Counterpropagating path-entangled photon pair sources based on simultaneous spontaneous parametric down-conversion processes of nonlinear photonic crystal

Yang, Can; Xi, Chaoxiang; Jing, Jietai; He, Guangqiang

doi:10.1364/oe.26.027945

Cited by 3 publications

(1 citation statement)

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“…Specifically, photonic crystals such as periodically poled lithium niobate (PPLN) and periodically poled potassium titanyl phosphate (PPKTP), designed using quasi-phase matching (QPM) technology, enable a range of optical parametric processes, possessing both high efficiency and flexibility. [29][30][31] This versatility facilitates advanced scientific investigations into novel quantum entanglement sources, contributing to cutting-edge research in the field.…”

Section: Introductionmentioning

confidence: 99%

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

Chen 陈,

Ji 季,

Li 李

et al. 2023

Chinese Phys. B

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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 $\chi^{(2)}$ 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/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 of entanglement $S$ 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.

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Section: Introductionmentioning

confidence: 99%