Journal
OPTICS LETTERS
Volume 40, Issue 13, Pages 3061-3064Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.40.003061
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We present a highly efficient source for discrete frequency-entangled photon pairs based on spontaneous parametric down-conversion using 3rd-order type-0 quasi-phase matching in a periodically poled MgO-doped stoichiometric LiTaO3 crystal pumped by a 355.66-nm laser. Correlated two-photon states were generated with automatic conservation of energy and momentum in two given spatial modes. These states have a wide spectral range, even under small variations in crystal temperature, which consequently results in higher discreteness. Frequency entanglement was confirmed by measuring two-photon quantum interference fringes without any spectral filtering. (C) 2015 Optical Society of America
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