177 results about "Photon source" patented technology

A method for assembling a photonic computing system includes attaching a photonic source to a support structure, and attaching a photonic integrated circuit to the support structure. The photonic source includes a first laser die on a substrate configured to provide a first optical beam, and a second laser die on the substrate configured to provide a second optical beam. The photonic integrated circuit includes a first waveguide and a first coupler coupled to the first waveguide, and a second waveguide and a second coupler coupled to the second waveguide. The method includes attaching a plurality of beam-shaping optical elements to the support structure, the substrate, or the photonic integrated circuit, in which the attaching includes aligning a first beam-shaping optical element during attachment so that the first optical beam is coupled to the first coupler, and aligning a second beam-shaping optical element during attachment so that the second optical beam is coupled to the second coupler.

The waveguide carrying a nonlinear crystal with reflective interface, a pump photon source and a circulator define an optical parametric amplifier which uses optical power from the pump photons to boost incoming signal and idler photons which carry the encoded signal. The nonlinear crystal performs optical parametric amplification upon the incoming optical signal in a quantum photonic process that generates additional signal and idler photons to thereby boost the intensity of the incoming signal. A photodetector is coupled for communication with the third port and operative to convert the reflected optical signal into an electrical signal defining the output of the communications receiver.

The invention relates to the technical field of diamond color center quantum light sources, in particular to a method for preparing a diamond color center in a positioning mode, and the method comprises the following steps that a single-face polished sapphire sheet serves as a substrate, and a microwave plasma chemical vapor deposition method is adopted for preparing a single crystal diamond with a (001) surface; preparing a metal layer on the surface of the monocrystal diamond by adopting a physical vapor deposition method, and dehumidifying and self-assembling to form balls; etching the surface of the monocrystal diamond (001) at a high temperature in a hydrogen atmosphere to form a conical pit structure with a different surface; and selectively growing a diamond color center in the cone pit by adopting a chemical vapor deposition method. Aiming at the problems that the existing ion implantation technology for positioning and preparing the diamond color center is difficult to realize nanoscale accurate control and high in cost, a foundation is laid for the integration and low-cost preparation of the high-purity and high-brightness diamond single photon source.

A single photon source device is proposed. The device may include a reflection layer including a base portion and a recessed portion having a concave shape that is recessed from the base portion, a single emitter disposed within the recessed portion of the reflection layer and configured to emit a single photon, a solid resonator configured to fill the recessed portion to surround the single emitter, and a solid immersion lens portion disposed on the solid resonator to surround the solid resonator.

The invention discloses a source device independent quantum key distribution method, device and system and a network thereof, and belongs to the technical field of quantum key distribution. In order to solve the problem that an existing quantum key distribution protocol depends on a source end security hypothesis and is difficult to defend unknown source side attacks, the invention provides a source equipment-independent quantum key distribution protocol. Through the physical characteristics of the non-classical quantum light source and a pairing method after measurement, the security hypothesis of source end equipment is removed, known and unknown source side attacks can be effectively resisted, and the quantum advantages in the aspects of security and performance expression compared with a classical laser source are realized. The invention further provides a method for directly expanding the point-to-point protocol to the multi-user quantum key distribution network, compared with an existing quantum network based on an entangled photon source, the complexity of an experiment system and the requirement for equipment are reduced, and the method is suitable for long-distance and high-safety quantum communication and quantum network deployment.

The invention provides a Rydberg atomic electromagnetic signal detection device based on correlated photon coincidence measurement, and the device comprises a correlated photon source assembly which is used for enabling single-polarization and frequency-stable laser to generate polarization orthogonal correlated photon pairs; the Rydberg atom preparation system is in communication connection with the associated photon source assembly, and associated photon pairs emitted by the associated photon source assembly enter the Rydberg atom preparation system; the correlation detection assembly is in communication connection with the Rydberg atom preparation system and is used for counting transmission photons of the EIT-AT split transmission spectrum signals, and when the difference value between the reference photon arrival time and the transmission photon arrival time is within a preset range, the EIT-AT split transmission spectrum signals are regarded as coincidence events and coincidence counts are recorded. According to the invention, the problem of low sensitivity caused by the defects of optical readout noise, weak off-resonance field response, sensitive temperature drift vibration environment and the like in the prior art is solved.

The invention discloses an optical communication band all-fiber portable frequency entangled two-photon source comprising a pump light source assembly used for generating pump light with a preset wavelength; the filter is connected with the pump light source assembly through a polarization maintaining optical fiber and is used for ensuring the purity of the pump light; the PPLN waveguide is connected with the filter through a polarization maintaining optical fiber and is used for converting the pure pump light into a target entangled photon pair and residual pump light; the filtering and beam splitting assembly is connected with the PPLN waveguide through a polarization maintaining optical fiber with a preset wave band, and is used for removing residual pump light and losslessly separating obtained pure photon pairs into two different light paths; and the output interface comprises a first flange and a second flange, and the first flange and the second flange are respectively connected with the two different optical paths of the filtering and beam splitting assembly through polarization maintaining optical fibers and are used for outputting pure entangled photon pairs.

An interferometric module, constructed in single pentagonal block to produce high quality, robust, low cost entangled-photon sources enabling polarization entanglement swapping. The compact block forms a generic platform that facilitates a comprehensive integration of optical components while allowing for quick optical alignments. Phase-stability of the self-balanced Sagnac interferometer is harnessed to offer a highly stable performance at room temperature and under sever operating conditions. High-quality entanglement is inherently achieved by equalizing two interferometric optical paths from counter-propagating photons. A periodically poled nonlinear crystal is placed between two half-wave plates, which also serve to correct the polarization states of the photons. The result is compensation-free and plug-and-play entangled-photon sources for quantum routers, distributed quantum sensing and quantum telecommunication. Wavelengths and generation rate of photon pairs are realized via the hosted crystal. Energy and polarization entanglement, and hyperentanglement can be remotely set by rotating the polarization state of the pump laser diode.

The invention discloses an OpenMC-based BNCT dose full-process automatic calculation output method, and particularly relates to the technical field of boron neutron capture therapy dose calculation, and the method comprises the steps: reading a DICOM-CT image, automatically completing HU value segmentation, material assignment and voxel grid modeling, and generating an OpenMC geometry and material input card; setting a neutron / photon source, an operation mode and a counting grid, and executing Monte Carlo transport calculation; an ICRP flux-dose conversion coefficient library is built in, and dose calculation is automatically completed; the dose field is written into an Rt dose file, and the Rt dose file can be directly imported into mature medical image processing software for visual evaluation and plan optimization. According to the method, end-to-end automation from the CT image to the clinical available dose file is achieved, manual intervention is not needed, the BNCT dose calculation efficiency, precision and standardization level are remarkably improved, and a reliable tool is provided for BNCT dose simulation research.

The application discloses a single-photon source anti-bunching measurement device and method, relates to the technical field of single-photon detection, and comprises a single-photon source module, a signal trigger light path module, an interference light path module, a single-photon detector module and a coincidence counting module. The single-photon detector module comprises a first gated single-photon detector, a second gated single-photon detector, a first single-photon detector and a second single-photon detector, and can realize accurate measurement of the anti-bunching value of a deterministic single-photon source and a heralded single-photon source.

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.

This application discloses a high-dimensional encoded quantum random number generator and a method for generating quantum random numbers. The high-dimensional encoded quantum random number generator includes an entangled photon source, a wavelength splitter, at least one photon encoding and detection module, and a data processing module. The photon encoding and detection module includes a first filter, a second filter, a dispersive device, a beam splitting module, a first photon detector, a second photon detector, and a third photon detector. This application uses multiple photon processing through the dispersive device and the beam splitting module to perform high-dimensional time encoding on a single photon. Under the condition of entangled photon pairs at the same rate, a single photon can be converted into a quantum random number with a higher number of bits, thereby improving the random number generation rate.

A system and method for determining a level of an analyte parameter, comprising: causing a photon source to send photons to a probe sensitive to an analyte, exciting the probe to emit light; receiving optical data from a photodetector based on the light emitted from the probe; determining a difference between a first level of the analyte parameter at a first location adjacent to a first surface of the probe and an intermediate level of the analyte parameter at an intermediate location between the first location and a second location adjacent to a second surface of the probe; and determining a second level of the analyte parameter adjacent to the second surface of the probe based on the difference between the first level of the analyte parameter and the intermediate level of the analyte parameter.

Methods and apparatus for using exempt gamma photon sources to measure fluid properties are described herein. The gamma photon sources are used with detectors in an arrangement that provides a short photon path length between source and detector. Fluid measurement devices described herein have a fluid container defining an interior, an exempt gamma-ray source located outside the fluid container, and a gamma-ray detector located outside the fluid container, the exempt gamma photon source and the gamma-ray detector defining a photon path that traverses the interior of the fluid container along a non-diametric chord of the fluid container.

A photonic integrated circuit (PIC) with a first structure of a ordinary optical material is enhanced with a second structure of a nonlinear optical material. The second structure provides or enhances nonlinear optical effects within the PIC. The first structure and the second structure may be in distinct layers. The first structure may be directly over and in contact with the second structure. Alternatively, the first structure and the second structures may be evanescently coupled while being vertically separated by a layer of cladding material. Lateral spacing may be used in combination with vertically spacing to precisely control a degree coupling between the first structure and the second structure.

A photon source comprising:a quantum dot; and an optical cavity,the optical cavity comprising:a diffractive Bragg grating “DBG”; anda planar reflection layer,the DBG comprising a plurality of concentric reflective rings surrounding a central disk and at least one conductive track extending from the central disk across the plurality of concentric rings, the quantum dot being provided within the central disk and the planar reflection layer being provided on one side of the DBG to cause light to be preferentially emitted from the opposing side of the DBG.

Disclosed is a multi-entangled photon source-based multi-level user quantum key distribution network and distribution method. Bandwidth requirements can be effectively dispersed by introducing a plurality of entangled photon sources, enabling a quantum entanglement-based quantum secure communication network supporting a plurality of users to be possible. When arranging the second-level photon source, problems of transmission loss and quantum key rate decline caused by an excessively long distance between users in a same user group and a central entangled photon source can be effectively alleviated. Under a multi-user hierarchical framework, the pressure of the central photon source has been further reduced, which provides the possibility for building an entanglement-based secure communication network with more users and a wider range.

The invention relates to a node of a network, wherein the node comprises a monolithically integrated entropy source comprising: a photon source designed to emit photons, wherein the photon source comprises a first housing, wherein the first housing is formed by a first bottom face, a first top face and at least one first side face interconnecting the first bottom face and the first top face; and a photon detector designed to detect photons emitted by the photon source, wherein the first bottom face of the photon source is arranged towards the photon detector.

A method includes receiving input light having an input wavelength in a first optical resonator for causing resonance of the input light in the first optical resonator. The first optical resonator includes a non-linear optical medium. The method also includes converting at least a portion of the input light to a combination of first output light having a first output wavelength that is different from the input wavelength and second output light having a second output wavelength that is different from the input wavelength and the first output wavelength by passing the input light through the non-linear optical medium. The method further includes causing resonance of the first output light and the second output light in a second optical resonator. A portion of the first optical resonator is coupled to a portion of the second optical resonator.

Photonic quantum random number generators (QRNGs) that may natively generate entropy of a desired distribution (e.g., according to a desired PDF) are disclosed. These photonic QRNGs may comprise a photon source coupled to a Mach-Zehnder Modulator (MZM) array comprising a set of MZMs. This array of MZMs can be coupled to a photodetector array comprising a set of photodetectors. An extractor can be coupled to the photodetector array where the extractor is adapted to produce values based on detection of photons at the photodetector array. The MZM array can be tuned to achieve a desired distribution of entropy.

The invention discloses a quantum key distribution eavesdropping detection system and method based on an improved BB84 protocol and an AI doorkeeper, and the method comprises the steps: adding two new polarization bases on the basis of two polarization bases of a rectangular coordinate system L and a diagonal coordinate system N of the BB84 protocol, and forming a set of four polarization bases; an LSTM network based on a self-attention mechanism and an SVM optimized through principal component analysis are adopted to carry out eavesdropping detection at the same time, and detection results of the eavesdropping detection and the SVM optimized through principal component analysis are fused to obtain probability distribution of attack existence. According to the invention, the security and practicability of the BB84 protocol can be improved, and the eavesdropping detection capability and efficiency of an AI entrance guard can be enhanced. According to the method, the performance of the light source and the detector is further optimized, the single-photon source closer to the ideal and the high-efficiency and low-noise single-photon detector are adopted, the misjudgment and information leakage risks can be further reduced, and the accuracy and the detection rate of eavesdropping detection can be further improved by optimizing the SVM through grid search.

The invention relates to a lighting device (DE) with which a vehicle is equipped, the lighting device comprising a photon source generating photons, a first light guide (GL1) receiving the generated photons with a view to delivering them to a first front face (FV1) in a first general direction, and a second light guide (GL2) of flat type, receiving on a rear face (FR2) the photons delivered to the first front face (FV1) with a view to delivering them to a second front face (FV2) that is inclined with respect to the first general direction. The first light guide (GL1) comprises, in proximity to at least one end (E1, E2) of the first front face (FV1), a projecting portion (PS1, PS2) comprising an auxiliary front face (FVA1, FAV2) delivering in the direction of the rear face (FR2) generated photons in at least one auxiliary general direction that is inclined with respect to the first general direction.

Bright entangled photon sources including an alignment-free, fiber-based, mechanically-rugged and generic interferometric module are disclosed. The inherent phase-stability of a Sagnac interferometer is deployed. High down-conversion efficiency of periodically poled nonlinear-waveguides is combined with the optical gain of semiconductor optical amplifiers and immunity of fiber optics. A single compact interferometric engine combines these attributes, allowing highly stable, integrable and bright polarization entangled-photon sources operating at room temperature. Using a minimum number of in-line optical parts, the compact module is based on a novel method that enhances the long-term stability and efficiency without compromising the entanglement quality. Besides energy entanglement, polarization entanglement is presented and set through the operational conditions. An optional periodically poled nonlinear waveguide can be hosted to achieve the desired spectral bandwidth and photons generation rate. The result is a zero-maintenance, lightweight, low-power consumption engine of compact and fully-integrable bright polarization-entangled photon sources.

The present invention belongs to the field of quantum communication technology, and in particular relates to a correlation imaging device based on a high-order correlation light field and a control method thereof. The correlation imaging device based on a high-order correlation light field includes a correlation photon source module, a photon beam amplification module, an imaging scanning module, and a photon detection module arranged along the propagation direction of the light path; the correlation photon source module is used to generate a correlation photon source; the photon beam amplification module is used to amplify the light source generated by the correlation photon source module; the imaging scanning module is used to scan the object in front of the reflector in the reference light path along the scanning light path, and the output light path of the imaging scanning module is divided into two paths; the photon detection module is used to receive light from the imaging scanning module for coincidence measurement and counting. The present invention utilizes two-photon composite detection to restore the spatial information of the object to be measured, realizing the separation of detection and imaging. It has the characteristics of non-locality and strong anti-interference ability, and has broad application prospects.

A lighting device (LD) is fitted to a vehicle and comprises a photon source that generates photons, a first light guide (GL1) that receives the generated photons and delivers them to a first front face (FV1) in a first general direction, and a second, flat light guide (GL2) that receives the photons delivered to the first front face (FV1) on a rear face (FR2) and delivers them to a second front face (FV2), inclined relative to the first general direction. This first light guide (GL1) includes, near at least one end (E1, E2) of the first front face (FV1), a projecting portion (PS1, PS2) with an auxiliary front face (FVA1, FAV2) that delivers generated photons towards the rear face (FR2) in at least one auxiliary general direction inclined relative to the first general direction. Figure 2

The application discloses a wave-particle duality demonstration teaching device, and relates to the technical field of wave-particle duality demonstration teaching, which comprises a wave-particle duality device and an upper computer software operating system, wherein the wave-particle duality device comprises a single-photon source system, a combined prism system, a photon collection system and an electronic control system; the combined prism system comprises a first prism, a second prism and a light shield; the first prism and the second prism make the second polarized light output by the single-photon source system carry out Mach-Zehnder interference under the set adjustment angle of the light shield, and an interference light path is obtained; the electronic control system is used for counting the photons detected by a single-photon detector; and the upper computer software operating system displays the detection result. The wave-particle duality can be directly demonstrated through the wave-particle duality device and the upper computer software operating system, and the change of the photons can be observed only by adjusting the light shield, so that the operation is convenient.

A quantum circuit includes a plurality of first optical waveguides and a plurality of second optical waveguides formed on a substrate and each of which includes a single-photon source; a first multiplexer formed on the substrate and configured to condense first photons propagated through the plurality of first optical waveguides; a second multiplexer formed on the substrate and configured to condense second photons propagated through the plurality of second optical waveguides; a branching element configured to introduce the first photons condensed by the first multiplexer and the second photons condensed by the second multiplexer and branch the first photons and the second photons in a first direction and a second direction; a first detector configured to detect the first photons and the second photons branched in the first direction; and a second detector configured to detect the first photons and the second photons branched in the second direction.

The application discloses a self-absorption correction method and device for unknown component radioactive samples, belongs to the technical field of radioactive source detection, and places a gamma radioactive source in a groove at the upper end of an upper fixed plate, so that the gamma radioactive source serves as a photon source; places an empty sample cylinder at the upper end of a lower fixed plate, at this time, the photons emitted by the gamma radioactive source pass through the cylinder through the channel in the inner lead body and are then received by a detector, and the peak area net count rate N1 corresponding to the ray energy is calculated by spectrum analysis. When the application is used, nondestructive measurement can be achieved, compared with the traditional X-ray fluorescence method (XRF), the application does not need to destructively process the radioactive substances to be detected to obtain a sample matrix, and can truly realize nondestructive measurement; the cost is reduced; the traditional method needs to use X-ray fluorescence to detect the sample components, and the method further increases the cost, and the application only needs a lead collimator to realize all functions, and the cost is further reduced.

The present invention discloses a simplified bidirectional quantum time synchronization reference clock station device, system, and method. The system includes a reference clock station device and a station device to be synchronized. The reference clock station device includes: a frequency-entangled two-photon source, a first beam splitter, a first circulator, a first polarization beam splitter, a polarization beam combiner, a first single-photon detector, a first event timer, and a reference clock; the station device to be synchronized includes a second circulator, a third circulator, a fiber Faraday rotator, a second polarization beam splitter, a second single-photon detector, a second event timer, a clock to be synchronized, and a data processing terminal. The present invention uses the same entangled two-photon source as the quantum light source to avoid the impact of low frequency consistency of two frequency-entangled two-photon sources on synchronization accuracy in existing solutions. Reducing the number of single-photon detectors also reduces the impact of inherent detector jitter on synchronization error, thereby further improving the accuracy of quantum time synchronization.