Congratulations to Sheng-hung Wang for winning the Student Paper Award (Oral) in the section of "Quantum Electronics and Laser Technology," OPTIC 2023
Comb-Like Time-Frequency Entanglement via Two-Photon Interference and Distribution
Sheng-Hung Wang 1,3, Yen-Hung Chen 2,3, Pin-Ju Tsai 2,3
1. Department of Physics, National Central University, Zhongli, Taiwan
2. Department of Optics and Photonics, National Central University, Zhongli, Taiwan
3. Center for Quantum Technology, National Central Universit, Zhongli, Taiwan
Abstract
Quantum entanglement is crucial in quantum technologies, encompassing quantum communication and quantum computing. The exploration of time-frequency entanglement (TFE) with a comb-like structure has been quite discussed, owing to its high-dimensional entanglement and inherent robustness for propagation in long-distance fiber networks. In this study, we develop a time-frequency comb entangled photon source by using a hybrid interferometer that combined Franson and Hong–Ou–Mandel interference. This setup allows us to generate and verify comb-like time-frequency entanglement in photon pairs simultaneously. To demonstrate the advantages of time-frequency entanglement in long-distance fiber networks, we further separated two photons with a 2.64 km fiber in National Central University, and achieve an interference visibility of 88.9%, which surpasses the classical limit of 70.7% by a significant margin. The developed method offers a compact solution for quantum information processing encoded in frequency, contributing to the broader landscape of quantum technologies and their potential applications in the real world.
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