Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 65 for “"down-conversion"”.
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Advanced silicon photonics for microwave frequency down-conversion
… of a microwave photonic system, a frequency down-converter. This device takes two electronic input signals and outputs the difference between the two input frequencies. To date, all demonstrations of a photonic microwave frequency down-converter have been based on bulk optical devices that …
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Frequency down-conversion for quantum networking with nitrogen-vacancy centers in diamond
Quantum frequency conversion (QFC) devices are critical to building long-distance quantum networks, which would connect quantum memories located at distant nodes through optical channels for efficient entanglement distribution. The nitrogen-vacancy (NV) center in diamond is an attractive candidate …
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An optical-electrical sub-sampling down-conversion receiver with continuous-time [Sigma] [Delta] modulation
… of an optical-electrical sub-sampling down-conversion receiver that employs [Sigma] [Delta] modulation. Accurate sub-sampling of an electrical RF signal in the optical domain is achieved by using a low-jitter mode-locked-laser and a high-bandwidth interferometer. The sub-sampled …
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Efficient quantum optical state engineering and applications
… thereby destroying) them. Spontaneous parametric down-conversion, a process in which one high-energy photon splits into two lower-energy photons, allows us to prepare a single-photon state by detecting one of the photons, which then heralds the existence of its twin. This process has been the …
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Development in utilizing singlet fission and triplet-triplet annihilation to improve solar cell efficiency
… and studied to increase solar cell power conversion efficiency. Singlet fission splits a singlet exciton into two lower energy triplet excitons. This energy down conversion is efficient and have shown near 200% triplet exciton yield. With energy down conversion, thermalization loss in …
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Analysis of a Deterministic Entangled Photon Pair Source using Single Photons
… been proposed independently both with parametric down conversion source and single photon sources. We modify the latter scheme to implement it as an on demand entangled photon pair source and analyse its performance considering inefficient detectors, inefficient quantum memories and inefficient …
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Triggered infrared emitter displays for individual identify friend-or-foe (IIFF) and vehicular mounted indentify friend-or-foe (VMIFF) devices.
… An area for further research using quantum dots down conversion is offered. Quantum dots down conversion could be used for wavelength tuning of the polymer organic light emitting material.
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Entangled optical state creation and characterization
… type-I phasematched Spontaneous Parametric Down Conversion (SPDC) crystal setup and characterize the quality of the source as a function of state fidelity and strength of Bell's inequality violation. Experimental results show a Bell statistic of 2.23 with a fidelity of 0.745 with the …
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Coupling Down Converted Light Into Single Mode Fibers
… on the collection efficiency of Type I down converted photons into single mode fibers. For best single and coincidence counting rates, we find that the mode sizes should be close to the same size and that the mode waists should be located near the down-conversion crystal. Larger …
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Effiziente Erzeugung verschränkter Photonenpaare
… was the introduction of spontaneous parametric down conversion (SPDC), which has become the most common source in quantum optics for generating correlated or entangled photon pairs. In this process photons of an intense pump laser convert to photon pairs in an optical nonlinear crystal. …
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Design of software radio
… like decimation, interpolation, digital up-conversion and digital down conversion are done on reprogrammable Digital Signal Processor or Field Programmable Gate Arrays.Twelve laboratory exercises have been designed to lead the student through the process of using the Universal Software Radio …
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Efficient and coherent frequency conversions and nonlinear interference in optical parametric and atomic Raman processes
<p>By implementing a parametric down-conversion process with a strong signal field injection, we demonstrate that frequency down-conversion from pump photons to idler photons can be a coherent process. Contrary to a common misconception, we show that the process can be free of quantum noise. With …
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In search of photonic bound entanglement: using hyperentanglement to study mixed entangled states
… states generated by spontaneous parametric down-conversion from a second-order TEM mode pump. Some of the subtleties involved in preparing genuine mixed states in the lab are discussed.
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High dimensional spatial entanglement with photon pairs
… of the process of spontaneous parametric down-conversion, which consists in pumping a crystal with a laser to create entangled pairs of photons. In particular, it is an investigation of the properties of the entangled pairs that are created and on how their entanglement can be measured. We …
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Quantum nonlinear optics: applications to quantum metrology, imaging, and information
… via the process of spontaneous parametric down conversion (SPDC). This process is mediated by the second order nonlinear susceptibility of the material. When pumped in a high gain regime, these crystals give rise to optical parametric amplification, which is a viable source of squeezed …
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Concept Demonstrator for MeerKAT Operation from 14.5 to 20 GHz
… consists of a feed horn antenna and front-end down conversion receiver ready for integration with back-end digital signal processing. The antenna design was carried out using electromagnetic simulation software and system level simulation software was used for the front-end receiver. A single …
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Science and applications of infrared semiconductor nanocrystals
… UV-IR dual band detectors based on luminescent down conversion. In this design, NCs absorb UV light and re-emit the light in the infrared band of an InGaAs detector. The high quantum yields of infrared nanocrystals and unique absorption profile are shown to provide a significant advantage over …
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Second order nonlinearities in silicon photonics
… the demonstration of spontaneous parametric down-conversion in silicon.
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High-quality source of fiber-coupled polarization-entangled photons at 1.56 [mu]m
… based on a collinear spontaneous parametric down-conversion process in a bidirectionally pumped periodically-poled potassium titanyl phosphate (PPKTP) crystal inside a polarization Sagnac interferometer at communication wavelength (1.56 [mu]m). A two-photon quantum interference visibility of …
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Automatic generation of an LC voltage controlled oscillator
… as phase locked loops, frequency synthesizers, down conversion receivers, and clock generators. A typical design flow for a VCO involves architecture selection based on specification, calculation of circuit parameters, simulation, and iterations of circuit parameters based on the simulation …
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