variable transparency unit configured to vary its transparency by the Electromagnetically Induced Transparency, EIT, effect and further vary its transparency in response to an incident electromagnetic field, or a separator unit, wherein a sequence of one or more variable transparency units and one or more separator units of the plurality of units for a Rydberg-atom based electromagnetic field detector uniquely identifies that Rydberg-atom based electromagnetic field detector in the Rydberg-atom based electromagnetic field detector array.

Development of technologies for effectively suppressing edge localized modes (ELM), maintaining core plasma stability, controlling plasma rotation, adjusting edge transport barriers, achieving smooth transitions between different plasma regimes, minimizing error magnetic fields, sustaining plasma for long periods, stabilizing fusion power, controlling plasma impurities, and optimizing plasma-wall interactions simultaneously in tokamak fusion reactors. [Solution] We provide an adaptive edge-localized 3D magnetic field control system that organically links a real-time plasma state monitoring system, a 3D magnetic field response prediction model, a flexible 3D coil system, an adaptive control algorithm, a plasma regime transition management system, an integrated control interface, a high-precision magnetic diagnostic system, a fusion power control system, a plasma impurity control system, and a plasma-wall interaction optimization system.

The invention discloses a mixed gas absorption spectrum analysis method and system based on variational mode decomposition, specific laser is injected into an optical resonant cavity unit, and a detector unit continuously monitors the light intensity change and records a light intensity attenuation signal; pre-processing the recorded light intensity attenuation signal; carrying out VMD decomposition on the preprocessed ring-down signal to obtain a plurality of IMF components, respectively introducing CO2 and CO gases with known concentrations into the optical resonance unit, and recording spectral data of each single gas component; calculating the similarity and contribution degree of each IMF component, and setting a weight combination to form a joint score; the gas with the highest joint score is selected, the score is compared with an adaptive threshold value, and when the score is higher than the adaptive threshold value, the IMF component is marked as the characteristic component of the corresponding gas; and finally, gathering and outputting the marked IMF components according to gas types to obtain characteristic signals of the gases, thereby realizing multi-component gas separation in the mixed gas absorption spectrum.

Provided are computer-implemented methods and quantum computing systems for preparing computational states representing quantum states of a physical system, including performing a computational evolution of the state and then determining physical properties of the system using the time-evolved computational state. Hamiltonian dynamics of observables are computed on a quantum computer to provide information about the physical system represented by the Hamiltonian. Low energy electronic structure states of a physical system are prepared using adiabatic evolution. The energy of an equilibrium quantum state of a physical system is determined using a time-evolution operator. The energy of an eigenstate of a physical system is indirectly determined by evaluating expectation values of a time-evolution operator averaged across multiple shots for randomly-generated quantum circuits. Example methods enable calculation of the energy of an evolved computational state with chemical accuracy, due to avoiding discretization errors, with a smaller circuit depth than known alternatives.

The invention relates to the technical field of quantum computing, and provides a linear complexity quantum state preparation method based on tensor decomposition and a quantum circuit construction system.The high-dimensional tensor is decomposed into a series of low-rank core tensors through continuous singular value decomposition, each core tensor in a core tensor sequence is expanded into a unitary matrix, and the unitary matrix is used as a quantum circuit; the unitary matrix sequence is mapped to quantum lines coupled using adjacent qubits, and the quantum lines are run to prepare a target quantum state. Based on this, the line generated by the method can approximately or accurately prepare a target quantum state only by coupling adjacent quantum bits, and is perfectly adaptive to quantum chips of linear or grid topologies such as superconducting and semiconductor quantum dots and the like.

The invention discloses an implementation method of a quantum logic gate and a quantum computer system. The method comprises the following steps: preparing a quantum bit to a preset initial quantum state; according to the Hamiltonian corresponding to the quantum logic gate, respectively generating microwave signals corresponding to each segment in the Hamiltonian; the Hamiltonian of the quantum logic gate comprises at least two segments, and the at least two segments are used for enabling quantum bits to generate at least one polarity reversal in evolution; the generated microwave signals corresponding to all the segments are spliced; and applying a spliced microwave signal to the quantum bits in the initial quantum state, so that the quantum bits evolve from the initial quantum state to a target quantum state. According to the invention, the quantum bit can generate at least one polarity change in evolution, partial phase dispersion is offset by using the polarity characteristic of 1 / f noise, decoherence is inhibited, and the fidelity of the single-bit quantum logic gate is further improved.

A method, system, and computer program product for mapping a quantum circuit to a quantum processor. A light cone analysis is performed on the quantum circuit. A light cone refers to a map of the effects that the circuit operations have on the final observable value. Circuit operations that fall outside or within one or more light cones of non-identity operators in an observable based on the light cone analysis on the quantum circuit are then determined. The greater the number of overlapping or individual light cones that such circuit operations lie within, the greater the impact that such circuit operations have on the final observable value. A circuit mapping of the quantum circuit on the quantum processor is then determined based on the determination of which circuit operations fall outside or within the one or more light cones of non-identity operators in the observable.

Modular Rydberg architectures for fault tolerant quantum computing are provided. A first array and a second array of neutral atoms are provided. Each neutral atom has a first state and an excited Rydberg state. Each neutral atom is arranged to impose a Rydberg blockade on at least its nearest neighbors in its array when in the excited Rydberg state, thereby implementing a plurality of physical qubits. Each array comprises data qubits, and syndrome qubits. The syndrome qubits are configured to implement a quantum error correcting code with respect to the data qubits. Each array includes a subarray of communication qubits having a lower dimensionality than the array. Each communication qubit of the first subarray forms a Bell pair with one communication qubit of the second subarray. The first and second arrays of neutral atoms are configured to interact with each other only via the communication qubits.

Systems and techniques may generally be used for modifying quantum entangled bit communication. An example technique may include generating, at a first node in a computing network, a random number using a quantum derived seed as input to a random number generator; modifying a program using the random number while maintaining a function output of the program for a given input; receiving, at the first node from a second node, an input based on the random number; and executing the modified program at the first node using the input to obtain an output consistent with the program in an unmodified state.

An information processing apparatus causes a quantum computer to perform a first gate operation in accordance with an ancilla state generation circuit representing a procedure of generating a code including a logical qubit representing an ancilla state and a gauge qubit representing a redundant degree of freedom other than the ancilla state. Next, the information processing apparatus causes the quantum computer to perform a second gate operation in accordance with an error detection circuit representing a procedure of detecting an error occurring in a plurality of physical qubits constituting the code generated by the first gate operation. Then, the information processing apparatus determines the presence or absence of the error on the basis of a measurement value obtained by the second gate operation, the measurement value indicating the state of the gauge qubit.

The classical channel employs a transmit laser and classical modulator. The quantum channel employs a nonlinear medium and spontaneous parametric down conversion producing quantum entangled signal and idler photon pairs which are encoded. The classical and quantum channels are combined to define a propagated hybrid signal. The receiver splits the hybrid signal on basis of wavelength into classical and quantum channels. The quantum receiver employs optical parametric amplification, supplied with energy from a second harmonic generation device synchronized to the classical carrier wavelength. A photodetector and extracts a quantum message from the quantum signal.

The invention discloses an all-optical vortex beam orbital angular momentum mode identification method and system, and relates to the field of optical information processing and optical computing, and the method comprises the steps: S1, constructing a multi-layer architecture all-optical diffraction network; s2, dividing the output detection surface after the diffraction network into a plurality of preset space regions; s3, the vortex light beams carrying orbital angular momentum OAM information sequentially penetrate through the all-optical diffraction network, spatial evolution of a light field in the propagation process is completed, and vortex light classified according to intensity distribution is output; s4, mapping the topological charges of the vortex light to different sub-regions of the detection surface in an intensity distribution form; and S5, performing intensity acquisition on each area on the detection surface through a detector, and determining an OAM mode type of the input light field based on the mode number corresponding to the area with the maximum light intensity. The method is used for performing high-robustness identification on the orbital angular momentum vortex light mode of the vortex light in the presence of a random phase scattering medium.

The invention relates to the technical field of high-voltage electric appliance detection, in particular to a device and method for detecting the vacuum degree of a vacuum arc-extinguishing chamber, and the method comprises the steps: arranging a field emission cathode on one metal end cover of the vacuum arc-extinguishing chamber; an anode is arranged on the metal shielding cover close to the field emission cathode in the vacuum arc-extinguishing chamber; the high-voltage direct-current power supply is connected to the field emission cathode and the anode and is used for applying voltage to the electrodes so as to drive the field emission cathode to emit electron beams to impact the anode; the X-ray energy spectrum detector directly faces the anode, the X-ray energy spectrum detector is used for measuring bremsstrahlung X-ray energy spectrum generated when the electron beam impacts the anode, an electron emission source is actively arranged in the arc extinguish chamber, and the distribution of the X-ray energy spectrum generated by the electron emission source is measured. And high signal-to-noise ratio, high-precision and high-sensitivity vacuum degree quantitative detection is realized by utilizing the strong correlation between the energy spectrum form and the internal gas pressure.

Systems, methods, and computer-readable media of implementing a qubit gate for non-classical computing include implementing a qubit gate on a qubit of an array of qubits, wherein qubit states of said qubit are within a metastable manifold, wherein said qubit states are nuclear spin states, and wherein said qubit gate comprises a multi-photon transition through an intermediate metastable state.

The invention relates to the technical field of electron energy measurement, and discloses an electron spectrometer and an electron energy spectrum measurement method and system.The electron spectrometer comprises a magnetic deflection unit used for receiving an incident to-be-measured electron beam, generating a magnetic field and applying the magnetic field to all to-be-measured electrons in the to-be-measured electron beam; the scintillator fluorescent screen is arranged at the downstream of the magnetic deflection unit and used for receiving the deflected electrons to be detected, and the electrons bombard the scintillator fluorescent screen and generate light spots; the optical acquisition unit is used for acquiring a light spot image on the scintillator fluorescent screen; and the signal processing unit is used for processing the light spot image so as to identify the spatial position information of the light spot in the light spot image and convert the spatial position information into electronic energy data. The method has the beneficial effects that the unification of high resolution and high measurement efficiency is realized, and the problem of signal accumulation under a high counting rate of a traditional direct measurement method and the inherent defect of low efficiency of a scanning type magnetic spectrometer are overcome.

The invention discloses a vortex beam orbital angular momentum detector based on surface plasmon and a detection method, and belongs to the field of micro-nano photonics and photoelectric detection. The detector is based on a plane photoelectric detector of a metal-semiconductor-metal type, a vortex light field beam splitting structure is arranged on a metal electrode on one side of the detector or between two metal electrodes, the vortex light field beam splitting structure comprises an incident coupling grating, an incident light field carrying different orbital angular momentums can be split into plasmons in different directions, and the plasmons in different directions can be split into a vortex light field. The single detector resolution of the orbital angular momentum of the vortex beam is realized through the direction and propagation loss difference of plasmons. The detector is compatible with an existing semiconductor technology, the structure is simple, vortex light beams carrying high-order orbital angular momentum can be detected, and the rotation direction of a vortex light field can be detected.

The invention provides a neutral atom beam generation device and a neutral atom detector calibration device. The neutral atom beam generation device comprises an ion beam generation device used for emitting a mixed beam; the particle energy testing device comprises an incident end, a first emergent end, a second emergent end and an acquisition device, the incident end is used for receiving the mixed beam; the incident end is communicated with the second emergent end through an arc-shaped channel, and a deflection magnetic field is arranged at the arc-shaped channel, so that positive ions in the mixed beam flow deflect and bombard the acquisition device; the acquisition device is used for acquiring a first bombardment position of positive ions; the first emergent end is used for emitting a first ion beam; the processing device is connected with the collecting device and used for determining the deflection radius of the positive ions according to the first bombardment position and determining the energy of the positive ions and the neutral atoms according to the deflection radius; and the particle screening device is used for absorbing positive ions and negative ions in the first ion beam so as to emit a neutral atom beam.

The invention provides a relaxation time measuring method and system. The relaxation time measuring method comprises the following steps: heating an atomic gas chamber to be measured to a set working temperature, and applying a static magnetic field in a z direction to the atomic gas chamber to be measured; starting the pumping laser light source and the detection laser light source, and performing light path alignment adjustment; the pumping laser light source is used for polarizing alkali metal atoms in the atomic gas chamber to be measured; determining a relaxation time measurement mode according to a relaxation time measurement requirement, triggering a corresponding operation, and collecting a corresponding relaxation signal; the measurement mode comprises at least one of the following modes: an alkali metal electron spin transverse relaxation mode, an alkali metal electron spin longitudinal relaxation mode, an inert gas nucleon spin transverse relaxation mode and an inert gas nucleon spin longitudinal relaxation mode; and fitting the relaxation signal corresponding to the mode to obtain a corresponding relaxation time value. According to the invention, the transverse and longitudinal relaxation time of alkali metal electrons and the transverse and longitudinal relaxation time of inert gas nucleons can be measured on the same machine.

A quantum processor is discussed. the quantum processor having a flux compensation circuit communicatively coupled to a first qubit. The flux compensation circuit includes a quantum flux parametron (QFP) flux pump circuit with a first QFP in communication with the first qubit and a storage circuit with a second Josephson junction and a storage loop coupled in series with the QFP flux pump circuit. The communication between the QFP flux pump circuit and the storage loop is mediated by the second Josephson junction. A first control line is in communication with the first Josephson junction and a second control line is in communication with the second Josephson junction. In use. flux stored in the storage loop back acts on the first qubit.

The invention discloses an ion trap quantum computing system and device, a control method and a storage medium. The system comprises a target ion storage area formed by a quantum charge-coupled device, a control area, a combination area communicating the target ion storage area and the control area, and a collaborative cooling ion storage area collinearly arranged with the control area, wherein the control area is located between the combination area and the collaborative cooling ion storage area; the target ion storage area is used for storing target ions and moving the target ions to the control area through the binding area; the collaborative cooling ion storage area is used for storing collaborative cooling ions and moving the collaborative cooling ions to the control area; and the control area is used for enabling the collaborative cooling ions to carry out collaborative cooling on the target ions, moving the collaborative cooling ions out of the control area after collaborative cooling is completed, and then executing quantum logic gate operation on the target ions. According to the scheme, the problem of quantum state dephasing noise enhancement caused by collaborative cooling can be solved.

The invention discloses a broadband circularly polarized magnetoelectric dipole antenna with superposed Ka-band radiation modes, and belongs to the field of radio frequency front-end devices. The antenna is composed of an electric dipole patch composed of a rectangular patch and a stepped patch, a magnetic dipole radiator composed of four metal columns, an H-shaped slotted coupling floor, a feeder line, coaxial feed metal columns, an SIW structure, a metal ground backboard, an upper dielectric substrate, a lower dielectric substrate and a pp bonding layer, an antenna unit is subjected to 4 * 4 arraying, and the circularly polarized radiation performance of the antenna unit is verified. According to the invention, the circularly polarized wave beam range is wide, and the axial ratio bandwidth is 3GHz to cover the complete working frequency band. After the array is formed, the active S parameters of the array elements are well matched, and the excellent axial ratio performance is still achieved during beam scanning.

The invention relates to the technical field of optical control, in particular to a micro-nano particle optical control method and device based on circularly polarized light. The invention aims to solve the problem of insufficient flexibility of optical control. The optical control method comprises the following steps: pre-processing micro-nano particles to be controlled; the initial Gaussian beam is processed into a circular polarization tube type beam through a beam shaping module, a light guiding module and a polarization regulation and control module, and the micro-nano particles are irradiated from the position above the gas-liquid interface according to a preset mode; by adjusting the polarization regulation and control module and the light guide module, the motion direction, the motion speed and the stop position of the micro-nano particles are optically controlled. The optical control device comprises a control platform module, a laser emitting module, a light beam shaping module, a light guiding module, a polarization regulation and control module and an imaging monitoring module.

This disclosure relates to quantum computing systems including a quantum processor that implements one or more operations on multiple qubits and a distributed data processing system programmed to perform calculations to determine control sequences that, when applied to the quantum processor, reduces decoherence, decoherence-induced errors, and control-imperfection-induced errors on the one or more operations on the multiple qubits. A user interface device remote from the distributed data processing system receives from a user of the quantum processor characteristics of the quantum processor including operational constraints and / or desired performance, and sends the characteristics to the data processing system to cause the data processing system to perform the calculations to determine the control sequence based on the characteristics.

Methods, systems, and apparatus for microwave pulse distortion compensation using reflection parameters from error amplification pulse sequences. In one aspect, a method includes generating a pre-distorted control signal that implements a single qubit rotation operation and applying the pre-distorted control signal to a qubit to perform the rotation operation on the qubit. The pre-distorted control signal comprises an inverted transfer function, where the inverted transfer function comprises values of parameters obtained through fitting measured qubit parasitic rotation angles per gate to a reflection model that models pulse distortion in the quantum computing device; and the qubit parasitic rotation angles per gate are measured using a first pulse sequence that amplifies out-of-phase pulse distortion in the quantum computing device and a second pulse sequence that amplifies in-phase pulse distortion in the quantum computing device.

The invention discloses a quantum partial discharge detection system and method based on single photon measurement. The system comprises a photoelectric detection module and an information transmission and processing module which are connected in pairs. A free space light collection unit in the photoelectric detection module is used for converging photons of partial discharge radiation and guiding the collected photons to a classic weak light detection unit and a single photon detection unit respectively; the classic weak light detection unit is used for converting an optical signal into an electric pulse signal based on an internal photoelectric effect; the single-photon detection unit is used for detecting extremely weak light and even single-photon events and outputting discrete electric pulse signals. The classical weak light detection unit and the single photon detection unit operate in parallel, partial discharge optical detection with a wide dynamic range and a high signal-to-noise ratio is realized through a signal fusion and processing algorithm, electromagnetic interference is effectively inhibited, and a more comprehensive and reliable monitoring means is provided for evaluation of the insulation state of power equipment.

Disclosed is a decoupling dipole structure that renders a midband dipole effectively transparent to a nearby lowband dipole. This not only improves the beam quality in the lowband without sacrificing beam quality in the midband, it also enables different lowband dipoles to be employed to customize the lowband performance of the multiband antenna without requiring a redesign of the midband dipoles or of the array face.

A method to operate an ion implanter. The method may include conducting an ion beam into an acceleration stage of a linear accelerator in the ion implanter, where the ion beam is a bunched ion beam. The method may also include applying an RF signal to the acceleration stage while the ion beam passes through the acceleration stage, the RF signal comprising a determined frequency and a determined amplitude, and performing a phase scan using the RF signal. The phase scan may include varying a phase of the RF signal at the acceleration stage over a plurality of phase values; and recording a plurality of arrival times at a monitor, situated downstream of the acceleration stage, the plurality of arrival times corresponding to the plurality of phase values, respectively.

Nanostructured chiral microparticles with bowtie shape having widely variable pitch, size, thickness and length are provided. The self-limited assembly of anisotropic building blocks makes possible high synthetic reproducibility, size monodispersity and computational predictability of their geometries for different assembly conditions. They display multiple strong circular dichroism peaks originating from absorptive and scattering phenomena. Unlike classical chiral molecules, these particles display a continuum of Osipov-Pickup-Dunmur chirality measures that exponentially correlate with the spectral positions of the circular dichroism peaks. Bowtie particles with variable polarization rotation were utilized in printing photonically active metasurfaces with spectrally tunable positive / negative polarization signatures for light detection and ranging (LIDAR) devices.