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Frontiers in Optics

Generation of quantum correlated photons in different spatial modes using few-mode fibers

Cheng Guo, Jie Su, Zhenzhen Zhang, Liang Cui, Xiaoying Li

Published Jan 1, 2018• 0 citations
Publisher

Abstract

We generate photon pairs at 1550 nm telecom through the intermodal four-wave mixing between LP01 and LP11 mode in a few-mode fiber. The ratio of coincidence to accidental coincidence rates is measured to be 28.
DOI
10.1364/ls.2018.lm1b.8

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mode, respectively, via the spontaneous intermodal four-wave mixing in a 100-m-long few-mode fiber. We achieve a coincidence to accidental-coincidence ratio of 28, which clearly indicates the existence of quantum correlation. We also discuss the contribution of spontaneous Raman scattering to the background noise of photon pairs. Our source of photon pairs, compatible with the low-loss multiplexing and de-multiplexing components for space division multiplexing optical fiber communication, can be used for generating higher-dimensional entanglement.
Abstract : We generate photon pairs at telecom wavelength through a spontaneous four-wave mixing process in a short 10 m of highly nonlinear fiber. We use a counter propagating scheme to generate a correlated and entangled photon pair. We observe coincidence to accidental-coincidence ratio of 29 + or - 3 at room temperature (300 K) and as high as 130 + or - 5 when the fiber is cooled to liquid-nitrogen temperature (77 K). Two-photon interference with visibility 98% (92%) and the violation of Bell's inequality by 12 (approx. equal 5) standard deviation are observed at 77 K (300 K), respectively, without subtracting accidental-coincidence count. We obtain a photon-pair production rate about factor 3(2) higher than a 300 m dispersion-shifted fiber at 300 K (77 K).