High-efficiency On-chip Quantum Photon Source in Modal Phase-matched Lithium Niobate Nanowaveguide

Abstract

Thin-film lithium niobate on insulator~(LNOI) emerges as a promising platform for integrated quantum photon source, enabling scalable on-chip quantum information processing. The most popular technique to overcome the phase mismatching between interacting waves in waveguide is periodic poling, which is intrinsically sensitive to poling uniformity. Here, we report an alternative strategy to offset the phase mismatching of spontaneous parametric down-conversion~(SPDC) process, so-called modal phase matching, in a straight waveguide fabricated on a dual-layer LNOI. The dual-layer LNOI consists of two 300~nm lithium niobates with opposite directions, which significantly enhances the spatial overlap between fundamental and high-order modes and thus enables efficient SPDC. This dual-layer waveguide generates photon pairs with pair generation rate of 41.77~GHz/mW, which exhibits excellent signal-to-noise performance with coincidence-to-accidental ratio up to 58298$\pm$1297. Moreover, we observe a heralded single-photon source with second-order autocorrelation $g_H^{(2)}(0)<0.2$ and heralded rate exceeding 100~kHz. Our results provide an experiment-friendly approach for efficient generation of quantum photon sources and benefit the on-chip quantum information processing based on LNOI.

6 pages, 4 figures

References in corpus (12)

• Experimental One-Way Quantum Computing
• Ultrahigh-efficiency second-harmonic generation in nanophotonic PPLN waveguides
• 12-photon entanglement and scalable scattershot boson sampling with optimal entangled-photon pairs from parametric down-conversion
• Entangled photon-pair generation in periodically-poled thin-film lithium niobate waveguides
• Second harmonic generation in nano-structured thin-film lithium niobate waveguides
• Experimental demonstration of topological error correction
• Optical parametric generation in a lithium niobate microring with modal phase matching
• Ultra-bright multiplexed energy-time entangled photon generation from lithium niobate on insulator chip
• Secret sharing of a quantum state
• Ultra-efficient and highly-tunable second-harmonic generation in Z-cut periodically poled lithium niobate nanowaveguides
• Efficient generation of broadband photon pairs in shallow-etched lithium niobate nanowaveguide
• Design of spontaneous parametric down-conversion in integrated hybrid SixNy-PPLN waveguides

Cited by in corpus (1)

• Advancing the heralded photon-number-state characterization by understanding the interplay of experimental settings