115 results about "Quantum optics" patented technology

The disclosed Quantum Optical Coherence Tomography apparatus and method includes a source of quantum entangled photons and a quantum interference device. The pair of entangled photons is divided into two beams, one of which illuminates a semi-reflective object and the second of which is reflected from a variable optical time-delay element (VTE). The VTE is scanned and the quantum interference in the QID is recorded to build up a reflectance profile of the object. A real scanning produces a full tomographic reflectance image. A method of processing the data to eliminate the effects of optical dispersion is disclosed.

A method and apparatus for generating true random numbers by way of a quantum optics process uses a light source to produce a beam which illuminates a detector array. The detectors of the array are associated with random numbers values. Detection of a photon by one of the detectors yields a number whose value is equal to that associated with the detector. This procedure is repeated to produce sequences of true random numbers. The randomness of the numbers stems from the transverse spatial distribution of the detection probability of the photons in the beam. If the array comprises two detectors, the true random numbers produced are binary numbers. The process can be sped up using an array having pairs of two detectors. Using an array having more than two detectors also allows generating true random numbers of dimension higher than two. The primary object of the invention is to allow generating true random numbers by way of a quantum optics process.

The present invention describes nanophotonic materials and devices for both classical and quantum optical signal processing, transmission, amplification, and generation of light, which are based on a set of quantum systems having a discrete energy levels, such as atoms, molecules, or quantum dots, embedded in a frequency bandgap medium, such as artificial photonic crystals (photonic bandgap materials) or natural frequency dispersive media, such as ionic crystals, molecular crystals, or semiconductors, exhibiting a frequency (photonic) bandgap for propagating electromagnetic modes coupled to optical transitions in the quantum systems. If the frequency of one of optical transitions, called the working transition, lies inside the frequency bandgap of the medium, then spontaneous decay of the working transition into propagating photon modes is completely suppressed. Moreover, the excitation of the working transition and a photon form a photon-quantum system bound state lying inside the photonic bandgap of the medium, in which radiation is localized in the vicinity of the quantum system. In a quantum system “wire” or a quantum system “waveguide”, made of spatially disordered quantum systems, or in a chain quantum system waveguide made of a periodically ordered identical quantum systems, wave functions of the photon-quantum system bound states localized on different quantum systems overlap each other and develop a photonic passband lying inside bandgap of the photonic bandgap medium.

The invention relates to a system for producing various vector beams, in particular to a system for producing various vector beams, which has no need of special devices, low cost, high conversion efficiency and easy realization. The system comprises a cat eye cavity laser and a laser interference part, wherein, the cat eye cavity laser is used for outputting various transverse modes, and the structure of the cat eye cavity laser comprises a cat eye reverse device composed of a concave mirror, a convex lens or a lens group to serve as a cavity mirror; the laser interference part is used for producing various vector beams for beams output by the cat eye cavity laser via beam splitting, reflecting, beam rotating, coherent combination and the like. Various vector beams can be produced by adjusting space between the concave mirror and the convex lens or the lens group in the cat eye reverse device, adjusting phase position of two beams after beam splitting and adjusting intensity. The invention can only utilize one system to produce various vector beams, and can be widely used in the fields of optical manipulation, optical imaging, information transmission, quantum optics, laser machining and the like.

A quantum semiconductor device including quantum dots formed by S-K growth process taking place in a heteroepitaxial system wherein the relationship between the energy level of light holes and the energy level of heavy holes in the valence band is changed by optimizing the in-plane strain and the vertical strain accumulated in a quantum dot.

Random number generators include a thermal optical source and detector configured to produce random numbers based on quantum-optical intensity fluctuations. An optical flux is detected, and signals proportional to optical intensity and a delayed optical intensity are combined. The combined signals can be electrical signals or optical signals, and the optical source is selected so as to have low coherence over a predetermined range of delay times. Balanced optical detectors can be used to reduce common mode noise, and in some examples, the optical flux is directed to only one of a pair of balanced detectors.

The invention discloses a one-dimensional metallic photonic crystal plano-concave mirror for cylindrical symmetrical vectorial light beam focusing, and relates to the field of light field regulation in sub-wavelength photonics. The plano-concave mirror is composed of a one-dimensional metallic photonic crystal with metallic layers and dielectric layers arranged periodically and alternatively, and along the periodic photonic direction of the photonic crystal, one side is a plane while the other side is a hemispherical concave surface. By making full use of negative refraction properties and simultaneous orthogonal polarized light regulation capacity of the photonic crystal, the structure can effectively focus radial and spiral polarized light, and sizes of focused light spots reach sub-wavelength magnitude. In other words, by the structure, sub-wavelength focusing of cylindrical symmetrical vectorial light beams of any polarization component can be realized. By changes on constituent materials and structural parameters, focusing effect can be realized within broadband. The plano-concave mirror is simple in constituent material, easy for designing parameters and structurally easy to produce, and has good application prospects in the fields of near-field optics, quantum optics and the like.

An optical system uses a birefringent medium disposed within an optical cavity, receives an input beam that may be non-coherent or coherent, and produces a randomization energy from the input beam, by creating birefringent induced beam subdivisions each cavity traversal, where after a threshold number of beam traversals have occurred, a randomized energy distribution is created. That randomized energy distribution is read by a photodetector and converted into a random number by a randomization processing device.

The invention provides a chip allowing projection and separation to be performed on arbitrary-polarization-state qubits and a manufacturing method of the chip. The chip comprises a specific-optical-axis birefringent waveguide and a birefringence waveguide directional coupler, wherein the specific-optical-axis birefringent waveguide is provided with an opening in one end face of an optical glass chip, the opening is used for receiving a polarization state to be projected and separated, and the other end of the waveguide is connected with the birefringence waveguide directional coupler. According to the chip and the manufacturing method of the chip, on the basis of the ultrafast laser direct writing type manufacturing technology, the method of laser beam tilted direct writing is adopted, and the chip allowing projection and separation to be performed on arbitrary-polarization-state qubits is composed of a polarization-state conversion element and a polarization-state separation element and is made of transparent hard materials. Moreover, miniaturization and integration of an optical wave plate and polarization beam splitter are achieved, the problems of connection errors, access loss, interface noise and the like in a macroscopic optical path are avoided, system stability and reliability are improved, manufacturing cost is greatly lowered, and manufacturing cycle is greatly shortened.

An organic dielectric material comprises a branched and / or hyperbranched macromolecule having delocalized electrons. Such macro-molecular organic material systems have desirable delocalized charge and optionally one or more micro-crystalline regions. Organic dielectric materials include, for example, branched polyanilines and phthalocyanines. Delocalized excitations within the macromolecular framework of the organic dielectric material may be used in various applications, such as light harvesting, nonlinear optical, quantum optical, and electronic applications, e.g., capacitors. Electrical devices may comprise such dielectric materials, including capacitors that have very high energy density, storage, and transfer. Also provided are methods of preparing such materials.

A squeezed light generator comprises an arbitrary optical fiber, a means for temporally separating two linearly polarized components, two Faraday rotators and a high-reflection mirror. Pulse lights that are temporally separated into two orthogonally polarized components at an intensity ratio of 50:50 are reciprocatively propagated in the optical fiber, and the polarized light is rotated by 90° in an outward transmission. Since those two polarized components pass through the optical paths which are accurately equal to each other in the outward and homeward transmissions, those two polarized components interfere with each other accurately at 50:50 after reciprocation through the fiber. The interfered beam is separated by a polarizing beam splitter that is high in an extinction ratio. When the polarized lights before inputting the fiber and after reciprocating coincide with each other, it is unnecessary to maintain the polarization in the fiber propagation, and an arbitrary fiber can be used.

The invention provides a method for automatically forwardly / reversely tapering a fiber. According to the method, the external envelope of a flame in a fiber heating area in the tapering process is calculated according to the shape of a target fiber, and reciprocating of a flame front is controlled, so that a tapered fiber conforming to a target shape is prepared. Post-treatment of a fiber waveguide is realized by constant-speed reciprocating heating of the dotted flame and simultaneous stretch or compression of two ends of the fiber, and the movement speed of the dotted flame front and the stretch / compression speed of the two ends of the fiber can be optionally adjusted in the forward / reverse tapering process. The linear dispersion characteristic and the nonlinear Kerr characteristic of the tapered fiber can be greatly changed. The tapered fiber can be efficiently and laterally coupled with an external environment. The properties are quite widely applied to fiber optics and a plurality of fields including fiber sensing, optical frequency conversion, super-continuum broadening, quantum optics and the like.

A quantum-illumination receiver is described comprising a phase-conjugation and mixing system for mixing and / or conjugating the idler beam from an entangled light transmitter and the return beam from the target to produce an output beam that is representative of the presence or absence of the target, a light beam collector for receiving a return light beam from the target region and directing the return light beam from a target region to the phase-conjugation and mixing system input, an optical input for receiving an idler light beam from a transmitter and directing the idler light beam from the transmitter to the phase-conjugation and mixing system, a sensor for measuring the output of the phase-conjugation and mixing system, and a processor to process the output of the sensor to make an determination about the presence of the target.

The invention discloses a photo-control liquid crystal spatial light modulator comprising a light source assembly, a dynamic mask generation assembly, a graphic microfilming assembly and an objective table; the light source assembly is used for generating a collimated light beam; the dynamic mask generation assembly is used for performing micro-area modulation on incident light, and comprises a DMD serving as a reflection-type dynamic mask and a control system used for masking graphic input; the graphic microfilming assembly is used for microimaging reflected light output from the dynamic mask generation assembly on a substrate on the objective table, and comprises a convergent lens, and adjustable microscopic objective and a polaroid; and the photo-alignment material is erasable azo dye SD1. An application method of the photo-control liquid crystal spatial light modulator is also disclosed. Through the photo-control liquid crystal spatial light modulator, functions, such as light beam shaping and control, of a traditional spatial light modulator are fulfilled, elements, such as polarization and diffraction, can also be generated, and the photo-control liquid crystal spatial light modulator can be applied to the fields of wave-front correction, light beam control, photo-communication and quantum optics and the like.

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.

The invention discloses a single-frequency fiber laser device with a wide single-longitudinal-mode temperature range. The laser device is composed of a broadband fiber grating, a highly-doped gain fiber, a narrowband fiber grating, a wavelength division multiplexer, a single-mode semiconductor pump laser device and an optical isolator. The single-mode semiconductor pump laser device is used as a pump source to carry out pumping on a resonant cavity; with the fiber grating with the short grating zone length, the reflectivity of the narrowband fiber grating is optimized and improved; and with the ultra-short highly-doped gain fiber as a grain medium, the effective cavity length of the whole resonant cavity is shortened effectively from many aspects and the space between adjacent longitudinalmodes inside the cavity is increased substantially, so that the laser device is able to realize a stable single-frequency laser output within a wide temperature range. The laser device has the wide single-longitudinal-mode temperature range and is protected from being affected by the external environmental temperature in operation; and the stable single longitudinal mode output is realized. The laser device can be applied to fields of space detection, coherent optical communication, Doppler wind-finding radar, gravitational wave detection, and quantum optics and the like.

The invention relates to a laser frequency locking technology, in particular to a frequency locking device for a dual wavelength external cavity resonance system, aiming at solving the problem that no device which locks frequency of the dual wavelength external cavity resonance system by utilizing an HC frequency locking technology exist currently. The frequency locking device for the dual wavelength external cavity resonance system comprises a first laser, a second laser, a first half wave plate, a second half wave plate, a nonlinear crystal and an 8-shaped annular cavity, wherein the 8-shaped annular cavity consists of a first resonator mirror, a second resonator mirror, a third resonator mirror, a fourth resonator mirror and piezoelectric ceramics. The device solves the problem that no device which locks frequency of the dual wavelength external cavity resonance system by utilizing the HC frequency locking technology is provided currently, is suitable for nonlinear optical frequency conversion, and can be applied in the fields of quantum optics, trace gas detection and the like.

The invention provides a single frequency fiber laser with high frequency stability. The laser comprises high gain optical fibers, a narrow-band fiber optical Bragg grating, a broadband fiber optical Bragg grating, a single-mode semiconductor pump light source, a wavelength division multiplexer, an optical fiber isolator, an optical coupler, a frequency discrimination system, an electronic servo system, PZT piezoelectric ceramic and a heat sink which can control temperature automatically. According to the single frequency fiber laser with high frequency stability, a laser short linear cavity structure is adopted, output optical signals act on the frequency discrimination system, generated error signals are transmitted to the electronic servo system, the PZT piezoelectric ceramic is driven to stretch and retract so that closed loop feedback control is formed, and therefore the single frequency fiber laser with the high frequency stability is obtained. The single frequency fiber laser with the high frequency stability can be applied to the fields such as coherent light communication, Doppler windfinding radars, cold atom physical experiments, gravitational wave detection and quantum optics.

The invention belongs to the technical field of quantum private communication and provides a test and verification device for key apparatuses in a QKD (quantum key distribution) system. The device comprises a QKD system sender and a QKD system receiver, and the sender and the receiver are connected through an optical fiber. The device is characterized in that a key agreement module, a classical communication interface, a quantum optical system, a data display and man-machine interaction module and a data analysis module are arranged in each of the sender and receiver, and the data display and man-machine interaction modules are used for setting test parameters of each key apparatus, sending test data collected in the test process to the data analysis modules and displaying and outputting test results obtained by the data analysis module. The test data are calculated and analyzed through the data analysis modules to obtain correlation among the test parameters of the key apparatuses, and reliability and credibility of test conclusion are improved.

The invention relates to an angle measuring device, in particular to an angle measuring device and method based on the Rydberg atom EIT effect, and belongs to the crossing field of quantum optics andmicrowave electric field measurement. The system comprises a detection laser, a coupling laser, a first spectroscope, a second spectroscope, a first reflector, a second reflector, a third reflector, afirst atomic vapor bubble, a second atomic vapor bubble, a first local oscillator microwave source, a second local oscillator microwave source, a first dichroic mirror, a second dichroic mirror, a first photoelectric detector, a second photoelectric detector and a phase comparator. The system has the advantages that the angle obtained through measurement and the relative phase difference betweenthe microwave signals received by the first atom steam bubble and the second atom steam bubble are in linear relation, and the angle measurement precision based on the EIT effect of Rydberg atoms is expected to be further improved; and 2, the system has relatively good anti-interference capability.

The invention belongs to the field of optical devices, and discloses a photonic crystal heterostructure capable of realizing broadband light wave one-way transmission. The photonic crystal heterostructure comprises a silicon dioxide substrate, on which is grown a thin silicon layer. By taking a heterojunction interface as a boundary, a plurality of medium silicon cylinders, which are periodicallyarranged are etched on the left side of the thin silicon layer, are used to form a first photonic crystal structure PC 1, and a plurality of square air holes, which are periodically arranged, are etched on the right side of the thin silicon layer to form a second photonic crystal structure PC 2. The height of the medium silicon cylinder and the depth of the square air holes are equal to the thickness of the thin silicon layer. The light wave is incident from the first photonic crystal structure PC 1 side, and is used to form an included angle of 45 degrees with the heterojunction interface. The photonic crystal heterostructure is easy to prepare, convenient to integrate, high in one-way transmittance, capable of realizing the one-way transmission characteristic of high forward transmissionand capable of being widely applied to the field of quantum optics.

The present invention provides a quantum optical data storage protocol, whose storage time is lengthened by spin population decay time from several minutes to several hours. The quantum data storage includes a first ground state and a second ground state which are closely spaced each other in energy level or degenerated and to forbid two-photon transitions between the first and second ground states; an excited state which has a spin inhomogeneous broadening and to allow two-photon transitions between the first ground state and the second ground sate via the excited state and allow a spin coherence; an auxiliary state for forbidding two-photon transitions between the first and second ground states via the auxiliary state and allowing a transition from / to the excited state; wherein a spin coherence induced by a transition of two photons from the first ground state and the second state to the excited state is transited to the auxiliary state so that a phase decay of the spin coherence is prevented and data is stored as the phase of the spin coherence.

The invention discloses on-chip cascaded MZI reconfigurable quantum network architecture based on lithium niobate. The on-chip cascaded MZI reconfigurable quantum network architecture comprises an input waveguide array serving as a neural network input layer, a plurality of MZIs which are optically connected with the input waveguide array and serve as a neural network hidden layer, a saturable absorber array, a nonlinear optical unit and a detector array serving as a neural network output layer. The MZIs are connected with each other and linearly converted into second array optical signals according to the first array optical signals; each saturable absorber in the saturable absorber array receives a corresponding optical signal in the second array optical signal and nonlinearly converts the optical signal into a third array optical signal, and the third array optical signal is detected by the detector array. According to the invention, the technical problem of on-chip coherent opticalneuromorphic calculation based on a photon integrated circuit is solved, and the limitation of calculation efficiency and power consumption in micro-electronic and hybrid optical electronic implementation is eliminated by a universal and reconfigurable quantum optical neural network.

A gamma-ray bur itinerant detector based on a silicon photoelectric multiplier and digitization time stamping comprises a quantum optics probe module, a SiPM analog signal module, a multiplexer channel coincident circuit module and a flicker pulse signal processing module. According to the gamma-ray itinerant bur itinerant detector, at the earliest stage of photovoltaic conversion, optical signals and analog signals are converted into digital signals, and the digital signals are transmitted to an upper computer or a signal processing unit according to compressed data size. The system can achieve digitization at the earliest stage when an avalanche diode responds photons, and the system has the advantages that the time-space spatial resolution is good, the calculated amount is small, repeatability is good, the adaptability of the system is high, the system is independent of beam characteristics, and the inherent characteristics in beam data can be learned.

The invention provides a making device of a continuous variable entanglement source for signal modulation, belongs to the field of quantum optics and aims at solve the problems of entanglement degree reduction, complicated structure and high cost caused by an existing making device. A single-frequency laser bidirectional pumping degenerate optical parametric oscillator produces signal light and idle light which are separated by a local oscillation light and injection signal light separating system into local oscillation light and injection signal light. After part of signal light, namely the injection signal light, is coupled by an optical fiber coupler, the light is modulated by an electro-optical amplitude modulator and an electro-optical phase modulator to obtain injection signal light produced after modulation for the first time and is reflected by a reflector, the reflected injection signal light is modulated by the electro-optical phase modulator and the electro-optical amplitude modulator and then is reversely injected into the degenerate optical parametric oscillator for parametric amplification, and then a spatially coincident and signal-modulated two-component continuous variable entanglement light field is produced and are separated into two beams by a first optical splitter space. Frequency shift modulation signals required by modulation are produced by a frequency shift signal producing system.

A quantum-illumination receiver is described comprising a phase-conjugation and mixing system for mixing and / or conjugating the idler beam from an entangled light transmitter and the return beam from the target to produce an output beam that is representative of the presence or absence of the target, a light beam collector for receiving a return light beam from the target region and directing the return light beam from a target region to the phase-conjugation and mixing system input, an optical input for receiving an idler light beam from a transmitter and directing the idler light beam from the transmitter to the phase-conjugation and mixing system, a sensor for measuring the output of the phase-conjugation and mixing system, and a processor to process the output of the sensor to make an determination about the presence of the target.

The present invention involves a nanometer bomb which in the dimension of macro-nanometer and is designed on the base of nanometer carbon tube singular light quantum performance and near-infrared laser radiation, belongs to the technology field of nanometer science and quantum optics. It is composed by single wall nanometer carbon tube (1) which two ends are open and laser initiating device (2), the nanometer carbon tube (1) explores under the initiating of certain wave length and laser (2) in certain energy density. And said nanometer carbon tube (1) is single wall nanometer carbon tube which two ends are open, diameter of carbon tube is 1-3nm and the length is 100-400nm; the wave length of the laser used for initiating is 700-900nm, the energy density of the laser is 600-1200mW / cm2. The explosion can generate in micrometer even nanometer dimension, and the explosion scope can be controlled precisely. The invention can apply to biomedical and related fields widely.

The invention belongs to quantum optics and optical communication systems, and particularly relates to a topological photonic crystal composite structure for realizing one-way transmission of light waves based on energy band inversion. A topological photonic crystal composite structure for realizing unidirectional transmission of light waves based on energy band inversion comprises two kinds of two-dimensional photonic crystals PhC1 and PhC2 with the same crystal lattice and the same type, and unidirectional transmission of light is realized on an interface of the two kinds of two-dimensionalphotonic crystals. According to the invention, the structure can realize unidirectional transmission of TM mode light, is immune to defects and impurities, and can provide a new thought for designinga novel optical waveguide for an efficient optical transmission problem.

The invention discloses a waveguide structure integrated photon number resolution superconducting single-photon detector, and the detector comprises a substrate and a SiOx waveguide structure; a superconducting nanowire single photon detection array formed by connecting a plurality of units in series is arranged between the substrate and the SiOx waveguide, and each unit is formed by connecting aresistor and a nanowire in parallel. According to the invention, extremely weak photons transmitted by the waveguide can be detected at a high speed, the number of the detected photons can be distinguished, and the detector has important application in the field of quantum optical chips. A preparation method provided by the invention comprises the following steps: 1, carrying out magnetron sputtering on a niobium nitride superconducting film on a magnesium fluoride substrate; 2, performing photoetching and stripping to prepare an electrode; 3, preparing a nanowire pattern by electron beam lithography, and obtaining a niobium nitride nanowire array by reactive ion etching; 4, photoetching a resistor pattern, and preparing a parallel resistor; 5, preparing a waveguide pattern by electron beam lithography, and carrying out plasma enhanced chemical vapor deposition to deposit the SiOx waveguide. The preparation process disclosed by the invention is simple in steps and higher in yield.