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Conference on Lasers and Electro-Optics

Heralded Generation of a Three-Photon N00N State

Heonoh Kim, Hee Su Park, Sang-Kyung Choi

Published Jan 1, 2009• 0 citations
Publisher

Abstract

A heralded three-photon NOON state is generated from two pairs of photons produced by spontaneous parametric down-conversion (SPDC). The measured four-photon coincidences reveal fringes three times finer than single-photon interference.
DOI
10.1364/iqec.2009.iwf4

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Over the past decade, counter-propagating spontaneous parametric down-conversion (CPSPDC) has attracted interest due to its ability to generate narrowband and spectrally pure photon pairs without the need for strong spectral filtering. While prior work has established the spectral characteristics of CPSPDC, its performance as a heralded single-photon source (HSPS) remains limited. Here, we present a detailed HSPS characterization of a first-order quasi-phase-matched CPSPDC source based on a sub-μm periodically poled potassium titanyl phosphate crystal. We measure an internal pair-generation rate of 1.3×10 3 pairs/s/mW under CW pumping, in addition to a high coincidence-to-accidental ratio exceeding 1.4×10 5 , and furthermore obtain the lowest heralded second-order correlation value of (8.57±4.95)×10 -6 ever reported. We also show a Hong–Ou–Mandel interference experiment that yields a raw visibility of 70±1%, confirming photon indistinguishability. These results demonstrate CPSPDC as a strong candidate for generating high-quality single photons for quantum information processing and long-distance quantum communication applications.