Generation of broadband polarization-orthogonal photon pairs via the dispersion-engineered thin-film lithium niobate waveguide

doi:10.1088/1674-1056/ad757c

Abstract Broadband photon pairs are highly desirable for quantum metrology, quantum sensing, and quantum communication. Such sources are usually designed through type-0 phase-matching spontaneous parametric down-conversion (SPDC) that makes the photon pairs hard to separate in the frequency-degenerate case and thus limits their applications. In this paper, we design a broadband frequency-degenerate telecom-band photon pair source via the type-II SPDC in a dispersion-engineered thin-film lithium niobate waveguide, where the polarization modes of photon pairs are orthogonal and thus are easily separated deterministically. With a 5-mm-long waveguide, our design can achieve a bandwidth of 5.56 THz (44.8 nm), which is 8.6 times larger than that of the bulk lithium niobate, and the central wavelength can be flexibly adjusted. Our design is a promising approach towards high-quality integrated photon sources and may have wide applications in photonic quantum technologies.

Keywords: broadband photon pair source spontaneous parametric down-conversion dispersion engineering thin-film lithium niobate waveguide

Received: 09 August 2024
Revised: 29 August 2024
Accepted manuscript online: 30 August 2024

PACS:	03.67.-a	(Quantum information)
	42.50.-p	(Quantum optics)
	42.65.-k	(Nonlinear optics)
	42.82.-m	(Integrated optics)

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0705000), Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301500), Leading-edge Technology Program of Jiangsu Natural Science Foundation (Grant No. BK20192001), and the National Natural Science Foundation of China (Grant Nos. 51890861 and 11974178).

Corresponding Authors: Yan-Xiao Gong
E-mail: gongyanxiao@nju.edu.cn

Cite this article:

Ji-Ning Zhang(张继宁), Tong-Yu Zhang(张同宇), Jia-Chen Duan(端家晨), Yan-Xiao Gong(龚彦晓), and Shi-Ning Zhu(祝世宁) Generation of broadband polarization-orthogonal photon pairs via the dispersion-engineered thin-film lithium niobate waveguide 2024 Chin. Phys. B 33 110301

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Generation of broadband polarization-orthogonal photon pairs via the dispersion-engineered thin-film lithium niobate waveguide

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