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

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 dispersio...

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Bibliographic Details
Published in:Optics letters 2022-05, Vol.47 (11)
Main Authors: Xin, C. J., Mishra, Jatadhari, Chen, Changchen, Zhu, Di, Shams-Ansari, Amirhassan, Langrock, Carsten, Sinclair, Neil, Wong, Franco C., Fejer, M. M., Lončar, Marko
Format: Article
Language:English
Subjects:
MATERIALS SCIENCE
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Summary: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 ± 5 ) % .
ISSN:0146-9592
1539-4794