61 results about "Quantum detection" patented technology

The invention relates to a method of fabricating an optical device for analysing a scene, comprising an emitter and a detector in the mid-infrared or far-infrared, characterized in that it comprises:the production of a stack of semiconductor layers grown epitaxially on the surface of a semiconductor substrate, certain layers of which are doped;the production of a first, quantum cascade laser emission device (L) emitting an analysis beam in the mid-infrared or far-infrared, from a first level called the emission level, into the stack of semiconductor layers; andthe production of a second, quantum detector device (D) capable of detecting a beam backscattered by the scene to be analysed, at the same level in the stack as the emission level.

The invention discloses an X-ray flat panel detector and a preparation method thereof as well as a white insulation material. The X-ray flat panel detector comprises a film transistor base plate, an insulation layer, a pixel electrode, a photodiode, an electrode and an X-ray transfer layer, wherein the insulation layer is arranged on the film transistor base plate and has a reflection effect, and is provided with a contact whole exposing a source electrode of the film transistor base plate; the pixel electrode is arranged on the insulation layer, and is conducted with the source electrode of the film transistor base plate via the contact hole; the photodiode covers the pixel electrode; the electrode is arranged on the photodiode; the X-ray transfer layer is arranged on the electrode. The X-ray flat panel detector has high quantum detection efficiency and sensitivity.

Alice generates a sequence of key bits forming an initial cryptographic key. Alice then uses the sequence of key bits and a sequence of cipher bits to control respective control parameters of a quantum encoding process applied to a sequence of quantum pulses, where the sequence of cipher bits used is known to Bob. Alice then releases the encoded pulses towards Bob over a quantum channel. Bob uses the previously agreed-upon sequence of cipher bits to control a control parameter, such as the quantum basis, of a quantum detection process applied to the pulses received from Alice, thus producing a detection outcome for each received pulse. Bob then derives a final cryptographic key from the detection outcomes. Because the cipher bits used to select the quantum bases used by both Alice and Bob are known by both parties, the method allows the final cryptographic key to be distributed with full basis alignment compared to 50% for BB84, thus allowing efficient quantum key distribution over multiple hops.

According to one aspect, the invention relates to an element for quantum photodetection of an incident radiation in a spectral band centred around a central wavelength λ0, having a front surface intended for receiving said radiation, and including: a stack of layers of semiconductor material forming a PN or PIN junction and including at least one layer made of an absorbent semiconductor material having a cut-off wavelength λ0>λ0, the stack of layers of semiconductor material forming a resonant optical cavity; and a structure for coupling the incident radiation with the optical cavity such as to form a resonance at the central wavelength λ0 allowing the absorption of more than 80% in the layer of absorbent semiconductor material at said central wavelength, and an absence of resonance at the radiative wavelength λrad, wherein the radiative wavelength λrad is the wavelength for which, at operating temperature, the radiative recombination rate is the highest.

The invention provides a diamond NV color center fluorescence high-efficiency collection device, belongs to the field of diamond NV color center fluorescence detection, and is expected to be applied to various quantum detection devices such as a diamond NV color center-based quantum computer, a gravity gradiometer, an accelerometer, a thermometer and a single-photon imager. According to the technical scheme, in-phase double collection of red fluorescence and far infrared fluorescence is adopted, and the fluorescence collection proportion is greatly increased; fluorescence excited by a diamondNV color center is reflected by a parabolic reflector, parallel focusing is performed by a Fresnel plane lens, and under the combined action of a shading cylinder, light dissipation is reduced to themaximum extent, and efficient gathering of the fluorescence is realized; the axial helical antenna with high directivity and high gain is adopted to provide high-efficiency microwave excitation, so that high-efficiency optomagnetic resonance is realized, and the intensity of red fluorescence generated by the diamond NV color center is increased.

The invention provides a multi-photon entangled light source comprising a laser. The working material of the laser has parity. The laser comprises an optical resonant cavity. The optical resonant cavity is a parallel plane standing wave cavity. The optical resonant cavity comprises a laser output end and a total reflection end opposite to the laser output end. The laser light in the two-photon entangled state is generated by the excited radiation of the working material in the optical resonant cavity. The laser light in the two-photon entangled stat propagates back and forth in the optical resonant cavity to generate multi-photon entangled laser light. The total reflection end completely reflects the multi-photon entangled laser light incident on the total reflection end so that the macro-scale single entangled state multi-photon entangled laser light is emergent from the laser output end. According to the multi-photon entangled light source, the multi-photon entangled laser light outputted from the laser output end is enabled to have the single entangled state so that the multi-photon entangled laser light can be used in application such as quantum computation, quantum detection,quantum communication and the like without corresponding processing.

An embodiment of the invention provides a novel high-accuracy current transformer suitable for a GIS, belonging to the technical field of precise measurement of current. The GIS comprises at least onecurrent-carrying conductor and a protective shell, and the current transformer comprises multiple quantum sensors, and a quantum detection system, wherein the quantum sensor is used for measuring magnetic field strength around each current-carrying conductor, at least 4n quantum sensors are uniformly distributed on a virtual circle with a central axis of each current-carrying conductor as a center of a circle and preset length as radius, a magnetic shielding layer is arranged at the periphery of each virtual circle, wherein n is a positive integer, and the quantum detection system is connected with each quantum sensor, and is used for acquiring magnetic field strength around the current-carrying conductor through the quantum sensor, and calculating current of each current-carrying conductor according to the magnetic field strength.

Alice generates a sequence of key bits forming an initial cryptographic key. Alice then uses the sequence of key bits and a sequence of cipher bits to control respective control parameters of a quantum encoding process applied to a sequence of quantum pulses, where the sequence of cipher bits used is known to Bob. Alice then releases the encoded pulses towards Bob over a quantum channel. Bob uses the previously agreed-upon sequence of cipher bits to control a control parameter, such as the quantum basis, of a quantum detection process applied to the pulses received from Alice, thus producing a detection outcome for each received pulse. Bob then derives a final cryptographic key from the detection outcomes. Because the cipher bits used to select the quantum bases used by both Alice and Bob are known by both parties, the method allows the final cryptographic key to be distributed with full basis alignment compared to 50% for BB84, thus allowing efficient quantum key distribution over multiple hops.

The invention discloses a quantum detection constant false alarm detection system and method based on an entangled state. The method comprises the following steps: obtaining an entangled two-photon signal; converting a reflection signal and a reference light beam into a first electric pulse signal and a second electric pulse signal; performing coincidence counting on the first electric pulse signal and the second electric pulse signal to obtain a coincidence counting value; obtaining a first coincidence probability according to a first coincidence probability calculation formula; obtaining a mean value of the noise according to the coincidence counting values of all the reference units; obtaining conditional probability density according to the mean value of the noise; and obtaining a judgment threshold value according to the conditional probability density and the equivalent false alarm rate, wherein if the result is that the coincidence count value is larger than the judgment threshold value, the judgment result is that the target exists, and if the result is that the coincidence count value is smaller than the judgment threshold value, the judgment result is that the target does not exist. According to the method, the constant false alarm detection technology is utilized to realize that an entangled state quantum detection system adjusts the judgment threshold according to the false alarm probability under different noise conditions, and constant false alarm detection of a target is completed.

The invention relates to a light quantum detection system, a calculation method thereof and a light quantum multi-phase bidirectional flowmeter employing the system. The light quantum detection systemcomprises an emitter and a detection module, wherein the emitter and the detection module are arranged at two sides of a throttling element, the emitter is a light quantum source and is used for emitting light quantum, the throttling element is used for a fluid to pass through, the emitter and the detection module are arranged at two sides of a throat segment of the throttling element, the detection module is a detector array and comprises a plurality of detection units arranged in a matrix form, each detection unit is used for receiving light quantum penetrating through the throttling element, and the detection units are CZT detectors. The light quantum sub-source is used as the emitter, light quantum particle with different energy is emitted, and each detection unit is used for independently measuring single photon; and with the adoption of the CZT semiconductor detector array, the light quantum detection system is small in volume and higher in energy resolution, the application ofa physical collimator can be omitted, relatively good space resolution is achieved in measurement section, so that the measurement accuracy is improved.

According to one aspect, the invention relates to an element for quantum photodetection of an incident radiation in a spectral band centered around a central wavelength λ0, having a front surface intended for receiving said radiation, and including: a stack of layers of semiconductor material forming a PN or PIN junction and including at least one layer made of an absorbent semiconductor material having a cut-off wavelength λ0>λ0, the stack of layers of semiconductor material forming a resonant optical cavity; and a structure for coupling the incident radiation with the optical cavity such as to form a resonance at the central wavelength λ0 allowing the absorption of more than 80% in the layer of absorbent semiconductor material at said central wavelength, and an absence of resonance at the radiative wavelength λrad, wherein the radiative wavelength λrad is the wavelength for which, at operating temperature, the radiative recombination rate is the highest.

The invention provides a digital intercom system based on quantum encryption. The digital intercom system comprises a communication intercom terminal and a communication exchange gateway, the communication intercom terminal is used for intercom information transmission and comprises an intercom communication module and an encryption and decryption module; the communication exchange gateway comprises a sub-gateway module, a quantum generation module and a quantum key storage module, the sub-gateway module comprises a management module, a quantum key distribution module and a quantum detection module, and the management module is used for managing key application, registration and communication addresses and communication parameters of talkback information transmission in the talkback information transmission process; the quantum generation module is used for generating a quantum key with randomness; the quantum key storage module is used for storing the quantum key generated by the quantum random number generation module; the quantum key distribution module is used for distributing the quantum key to the encryption and decryption module. According to the invention, the security of data transmission is improved, and the complexity of equipment management is reduced.

A diagnosis and treatment system for the natural therapy includes a detection module, a scheme making module, a dredging module, an adjustment module, an acupuncture module, a supplying module, a correcting module, a motion management module, a restoration and regeneration module, and an evaluation module; the detection module can perform constitution identification, meridian-collateral detection, quantum detection and carotid artery blood vessel examination; the scheme making module can make a treatment scheme according to data detected by the detection module; the dredging module can dredge meridians and qi and blood; the adjustment module can adjust qi and blood, yin and yang, acid-base, and five internal organs; the acupuncture module can perform heat simulation and yin and yang meridian adjustment; the supplying module can perform Tai Ji, energy supplying, personalized wall-breaking resuming, and dietary therapy; the correcting module can correct spines; and the motion management module can perform rhythm treatment and motion management. The diagnosis and treatment system can effect a permanent cure according to the pathogenesis of cells of a human body, is not a medicine treatment system, can avoid harmful side-effects, can treat both principal and secondary aspect of diseases, can cure the diseases, can prevent and cure the diseases, can cure various diseases at the same, and is high in efficiency.

The invention provides a downhole-to-ground logging communication and control device. The device has the advantages of being high in detection sensitivity, wide in working temperature range, low in working energy consumption, small in occupied size, large in channel width, high in transmission rate and low in price, and has obvious advantages in the aspect of wireless transmission of downhole-to-ground data communication. The device comprises a ground part and an underground part; the ground part is provided with an atomic magnetometer receiving device and quantum detection equipment for reading out quantum data; the underground part comprises an electromagnetic wave emission system; and the electromagnetic wave emission system is used for encoding signals detected underground and emitting the signals through electromagnetic waves.

The invention relates to a double light path high-efficiency fluorescence collecting system which mainly comprises a slit plate, an IP plate, two optical fiber rows, a light screen, a photomultiplier tube (PMT), a light filter, a support and a logarithmic amplifier. The two ends of the slit plate are fixed on a support platform, and the IP plate is transmitted on the slit plate. The two optical fiber rows are fixed on the slit plate by the fixing support. The back ends of the two optical fiber rows are integrated into one bundle which is fixed by a metal column and is packed into a metal round cover of the photomultiplier tube, and the back end faces of the two optical fiber rows are close to the light screen. The light filter is arranged behind the light screen, the PMT is arranged behind the light filter, the output of the PMT is connected with the logarithmic amplifier, and the PMT metal round cover is fixed on a machine frame through the support. The double light path high-efficiency fluorescence collecting system has the advantages of simplified light path layout, convenient adjustment, reduction in cost and improvement in fluorescence collecting efficiency; the fluorescence collecting efficiency of the invention is more than 50 percent higher than that of the prior structure; the quantum detection efficiency of a CR reading system is improved.

Apparatus for detecting pulse optical position modulated signals with high background noise by detection of quantum arrival rate at the detector are described. Pulse signals at the detection limit are characterized by the arrival of clusters of individual photons at an optical receiver. The receiver has embedded shot noise that interferes with the detection of the signal of interest. The apparatus distinguishes the signal of interest by a measurement of the rate of arrival of the photons of the signal of interest from the ambient shot noise rate of the receiver. The apparatus determines the optimal signal detection criteria and calculates the expected bit error rate of the decoded data.

Apparatus for detecting pulse optical position modulated signals with high background noise by detection of quantum arrival rate at the detector are described. Pulse signals at the detection limit are characterized by the arrival of clusters of individual photons at an optical receiver. The receiver has embedded shot noise that interferes with the detection of the signal of interest. The apparatus distinguishes the signal of interest by a measurement of the rate of arrival of the photons of the signal of interest from the ambient shot noise rate of the receiver. The apparatus determines the optimal signal detection criteria and calculates the expected bit error rate of the decoded data.