Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate

Abstract

Existing nonlinear-optic implementations of pure, unfiltered heralded single-photon sources do not offer the scalability required for densely integrated quantum networks. Additionally, lithium niobate has hitherto been unsuitable for such use due to its material dispersion. We engineer the dispersion and the quasi-phasematching conditions of a waveguide in the rapidly emerging thin-film lithium niobate platform to generate spectrally separable photon pairs in the telecommunications band. Such photon pairs can be used as spectrally pure heralded single-photon sources in quantum networks. We estimate a heralded-state spectral purity of $>94\%$ based on joint spectral intensity measurements. Further, a joint spectral phase-sensitive measurement of the unheralded time-integrated second-order correlation function yields a heralded-state purity of $(86\pm 5)\%$.

arXiv comment4 pages, 4 figures; C. J. Xin and Jatadhari Mishra contributed equally to this work

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• Waveguided sources of consistent, single-temporal-mode squeezed light: the good, the bad, and the ugly
• Efficient generation of broadband photon pairs in shallow-etched lithium niobate nanowaveguide
• Integrated, bright, broadband parametric down-conversion source for quantum metrology and spectroscopy
• On-chip quantum interference between independent lithium niobate-on-insulator photon-pair sources
• Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler
• Amplification of cascaded downconversion by reusing photons with a switchable cavity
• High system efficiency nonlinear frequency conversion on thin-film lithium niobate
• Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation
• From broadband biphotons to frequency combs via spectral compression with time-varying cavities
• Optimal filtering and generation of entangled photons for quantum applications in the presence of noise
• On-Chip Generation of Co-Polarized and Spectrally Separable Photon Pairs
• Scalable quantum interference in integrated lithium niobate nanophotonics