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73 results about "Quantum measurement" patented technology
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Quantum light measurements measure the amount of photosynthetically active radiation, or PAR, which is the light between 400 and 700 nanometers (nm). The light within this range is most effective for photosynthesis, which is why we use units that quantify the light used for plant growth and not the human eye.
Time-resolved single-photon counting two-dimensional imaging system and method
ActiveCN102510282AResolve SensitivitySolve the small size of the arrayPulse techniqueDigital micro mirror deviceData acquisition
The invention provides a time-resolved single-photon counting two-dimensional imaging system and a time-resolved single-photon counting two-dimensional imaging method and belongs to the technical field of extremely-weak light detection. A trigger 2 is triggered to start sampling, centralized sampling is performed at t time intervals, and measurement and counting are performed if light comes at the intervals, so that time resolving of an extremely-weak light object is realized, and a time sequence image is generated. Imaging is performed on the basis of a compressive sensing (CS) theory, a digital micro-mirror device (DMD5) performs linear random projection on a compressible two-dimensional image, the compressible two-dimensional image is optically modulated and then synchronously detected by using a single-photon counter, and a high-resolution extremely-weak light image can be reconstructed by a small amount of sampling operation. The measurement process is linear and non-adaptive, the reconstruction process is non-linear, and the invention has the advantages of high generality, robustness, expandability, superposition and computation asymmetry, and can be widely applied to the fields of life science, medical imaging, data acquisition, communication, astronomy, military affairs, hyper-spectral imaging and quantum measurement.
Owner:NAT SPACE SCI CENT CAS
Total probability arbitrary multiparty JRSP method
InactiveCN103618695AMethod securityGood practical valueKey distribution for secure communicationQuantum entanglementQuantum gate
The invention provides a total probability arbitrary multiparty JRSP method. According to the method, a core sender constructs a real part measurement base in accordance with real part information of quantum states needing to be prepared, particles owned by the core sender are measured, and measuring results are sent to corresponding auxiliary senders and receivers through classical channels; all the auxiliary senders construct imaginary part measurement bases by the adoption of the measuring results and owned imaginary part information, particles owned by the auxiliary senders are measured respectively, and measuring results are sent to the receivers through classical channels; at last, the receivers conduct certain unitary operation on the particles in hands according to the measuring results of the core sender and the measuring results of all the auxiliary senders, and the particles needing to be prepared are obtained. By means of the total probability arbitrary multiparty JRSP method, the methods of quantum information fragmentation, quantum entanglement and quantum measurement are used, arbitrary multiparty JRSP is achieved, and the method is safe and reliable, flexible and universal, and good in practical value.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Quantum computation
ActiveUS7184555B2Improved quantum computationQuantum computersKey distribution for secure communicationFree stateQuantum computer
The invention includes systems for and methods of performing quantum computation. The method of quantum computation includes preparing a set of one or more qubits capable of storing quantum information in 2n possible states, wherein the number of qubits n≧1. The qubit set is subject to a decoherence mechanism that could cause a loss of quantum information stored in some but not all of the qubit states. The method also includes determining, via a quantum measurement of the qubit system or just by analyzing the decoherence of the qubit states, which of the 2n states or their superposition is / are not susceptible to decoherence. The method further includes encoding and processing quantum information in one or more of the decoherence-free states by controlling qubit-qubit interactions or via an electromagnetic interaction with the set of qubits.
Owner:MAGIQ TECH INC
Scalable low-latency feedback control device for quantum bits
ActiveCN109217939AEnabling Quantum MeasurementsImplement Feedback ControlPhotonic quantum communicationDigital signal processingFeedback control
The invention discloses a scalable low-latency feedback control device for quantum bits. The device realizes the feedback control of the quantum states of multiple quantum bits by means of digital signal processing technology and a quantum mechanical principle based on a high-speed microwave baseband signal transceiving hardware circuit board. The quantum feedback control device designed in the present invention is different from the feedback control applied in the classic field, and can generate synchronous microwave pulses for operating superconducting quantum bits, can accurately define thenumber of times, the time and the strength of quantum measurement, demodulates measurement signals in real time, deploys a quantum feedback algorithm on an FPGA, and has extremely low feedback delayand excellent scalability so as to accurately control a system integrating multiple quantum bits and to satisfy a requirement for running a measurement-based quantum error correction algorithm on a quantum chip.
Owner:ZHEJIANG UNIV
Method and apparauts for quantum measurement via mode matched photon conversion
ActiveUS20180149476A1Increase heightImprove system performanceOptical rangefindersNanoopticsNonlinear opticsCovert communication
The present disclosure relates to a generally-applicable measurement technique based on coherent quantum enhancement effects and provides embodiments with nonlinear optics. The technique utilizes parametric nonlinear processes where the information-carrying electromagnetic quanta in a number of electromagnetic modes are converted phase coherently to signature quanta in a single mode or a few modes. The phase coherence means that while the quanta before conversion may have unequal or uncertain phase values across the modes, the signature quanta converted from those different modes have the (near) uniform phase. This can lead to significant increase in the signal to noise ratio in detecting weak signal buried in strong background noise. Applications can be found in remote sensing, ranging, biological imaging, field imaging, target detection and identification, covert communications, and other fields that can benefit from improved signal to noise ratios by using the phase coherent effect.
Owner:STEVENS INSTITUTE OF TECHNOLOGY
RNA secondary structure prediction method for quantum genetic algorithm based on multi-population assistance
The invention belongs to the technical field of bioinformatics and discloses an RNA secondary structure prediction method for a quantum genetic algorithm based on multi-population assistance. According to the method, a stem pool and a stem compatibility matrix of an RNA sequence is established according to the RNA sequence; quantum bit vectors are used to initialize multiple chromosome populations; quantum measurement is performed on each population; optimal individuals are acquired according to measurement results; the optimal individual b in all the populations is obtained and used to replace worst individuals, nonhomologous to b, among the optimal individuals in other populations, then all the populations are updated by use of different rotational angles, and other populations not participating in replacement are updated by use of a fixed rotational angle; and the process is iterated till a stop condition is met. Through the method, the global search capability and search efficiencyof the quantum genetic algorithm are effectively improved, and the evolution algebra of the genetic algorithm is lowered. Meanwhile, all the populations suppress competition and cooperate mutually, so that the globality of the algorithm is improved, and prediction accuracy is substantially enhanced.
Owner:XIDIAN UNIV
Inter-satellite ranging method based on quantum light sources on satellites and reflector
ActiveCN103941263AHigh measurement accuracyHigh signal transmission securityElectromagnetic wave reradiationSurvivabilityArrival time
The invention provides an inter-satellite ranging method based on quantum light sources on satellites and a reflector. The quantum light sources on the satellites and a quantum measuring device are arranged on a user satellite and used for generating and emitting entangled-state photon pulse signals, the reflector and a pointing mechanism are arranged on a beacon satellite and used for reflecting the received entangled-state photon pulse signals to the user satellite, and the user satellite measures the high-precision distance between the user satellite and the beacon satellite by measuring the difference of arrival times of the emitted entangled-state photon pulse signals and the reflected entangled-state photon pulse signals. By means of the method, constellation satellite autonomous navigation tasks based on measurement of inter-satellite distances can be achieved, the degree of dependence of the satellites on the ground measurement and control can be reduced, and the autonomous viability of a constellation system under emergency conditions can be enhanced.
Owner:BEIJING INST OF CONTROL ENG
High-precision magnetic field meter based on novel weak quantum measurement
InactiveCN106483478ALow stability requirementsStable and reliableMagnetic field measurement using magneto-optic devicesPhase differenceWeak measurement
The invention discloses a high-precision magnetic field meter based on novel weak quantum measurement. The magnetic field meter comprises an LED white light source, an initial state preparing system, a magnetic light coupling system and a detection system; the LED white light source generates wide-spectrum photons which interact with a magnetic field; the initial state preparing system collimates the wide-spectrum photons generated by the LED light source, and prepares a polarization state of the wide-spectrum photons into a needed quantum state; the magnetic light coupling system couples the wide-spectrum photons prepared into the quantum state with the magnetic field, and then output the coupled photons; the detection system converts a circular polarization state of the wide-spectrum photons into a linear polarization state, introduces a stable offset bias phase difference between horizontal and vertical polarization in the linearly polarization state, and sets a working point of the system in a most sensitive area; polarization-state projection is carried out to implement post selection of the wide-spectrum photons, and the spectral distribution of the wide-spectrum photons after post selection is measured; and change of the magnetic field intensity where a magneto-optic coupling system is placed is measured by comparing change of the spectral distribution. According to schemes of the invention, the specific bias phase difference is used to change the working point of traditional weak measurement, and the measuring precision is improved greatly. Compared with a superconductive quantum interference magnetic field meter, similar resolution can be reached needless of a low-temperature device or an interference device, the cost is low, and the working state is stable.
Owner:UNIV OF SCI & TECH OF CHINA
Two-party quantum private comparison method based on five-quantum bit entangled state
ActiveCN105871544AAvoid consumptionEnsure safetyKey distribution for secure communicationUser identity/authority verificationThird partyQuantum technology
The invention discloses a two-party quantum private comparison method based on a five-quantum bit entangled state. The two-party quantum private comparison method is used for comparing whether secrets of two users are equal or not in size. The two-party quantum private comparison method has the advantages that the method needs help of a semi-loyal third party (Third Party, TP), the TP is allowed to mistakenly act according to the wish of the TP, but is not allowed to conspire with any one of the two users; one five-quantum bit entangled state can be used for achieving two-bit equality comparison in all comparison; unitary operation and the quantum entanglement swapping technology are not required in the method, it is avoided that expensive quantum devices related by unitary operation and the quantum entanglement swapping technology are consumed; Bell measurement and single-particle measurement are only adopted in the method, and the quantum measurement can be achieved with the existing quantum technology; safety performance according to outside attack and participant attack is guaranteed; secret information and the comparative result of the two users are not revealed to the TP.
Owner:浙江康奥思信息技术有限公司
Method for generating two-photon radiation on basis of single quantum dot
ActiveCN106290287ARadiant realizationEfficient radiationFluorescence/phosphorescencePolystyreneEvaporation
The invention belongs to the field of quantum information, in particular to a method for generating two-photon radiation on the basis of a single quantum dot. Generation of two photons has great significance in the quantum information field such as quantum key distribution, quantum entanglement, quantum measurement and the like. The method for generating two-photon radiation on the basis of the single quantum dot is provided and comprises steps as follows: firstly, a near infrared single quantum dot is prepared on a slide with a indium tin oxide film formed through evaporation plating; then, indium tin oxide nanoparticles cover the single quantum dot; the indium tin oxide nanoparticles are spin-coated with polystyrene polymer films, and influence of the external environment on the quantum dot is effectively isolated; laser co-focusing is performed on the sample, and two-photon fluorescence radiation is generated for the single quantum dot. With the adoption of the indium tin oxide nanoparticles, nonradiative auger recombination of biexciton of the quantum dot is effectively inhibited, and two-photon radiation of the single quantum dot is realized.
Owner:SHANXI UNIV
Laser phase noise measurer
InactiveCN1866037AAvoid stabilityEasy to operateNoise figure or signal-to-noise ratio measurementElectrical testingBeam splittingPrism
The disclosed testing device for laser phase noise comprises: a phase noise conversion device with two polarization beam-splitting lens (1) and (3), and an atom gas chamber or molecule gas chamber (2). Wherein, coupling two beam linear polarization light by (1) to spread into (2), converting the phase noise into amplitude noise by electromagnetic induced coherence effect, using (3) to divide the detecting light and coupling light, and using a balance zero-beat system to detect the outgoing noise. This invention simplifies device fit to mobile and wide application.
Owner:SHANXI UNIV
Polarization multiplexing bidirectional quantum key distribution method and system
ActiveCN110620655AHigh communication rateIncrease profitKey distribution for secure communicationPolarisation multiplex systemsCommunications systemMultiplexer
The invention discloses a polarization multiplexing bidirectional quantum key distribution method. The method is suitable for a quantum communication system of non-polarization coding, an informationsending end of forward communication is defined as Alice, an information receiving end of forward communication is defined as Bob, Bob sends Alice and receives Alice as reverse communication, and in the method, two orthogonal polarizations are used for representing a carrier during forward communication and a carrier during reverse communication respectively. The invention further discloses a polarization multiplexing bidirectional quantum key distribution system. The Alice quantum emission device and the Alice quantum measurement device are respectively connected to a port 1 and a port 4 of the first polarization beam splitter PBS1; the Bob quantum emission device and the Bob quantum measurement device are respectively connected to a port 3 and a port 2 of the second polarization beam splitter PBS2; a port 2 of the first polarization beam splitter PBS1 and a port 1 of the second polarization beam splitter PBS2 are connected through an optical fiber channel. The system uses two orthogonal polarizations to represent a carrier during forward communication and a carrier during reverse communication respectively. Compared with an existing scheme using a circulator and a wavelength division multiplexer, the quantum communication rate is higher.
Owner:QUANTUMCTEK
Null information leakage quantum dialogue protocol with collective retreat phase noise resistance
The invention provides a null information leakage quantum dialogue protocol with collective retreat phase noise resistance. According to the protocol, logical quantum bit with noise interference invariance resistance of a decoherence-free subspace is utilized for eliminating noise effect, and two legal users secretly share initial state of each logic quantum bit by directly transferring corresponding auxiliary logic quantum bit to overcome the problem of information leakage. In the protocol of the invention, secret information is encoded in the initial logic quantum bit by two composite unitary operation. In addition, decoding only needs single-photon measurement rather than Bell state measurement or complex measurement so that the protocol is easy to execute. Security analysis shows that a plurality of active attacks of Eve can be effectively overcome, such as interception-retransmission attack, measurement-retransmission attack, entanglement-measurement attack and control non-operating attack. In addition, compared with anti-noise quantum dialogue protocols of Yang and Hwang, the null information leakage quantum dialogue protocol has better performance on quantum resource and quantum measurement.
Owner:嘉兴智旭信息科技有限公司
Cascadable quantum time synchronization method
ActiveCN111698038AIncrease application distanceTime synchronizationTime-division multiplexPhotonic quantum communicationTelecommunicationsPhoton
The invention provides a cascading quantum time synchronization method. The method comprises the steps of: arranging a plurality of cascading stations in front of two stations needing time synchronization to form a cascading system, wherein the distance between every two adjacent stations does not exceed the action distance of quantum time synchronization; arranging a quantum light source and a quantum measurement device on each station to obtain photon arrival time between adjacent stations; based on a bidirectional time synchronization principle and a cross-correlation algorithm between frequency entangled two photons, calculating to obtain a clock difference between time frequency sources at the two ends of the cascade system by utilizing a photon arrival time sequence recorded by eachstation; and finally, adjusting the output time of the to-be-synchronized end by utilizing the measured clock error to realize time synchronization of the to-be-synchronized end and the source end. Onthe basis of fully utilizing the advantages of high accuracy and high stability of quantum time synchronization, the application distance of the quantum time synchronization is greatly expanded, so that the high-precision quantum time synchronization technology further meets the requirements of long-distance and high-precision time synchronization and transmission.
Owner:NAT TIME SERVICE CENT CHINESE ACAD OF SCI
Threshold straight line determination method and device based on measurement track
ActiveCN110210067AMeet the amplitude rateReduce mistakesQuantum computersDesign optimisation/simulationOriginal dataQuantum computer
The invention belongs to the field of quantum measurement and control, and specifically discloses a threshold straight line determination method and device based on a measurement track. The thresholdstraight line determination method comprises the following steps: obtaining measurement data of a quantum bit reading signal when a quantum bit is in a determined quantum state, and carrying out complex number transformation processing on the measurement data to obtain original data corresponding to the quantum bit reading signal when the quantum bit is in the determined quantum state; obtaining ameasurement track corresponding to the quantum bit reading signal according to the original data; obtaining a first type of coordinate point data, a first statistical center coordinate point, a second type of coordinate point data and a second statistical center coordinate point according to the measurement track; and determining a threshold straight line according to the first type of coordinatepoint data, the first statistical center coordinate point, the second type of coordinate point data and the second statistical center coordinate point. The threshold straight line determination method can improve the data preprocessing precision and the obtained threshold linear precision, and can improve the reliability and the stability of the quantum computing system.
Owner:HEFEI ORIGIN QUANTUM COMP TECH CO LTD
Method and system for optimizing goods loading three-dimensional layout based on quantum genetic algorithm
ActiveCN103473464AIncrease diversityAccurate 3D layout optimization resultsSpecial data processing applicationsGenetic populationLogistics management
The invention discloses a method and a system for optimizing a goods loading three-dimensional layout based on a quantum genetic algorithm and belongs to an intelligent loading optimizing method. The method mainly comprises the following nine steps: inputting information about counters and packing boxes, initiating, calculating suitability, mutating, crossing, measuring quanta, optimally retaining, selecting a wheel disc, judging terminal conditions and outputting an optimizing result. The variety of genetic population genes is effectively increased through the combination of quantum calculation and the genetic algorithm, and the maintenance capacity and the overall optimizing capacity of the system are accordingly improved, so that a more accurately optimizing result about the goods three-dimensional layout is obtained. Meanwhile, the operation steps of the method provided by the invention for optimizing the goods loading three-dimensional layout based on the quantum genetic algorithm are clearer than those of the traditional algorithm. The method and the system can be used for electronic fine management over all kinds of warehouse logistics industries and can be applied in a wide range.
Owner:SICHUAN AEROSPACE SYST ENG INST
A quantum control remote joint implementation method
InactiveCN109714156AHigh feasibilityImprove securityKey distribution for secure communicationQuantum entanglementJoint Implementation
The invention discloses a quantum control remote joint implementation method, which belongs to the field of quantum, and is characterized in that three senders share quantum control information needing to be executed, and remote quantum control is completed in a joint assistance manner. The method of the invention adopts an easy-prepared, anti-noise five-particle entangled state as a quantum entangled channel to realize joint control of quantum states; a sender selects to execute corresponding single event measurement according to known remote quantum control information needing to be executedand measurement results of other communication parties, and a receiver executes local unitary operation on other particles according to measurement results of all the senders, so that a target statecan be prepared on the other particles. According to the invention, quantum communication and quantum measurement technologies are utilized to realize quantum state remote joint control. The method has the advantages of high feasibility and high safety.
Owner:GUANGXI UNIV FOR NATITIES
Quantum dialogue protocol with collective-dephasing noise resisting robustness based on logic qubits and CNOT operation
ActiveCN104468529AAvoid risk of leakageHigh Information Theoretic EfficiencyKey distribution for secure communicationQuantum secure direct communicationPhase noise
The invention provides a quantum dialogue protocol with collective-dephasing noise resisting robustness based on logic qubits and CNOT operation. A preparation party produces the logic qubits serving as a transmission state to resist collective-dephasing noise. The other party knows the initial preparation state of the logic qubits by the aid of the CNOT operation and acquires secret information of the preparation party through decoding with the help of a classic information sequence transmitted by the preparation party. The preparation party reads secret information of the other party by the aid of quantum secure direct communication. In this way, the risk of information leakage is effectively avoided. In the protocol, only single-photon measurement is required for quantum measurement. Compared with a noise-resistant quantum dialogue protocol in the past, the protocol has the highest information theory efficiency. Compared with the recent quantum dialogue protocol that two adjacent logic qubits need to be prepared to be in the same quantum state, the protocol is easier to execute experimentally because the protocol does not have the special request.
Owner:重庆市正清药品包装有限公司
Acquisition method of threshold line for confirming quantum bit quantum state
ActiveCN111860550AImprove fidelityImage analysisCharacter and pattern recognitionSignal onParticle physics
The invention discloses an acquisition method of a threshold line for confirming a quantum bit quantum state, and relates to the field of quantum measurement and control. The acquisition method includes the steps: preparing the quantum bits into a first quantum state and a second quantum state, and repeatedly measuring the first quantum state and the second quantum state respectively to obtain coordinate point data of a plurality of quantum bit reading signals on an orthogonal plane coordinate system; respectively marking as a first set and a second set, respectively carrying out Gaussian fitting on the coordinate points of the first set and the second set to obtain a first statistical center coordinate point and a second statistical center coordinate point of the Gaussian fitting graph respectively corresponding to the first set and the second set, and respectively corresponding to a first standard deviation and a second standard deviation; respectively determining a first probabilitydensity distribution function in the first set and a second probability density distribution function in the second set; and determining a fidelity function, and determining a corresponding thresholdline as an optimal threshold line when the fidelity function takes the maximum value. The threshold line established according to the acquisition method provided by the invention can provide more accurate reference for the judgment of unknown quantum states.
Owner:ORIGIN QUANTUM COMPUTING TECH (HEFEI) CO LTD
Method and device for measuring small optical transverse displacement based on laser high-order transverse mode
InactiveCN103791845AHigh measurement sensitivityCompact structureUsing optical meansLight beamOptoelectronics
The invention relates to measuring methods and devices in the field of laser precise measurement and quantum measurement, in particular to a method and device for measuring small optical transverse displacement based on a laser high-order transverse mode. The method for measuring the small optical transverse displacement based on the laser high-order transverse mode comprises the following steps that (a) an Hermite-Gaussian laser with an n-order mode and an Hermite-Gaussian laser with an n+1-order mode are used as signal light and local light respectively, wherein n is greater than or equal to 1; (b) the signal light is made to generate a horizontal movement quantity d; (c) the local light and the signal light which is moved horizontally, namely the light to be measured, are respectively divided into two light beams with the same intensity; (d) intensity signals of two new laser beams are collected respectively, electric signals obtained after subtraction are converted into corresponding power signals, the value of d can be obtained, and then information of an object to be measured can be deduced. By means of the method and device for measuring the small optical transverse displacement based on the laser high-order transverse mode, measuring sensitivity is high and can reach or exceed the sensitivity of measurement conducted through a one-order squeezed-state light field; besides, the device is simple and easy to control.
Owner:SHANXI UNIV
Quantum bit frequency calibration method based on Ramsey interference experiment
ActiveCN109406875AGuaranteed calibration valueReduce experimental errorFrequency measurement arrangementOrthogonal coordinatesLine fitting
The present invention belongs to the technical field of quantum measurement and control, and especially relates to a quantum bit frequency calibration method based on a Ramsey interference experiment.The method comprises the steps of: performing N-times Ramsey interference experiment for quantum bits, recording f0(f<N>d) obtained according to a result of each Ramsey interference experiment, and performing liner fitting of coordinate points formed by N f<N>d and the corresponding f0(f<N>d) in an orthogonal plane coordinate system to obtain a fitting linear equation; and according to the fitting linear equation, obtaining a fd value. The quantum bit frequency calibration method can effectively ensure the precision of the finally obtained quantum bit frequency calibration value by means of the Ramsey interference experiment and the data fitting.
Owner:HEFEI ORIGIN QUANTUM COMP TECH CO LTD
Quantum resource limited semi-quantum secret sharing method
ActiveCN108173656ASimplify Quantum CapabilitiesReduce communication costsKey distribution for secure communicationComputer networkMeasurement device
The invention discloses a quantum resource limited semi-quantum secret sharing method. Semi-quantum secret sharing usually includes that a quantum side Alice divides a secret into two parts and sendsthem to quantum resource limited Bob and Charlie respectively, and only when the Bob and the Charlie cooperate, the complete secret be recovered. At present, the typical semi-quantum secret sharing method guarantees the security, but requires the semi-quantum sides Bob and Charlie to perform quantum measurement operations. The measurement device may be unsafe, which increases the hidden danger ofsecret sharing. The present invention enables the resource limited Bob and Charlie to perform secret sharing without a quantum measurement device, and the quantum side Alice does not require quantum memory. In this way, the present invention can greatly reduce the quantum resources required by the three participants, thereby saving the communication cost.
Owner:XIANGTAN UNIV
Method and system for optical spectroscopy
ActiveUS8860939B2Reduce disadvantagesOptical measurementsRadiation pyrometryQuantum-optical spectroscopyComputer module
Owner:MCGILL UNIV
Bright squeezed light field producing device
Owner:HEFEI UNIV OF TECH
Secondary optical lens design method based on quantum measurement and uneven irradiation
ActiveCN106641793APhoton illuminance specific non-uniformity accurateExact non-uniformitySemiconductor devices for light sourcesRefractorsIlluminanceFree form
The invention discloses a secondary optical lens design method based on quantum measurement. The uneven photon irradiance requirement is met. The method comprises steps as follows: a light source and an irradiated surface are divided into grids, the correspondence between the light source and the irradiated surface is found out, a free-form surface normal vector is calculated, a free-form surface is constructed in the normal vector direction and is filled to form a lens, the lens is substituted into optical simulation software for simulation calculation, if the unevenness of the photon irradiance of the irradiated surface cannot meet the requirement, the steps are repeated, and grid parameters are modified until the uneven photon irradiance of the irradiated surface meets the requirement.
Owner:INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
Quantum state discrimination model obtaining method and device
ActiveCN111353607AAccurate descriptionOvercoming the Descriptive DeficienciesQuantum computersDiscriminant modelParticle physics
The invention belongs to the field of quantum measurement and control, and particularly relates to a method and device for obtaining a quantum state discrimination model, and the method comprises thesteps: obtaining first measurement data and second measurement data which are respectively corresponding to a quantum bit in a first quantum state and a second quantum state; processing the first measurement data and the second measurement data based on a two-dimensional Gaussian mixture model to obtain first quantum state label data and second quantum state label data which reflect the real distribution characteristics of the first quantum state and the second quantum state respectively; and training the first quantum state label data and the second quantum state label data to obtain a discrimination model for discriminating a quantum state type. According to the invention, the accuracy of the obtained discrimination model and the accuracy of the quantum state judgment result can be improved.
Owner:HEFEI ORIGIN QUANTUM COMP TECH CO LTD
Polarization system of diamond color center nucleuses
ActiveCN108415064AIncrease reaction rateReduce interactionParticle polarisation measurementDiamond colorData acquisition
The invention discloses the polarization system of diamond color center nucleuses. The system comprises an optical control system, a microwave control system, a magnetic field control system and a control and data acquisition system. The optical control system, the microwave control system and the magnetic field control system are independent and are connected through the control and data acquisition system and a correlation component so as to form a diamond color center nucleus polarization system. Through the method of using a laser, a microwave, a magnetic field and a radio-frequency multi-physics field to act on a diamond according to a design sequence, interaction between a diamond color center and surrounding nucleuses can be high-sensitively and rapidly reduced, the high polarization efficiency of the nucleuses can be realized, de-coherence time used for quantum measurement can be prolonged, and support is provided for the technologies of quantum calculating, quantum sensing, quantum transmission and the like based on the diamond color center.
Owner:BEIHANG UNIV
Method and System for Optical Spectroscopy
ActiveUS20130335735A1Reduce disadvantagesOptical measurementsRadiation pyrometryFtir spectraBlack box
Two dimensional (2D) optical spectroscopy, wherein the spectrum has an excitation and an emission axis, reveals information formerly hidden in one-dimensional (1D) optical spectroscopy. However, current two dimensional optical spectroscopy systems are complex laboratory arrangements and accordingly limited in deployment. According to embodiments of the invention a monolithic platform providing significantly reduced complexity and increased robustness is provided allowing for “black-box” modules allowing commercial deployment of 2D optical spectroscopy instruments. Additionally, the invention supports high pulse repetition rates as well as one quantum and two quantum measurements under electronic control.
Owner:MCGILL UNIV
Beam forming codebook search method based on quantum tabu search algorithm
ActiveCN110572194AReduce complexityEasy to detectSpatial transmit diversityLocal optimumCyclic process
The invention discloses a beam forming codebook search method based on a quantum tabu search algorithm, which comprises the following steps of: setting a quantum matrix Q (t) required by the quantum tabu search algorithm according to two codebooks P and C in which an analog precoder and a combiner are respectively stored, and initializing the quantum matrix Q (t); obtaining an adjacent solution set N through quantum measurement, performing trimming operation on each solution exceeding the range in the set, and calculating a target function value corresponding to each solution; detecting whether the algorithm is caught in the local optimal solution or not in the cyclic process, and jumping out of the local optimal solution for the algorithm caught in the local optimal solution by applying quantum NOT gate X operation; and determining an optimal solution sb and a worst solution sw in the adjacent solution set N, and applying a quantum revolving door R (delta theta) to different positionsbetween the two matrixes. By adopting the quantum tabu search algorithm and the quantum NOT gate operation, the complexity of the traditional codebook-based beam forming method for searching the optimal pairing problem of the precoder and the combiner is reduced, and the algorithm falling into the local optimal solution jumps out of the local optimal solution.
Owner:SOUTHEAST UNIV
Information recording method using superconduction having bands, calculating method, information transmitting method, energy storing method, magnetic flux measuring method, and quantum bit construction method
InactiveUS20050107262A1Reduce energy lossPractical applicationQuantum computersSuperconductive properties measurementsInformation transmissionPhase difference
A recording method that records information in soliton units, a computing method that performs a computation, an information transmission method, an energy storage method, a magnetic flux measurement method and a quantum bit constitution method utilize the properties of phase solitons manifested between superconducting order parameters present in multiple bands in a superconductor having a multiple bands. The phase difference soliton is maintained, so information can be stored in the form of phase differences. Moreover, −Θsoliton phase slip will also be present when the same energy is carried in the reverse direction, so the soliton itself can have a + or − sign. The soliton enables storage of energy not accompanied by magnetic flux. Also, with soliton units, magnetic flux can be measured with greater precision by discriminating external magnetic flux. Moreover, using solitons and anti-solitons makes it possible to constitute quantum bits required in quantum measurements.
Owner:NAT INST OF ADVANCED IND SCI & TECH
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