9 results about "Quantum detector" patented technology

The invention belongs to the technical field of commercial cipher system testing, and particularly relates to a quantum random number generator-based commercial cipher system entropy source quality detection method, which comprises the following steps of: acquiring shot noise of a light quantum detector at a high sampling rate, removing direct current bias by using a moving average subtraction method, and acquiring a quantum fluctuation sequence of a zero mean value; based on a variance ratio of the sequence and short-range autocorrelation, nonlinear mapping of an exponential function is utilized to obtain correlation degree so as to amplify a weak non-quantum memory effect; obtaining an evaluation model containing hyperbolic cosine and a logarithmic function by combining the drift potential energy of the bias voltage relative to the target value and the aging time of the device, and obtaining a dynamic entropy loss index; and comparing the entropy loss index with a preset threshold value, and executing self-adaptive bias current feedback regulation or triggering hardware fusing according to a comparison result. According to the invention, the problem of recessive degradation of the entropy source caused by drifting of the working point of the detector is solved, and accurate closed-loop control of the quality of the entropy source is realized.

The present application belongs to the technical field of commercial cipher system test, and particularly relates to a method for detecting the quality of an entropy source of a commercial cipher system based on a quantum random number generator, which comprises: obtaining shot noise of an optical quantum detector at a high sampling rate, removing direct current bias by using sliding average subtraction, and obtaining a quantum fluctuation sequence with zero mean; obtaining a correlation degree by using nonlinear mapping of an exponential function based on the variance ratio and short-range autocorrelation of the sequence, so as to amplify weak non-quantum memory effects; obtaining an evaluation model containing a hyperbolic cosine and a logarithmic function by combining the drift potential of a bias voltage relative to a target value and the aging time of a device, so as to obtain a dynamic entropy loss index; and comparing the entropy loss index with a preset threshold value, and performing adaptive bias current feedback adjustment or triggering hardware fusing according to the comparison result. The present application solves the problem of implicit degradation of an entropy source caused by drift of a detector operating point, and realizes precise closed-loop control of the quality of the entropy source.

An entanglement-assisted multistatic quantum radar detection technique employs the integrated entangled source shared among multiple transmitters and performing transmit side optical phase conjugation. EA receivers are based on classical homodyne detection schemes. The EA multistatic radar detection technique is evaluated against bistatic radar EA detection scheme and various coherent states-based quantum detection schemes (the optimum quantum detector. Helstrom threshold detector, and random phase optimum quantum detector). The EA multistatic target detection probability is significantly better than that of corresponding bistatic radar EA detection techniques. coherent states-based quantum detection techniques. and the classical radar detection schemes. When both scattered signal photon channels and idler channels are noisy and lossy, the scheme significantly outperforms the EA bistatic radar scheme.

A detector can include a group of orthogonally oriented quantum detectors, wherein each quantum detector among the group of orthogonally oriented quantum detectors can detect variations in a quantum field. The detector can further include a signal processor that can determine a direction and magnitude of the detected quantum field variations based on outputs from the group of orthogonally oriented quantum detectors. Each quantum detector among the group of orthogonally oriented quantum detectors can include an array of Zener diodes biased to produce shot noise modulated by quantum field variations. The detector can constitute a three-dimensional quantum field detector. In some embodiments, a tunneling sensor comprising a tunneling capacitor may be implemented in place of Zener diode.

The present application relates to the technical field of water quality pollution detection, and particularly relates to a water quality pollution rapid detection method driven by quantum sensing technology. The present application deploys a quantum sensor array in a water area to be detected to collect quantum signal response data of the water area; a pollutant quantum recognition model is constructed, the quantum signal response data is input into the model to obtain an initial prediction value of pollutant concentration; initial detection parameters of a quantum detector are generated based on the initial prediction value, the detector performs initial pollution detection according to the parameters, and first deviation data of actual detection values and expected detection values is collected; the detection error is determined according to the deviation data, and then the initial detection parameters are corrected to generate optimized detection parameters; finally, the detector performs secondary pollution detection based on the optimized detection parameters. The method can quickly and accurately complete water quality pollution detection without complex water sample pretreatment, is suitable for different water area detection requirements, and improves detection efficiency and accuracy.

A quantum detector is provided with a vertically stacked structure. The detector comprises a conductive substrate, a plurality of quantum detectors configured on the conductive substrate, and a lower electrode. Each of the quantum detectors comprises an electron transport layer (GaAs), a three-dimensional topological insulator layer (Sb-doping Bi2Te3), a light-absorbing layer (e.g. having excellent graphene quantum dot (ZnO)), and an upper electrode. The lower electrode is disposed between first and second upper electrodes of the first and second quantum detectors that are adjacent to each other to provide a vertical series of electrical coupling. Thus, the present invention provides a novel photodetector with a vertical structure. With the preparation of a topological material through high-power impulsed magnetron sputtering (having a special surface state of an extremely-low energy gap), the mobility of electron-hole-pair carriers is effectively improved. The whole device achieves low energy consumption and extended use life.

The invention discloses a photon detector based on quantum communication, and relates to the technical field of quantum photon imaging, and the photon detector comprises a quantum communication integration box, the outer surface of the quantum communication integration box is provided with a power-on module, the upper surface of the quantum communication integration box is symmetrically provided with communication modules, and the two sides of the quantum communication integration box are respectively provided with a heat dissipation groove. A first heat dissipation module and a second heat dissipation module are arranged in the quantum communication integration box, and a heat exchange module is installed on the side, close to the first heat dissipation module, of the inner wall of the quantum communication integration box. The three problems of temperature measurement precision, sealing reliability and maintenance efficiency of the quantum detector are solved, the comprehensive performance breakthrough of high stability, low noise, long service life and easy maintenance is realized, and a key technical support is provided for engineering application of a quantum communication system.

Systems, methods, and computer program products for characterizing photons are described. A signal from a superconducting nanowire single photon detector (SNSPD) is transmitted to a converter configured, based on the signal, to output data at a sampling rate. The data from the converter is transmitted to a computing node configured to infer one or more attributes of the at least one photon from the data.

The invention relates to the technical field of quantum nondestructive sensing, and provides a quantum detector which comprises a sensor, a magnetizer, a laser module, a microwave module, a second photodiode, a second filter and a data processing module. On the basis of the difference noise reduction principle of exciting light and photoinduced fluorescence, structural treatment is carried out around a small section of optical fiber connected with the diamond NV color center, and through the structural design of the tapered optical fiber, part of exciting light is converted by a photodiode in a short distance in the form of spatial light; and meanwhile, efficient acquisition of differential excitation light is realized through the design of a miniaturized and spatial light type light acquisition structural member, and development and application of an integrated and miniaturized sensor are promoted at the same time.