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

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

外文摘要：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.

外文关键词：

broadband photon pair sourcespontaneous parametric down-conversiondispersion engineeringthin-film lithium niobate waveguide

作者：

张继宁、张同宇、端家晨、龚彦晓、祝世宁

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作者单位：

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

关键词：

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

出版年：

2024

DOI：

10.1088/1674-1056/ad757c

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

年,卷(期)：2024.33(11)