Compact generation scheme of path–frequency hyperentangled photons using 2D periodical nonlinear photonic crystal

Hyperentanglement is a promising resource for achieving high capacity quantum communication. Here, we propose a compact scheme for the generation of path–frequency hyperentangled photon pairs via spontaneous parametric down-conversion (SPDC) processes, where six different paths and two different fre...

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Bibliographic Details
Published inChinese physics B Vol. 32; no. 12; pp. 120307 - 120313
Main Authors Chen, Yang-He, Ji, Bo, Li, Nian-Qin, Jiang, Zhen, Li, Wei, Li, Yu-Dong, Feng, Liang-Sen, Wu, Teng-Fei, He, Guang-Qiang
Format Journal Article
LanguageEnglish
Published Chinese Physical Society and IOP Publishing Ltd 01.12.2023
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Summary:Hyperentanglement is a promising resource for achieving high capacity quantum communication. Here, we propose a compact scheme for the generation of path–frequency hyperentangled photon pairs via spontaneous parametric down-conversion (SPDC) processes, where six different paths and two different frequencies are covered. A two-dimensional periodical χ (2) nonlinear photonic crystal (NPC) is designed to satisfy type-I quasi-phase-matching conditions in the plane perpendicular to the incident pump beam, and a perfect phase match is achieved along the pump beam’s direction to ensure high conversion efficiency, with theoretically estimated photon flux up to 2.068 × 10 5 pairs⋅s −1 ⋅mm −2 . We theoretically calculate the joint-spectral amplitude (JSA) of the generated photon pair and perform Schmidt decomposition on it, where the resulting entropy S of entanglement and effective Schmidt rank K reach 3.2789 and 6.4675, respectively. Our hyperentangled photon source scheme could provide new avenues for high-dimensional quantum communication and high-speed quantum information processing.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/ad0625