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Quantum 2.0 Conference and Exhibition

Shaping Biphoton Spectral Correlations with Orbital Angular Momentum Fiber Modes

Xiao Liu, Dong Beom Kim, Virginia O. Lorenz, Siddharth Ramachandran

Published Jan 1, 2022• 2 citations
Publisher

Abstract

We leverage large channel-count optical fibers supporting orbital angular momentum (OAM) modes to show that near-infrared to telecom photon pairs can be engineered to have arbitrary correlations by choice of mode combinations.
DOI
10.1364/quantum.2022.qth4b.1

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In the realm of quantum information processing, harnessing high-dimensional photonic systems provides a pathway to overcome limitations of traditional two-level systems. Orbital angular momentum (OAM) of light has emerged as a powerful tool for creating and manipulating high-dimensional entanglement, promising increased information capacity and enhanced security in quantum communication protocols. However, conventional methods like spontaneous parametric downconversion encounter challenges due to non-uniform production rates of Laguerre–Gaussian modes. This study explores the potential of spontaneous four-wave mixing in ring-core fibers (RCFs) as a viable platform for generating OAM photon pairs with tailored spectral and spatial properties. We show that by controlling the topological charge of pump photons, correlated, uncorrelated, and anti-correlated photon pairs can be engineered across arbitrary spectral ranges, essential for diverse quantum applications. Experimental noise characterization of the RCF-based source demonstrates a high coincidence-to-accidental ratio exceeding 4000, and a low heralded second-order correlation function ( g H (2) <0.005), which confirms its operation well into the single-photon regime. This work demonstrates the potential of RCFs as a versatile platform for generating structured photon pairs, paving the way for future high-dimensional quantum communication and information processing applications.