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Advanced Devices & Instrumentation

Program-controlled generation of on-chip single soliton for high-visibility two-photon interference

Guangshu Wang, Fang‐Xiang Wang, Long Huang, Sheng-Teng Zheng, Weiqiang Wang, Wenfu Zhang, Wei Chen, Zhen-fu Han

Published Sep 20, 2026• 0 citations
Publisher
DOI
10.34133/adi.0204

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Integrated quantum photonic technologies require scalable devices with high-visibility quantum interference. Recent studies have demonstrated that lithium niobate on insulator enables efficient nonlinear interactions, via quasi-phase matching in periodically poled lithium niobate (PPLN) waveguides. However, the on-chip control of two-photon interference utilizing path entanglement remains limited. In this study, we demonstrate on-chip generation of single-photon sources via quantum interference using path-entangled N00N states in two ways. Using the basic structure of a reverse Hong–Ou–Mandel (RHOM) configuration, we directly observe high on-chip visibility of quantum interference. We achieve a visibility of 97.7% ± 1.1% using a dual-PPLN waveguide as the basic RHOM configuration. To improve the compactness, efficiency, and stability of on-chip operation, we further incorporate a PPLN ring resonator with a Sagnac loop. This allows counter-propagating paths to share a single periodically poled waveguide, achieving a visibility of 84.4% ± 1.6%. These results demonstrate that lithium niobate on insulator (LNOI)-based quantum photonic systems provide a robust foundation for the development of future integrated quantum technologies.
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The integrated photonic chip is a promising way to realize future quantum technology. Here we demonstrate a two-photon interference in the standard telecommunication band on a silica-on-silicon integrated photonic chip. Two identical photons in the 1.55 μm band, which are indistinguishable in spatial, frequency and polarization, are generated by type-I collinear spontaneous parametric down-conversion via bismuth borate. The silica-on-silicon integrated chip, which has an insertion loss less than 1 dB, is a Mach–Zehnder interferometer with a thermo-optic phase shifter. A high visibility of 100% in the classical interference and 99.2% in the two-photon interference is achieved, indicating that the two-photon interference with high interference visibility on the chip is attained successfully.