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

doi:10.1088/1674-1056/ad757c

中国物理B ›› 2024, Vol. 33 ›› Issue (11): 110301-110301.doi: 10.1088/1674-1056/ad757c

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

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)

National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China

收稿日期:2024-08-09 修回日期:2024-08-29 接受日期:2024-08-30 出版日期:2024-11-15 发布日期:2024-11-15
基金资助:
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).

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

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)

National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China

Received:2024-08-09 Revised:2024-08-29 Accepted:2024-08-30 Online:2024-11-15 Published:2024-11-15
Contact: Yan-Xiao Gong E-mail:gongyanxiao@nju.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

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

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.

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

中图分类号: (Quantum information)

03.67.-a

42.50.-p (Quantum optics) 42.65.-k (Nonlinear optics) 42.82.-m (Integrated optics)

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[J]. 中国物理B, 2024, 33(11): 110301-110301.

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

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

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