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 19 of 19 for “"spontaneous parametric down-conversion"”.
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Entangled optical state creation and characterization
We describe a typical 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 …
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In search of photonic bound entanglement: using hyperentanglement to study mixed entangled states
… polarization-spatial-mode 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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Second order nonlinearities in silicon photonics
… pave the way through 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
… photon pairs 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 …
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Applications of single-photon two-qubit quantum logic to the quantum information science
… photon pair source based on a collinear spontaneous parametric down conversion (SPDC) process within a bidirectionally pumped periodically-poled potassium titanyl phosphate (PPKTP) crystal embedded in a polarization Sagnac interferometer and generation of hyper-entangled photon pairs that …
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Comparison, optimization, and application of various spontaneous parametric downconversion sources of polarization-entangled photon pairs
… of both highly nondegenerate and degenerate Spontaneous Parametric Down-Conversion waveguide sources of collinear polarization-entangled photon pairs using various entanglement methods determined by the relevant application. Our ultimate goal is to create polarization-entangled photon pairs …
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Generation and characterization of spectrally factorable biphotons
… date without any spectral filtering, by pulsed spontaneous parametric down-conversion (SPDC) in a custom-fabricated periodically-poled KTiOPO₄ (PPKTP) crystal under extended Gaussian phase-matching conditions. The high purity achieved is made possible by the Gaussian phase-matching function of …
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High-dimensional Quantum Key Distribution with Frequency Encoding
… time-energy entanglement elimination in the spontaneous parametric down-conversion (SPDC) process through custom engineering of phase-matching conditions. The heralded single-photon source is useful in measurement-based quantum applications, where indistinguishable single photons are required …
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Efficient quantum optical state engineering and applications
… first absorbing (and 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 …
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Testing the limits of nonlocality
… Our entangled photon pairs are created through spontaneous parametric down-conversion within a pair of adjacent, orthogonally oriented nonlinear crystals. The quality and brightness of this source is then dramatically improved through the use of birefringent crystals which compensate for an …
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High dimensional spatial entanglement with photon pairs
… is a theoretical investigation 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 …
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Quantum nonlinear optics: applications to quantum metrology, imaging, and information
… pairs of single photons 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 …
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Growth, characterization and implementation of semiconductor sources of highly entangled photons
… sources based on the probabilistic spontaneous parametric down-conversion (SPDC). Unfortunately, their susceptibility to perturbations from the solid-state environment significantly affects the photon coherence and entanglement degree. Furthermore, most quantum dot types suffer from …
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Optical Control over Nuclear Spins
… widely used in quantum science. For example, the spontaneous parametric down-conversion can be applied to create entangled photon pairs. If nuclear spins can be manipulated with optical approaches, then it would facilitate a number of potential applications. However, an efficient interface between …
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Optical nonlinear effects and photon pair production in modulated materials
… dichalcogenide MoS2, and test its potential for spontaneous parametric down-conversion (SPDC) i.e. amplification of vacuum fluctuations mediated by optical nonlinearity. We present a model of SPDC in MoS2 monolayers and show that our data are compatible with theoretical estimates. We show …
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High resolution measurement of telecommunication component polarization mode dispersion by means of quantum interferometry
… generated in the process of collinear type-II Spontaneous Parametric Down Conversion (SPDC). Our result paves the way for building future test and measurement devices that will be capable of resolving even smaller PMD values in discrete components of future optical communication systems, …
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Polarization Sensitive Imaging Techniques Using Quantum Entangled Qubits
… photons, generated in a type-II crystal via spontaneous parametric down-conversion. In contrast with its classical counterpart, PS-QOCT provides resolution enhancement and immunity to even- order group velocity dispersion. A proof-of-principle of this technique was demonstrated a while ago …
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Effiziente Erzeugung verschränkter Photonenpaare
… important step forward 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 …
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Towards optical quantum communication in space
"To build a global quantum communication network, low-transmission, fiber-based communication channels can be supplemented by using a free-space channel between a satellite and a ground station on Earth. To this end, we have developed a system that generates hyperentangled photonic ""ququarts'' and …