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Publication Citation: Waveguide source of correlated photon pairs for chip-scale quantum information processing

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Author(s): Jun Chen; Aaron Pearlman; Alexander E. Ling; Jingyun Fan; Alan L. Migdall;
Title: Waveguide source of correlated photon pairs for chip-scale quantum information processing
Published: August 26, 2009
Abstract: We present a systematic study of a correlated photon-pair source based on a periodically-poled KTiOPO4 (PPKTP) waveguide. The waveguide was fabricated on a KTiOPO4 crystal supporting type-II parametric down-conversion. In addition, periodic poling was applied along the waveguide to quasi-phase-match the type-0 down-conversion process. The design pump wavelength is 532 nm, and the wavelengths of the down-converted, correlated photons are around 900 nm and 1300 nm. We examine the two-photon correlation spectra and singlephoton spectra at a variety of temperature and power settings for both type-0 and type II down-conversion processes. Our study shows that the waveguide source has a number of advantages compared to its bulk-crystal counterpart, including higher spectral brightness, narrower emission bandwidth and single spatial-mode output. With greatly simplified engineering, this compact, highly efficient, low photon-loss, and cost-effective waveguide source of correlated photon pairs is promising for future chip-scale quantum information processing applications.
Citation: SPIE Conference Proceedings
Volume: 7465
Pages: 13 pp.
Keywords: spontaneous parametric down conversion; correlated photons; waveguide; joint spectrum
Research Areas: Quantum Optics, Quantum Information, Entangled Photons, Quantum Devices, Single Photon Sources, Squeezing, Correlated Photon Radiometry
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