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Showing 1 to 8 of 8 for “"PPKTP"”.
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Generation and characterization of spectrally factorable biphotons
… 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 PPKTP crystal. Without applying spectral filtering and using a standard PPKTP crystal, …
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High performance photon-pair source based on a fiber-coupled periodically poled KTiOPO₄ waveguide
… waveguide in periodically poled KTiOPO4 (PPKTP). We perform the flux and spectrum characterization of our integrated waveguide source, and obtain a pair production rate of 2 x 107/s/mW in a 1.08-nm bandwidth. The measurement results are in good agreement with a theoretical model that takes …
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High-quality source of fiber-coupled polarization-entangled photons at 1.56 [mu]m
… 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 97.1% was measured. In addition to the Sagnac source, a linear Mach-Zehnder source at 810 nm was …
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Applications of single-photon two-qubit quantum logic to the quantum information science
… periodically-poled potassium titanyl phosphate (PPKTP) crystal embedded in a polarization Sagnac interferometer and generation of hyper-entangled photon pairs that are simultaneously entangled in the polarization and momentum degrees of freedom. I also introduce deterministic quantum gates based …
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Ultrabright source of polarization-entangled photons from cavity-enhanced downconversion
… periodically-poled potassium titanyl phosphate (PPKTP) crystal. The single-pass free-space photon-pairs produced were demonstrated to be polarization-entangled by measuring the Hong-Ou-Mandel interference dip and measuring a violation of Bell's inequality of 2.711 ± 0.010 (which was greater than …
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High-precision optical and microwave signal synthesis and distribution
… feedback loop. A single type-II phase-matched PPKTP crystal is used to construct a compact and self-aligned balanced optical cross-correlator for precise timing detection.
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High-dimensional entanglement-based quantum key distribution
… photons based on a periodically-poled KTiOPO4 (PPKTP) waveguide, GHz self-differencing InGaAs singlephoton avalanche diodes (SPADs), and the first demonstration of non-locally dispersion-canceled Franson quantum interferometry achieving 99.6% visibility. We then utilize these technologies to …
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Comparison, optimization, and application of various spontaneous parametric downconversion sources of polarization-entangled photon pairs
As benchtop quantum information protocols become increasingly more advanced and the distances over which these experiments are performed become significantly longer, integrated optics provide a small, robust, and practical alternative to traditional bulk optics. Waveguide technology makes it …