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.

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 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 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.

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.

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.