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Showing 1 to 20 of 26 for “"Parametric down conversion"”.
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Analysis of a Deterministic Entangled Photon Pair Source using Single Photons
… have 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 …
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Entangled optical state creation and characterization
… 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 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
… 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 entanglement can be …
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Quantum nonlinear optics: applications to quantum metrology, imaging, and information
… 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 source of …
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Second order nonlinearities in silicon photonics
… 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 interference …
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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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Applications of single-photon two-qubit quantum logic to the quantum information science
… 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 are …
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Effiziente Erzeugung verschränkter Photonenpaare
… 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 nonlinear …
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Comparison, optimization, and application of various spontaneous parametric downconversion sources of polarization-entangled photon pairs
… 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 that are also …
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Generation and characterization of spectrally factorable biphotons
… 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 our custom …
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High-dimensional Quantum Key Distribution with Frequency Encoding
… 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 to ensure …
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Efficient quantum optical state engineering and applications
… (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 process has …
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Testing the limits of nonlocality
… 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 angle-dependent …
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Quantum Cryptography: From Theory to Practice
… other single photon sources, such as triggering parametric down-conversion (PDC) source. Note that our work, decoy state protocol, has attracted a lot of scientific and media interest. The decoy state QKD becomes a standard technique for prepare-and-measure QKD schemes. Aside from …
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Classical and quantum nonlinear optics in confined photonic structures
… is included. The feasibility of using a parametric down-conversion process to generate squeezed electromagnetic states in 3D photonic crystal microcavity structures is investigated for the first time. The spectrum of the squeezed light is theoretically calculated by using an open cavity …
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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 poor …
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Optical Control over Nuclear Spins
… 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 nuclear …
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Optical nonlinear effects and photon pair production in modulated materials
… 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 exciting …
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