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Abstract
In this paper, we demonstrate the generation of high-performance entangled photon-pairs in different degrees of freedom from a single piece of fiber pigtailed periodically poled LiNbO3 (PPLN) waveguide. We utilize cascaded second-order nonlinear optical processes, i.e., second-harmonic generation (SHG) and spontaneous parametric downconversion (SPDC), to generate photon-pairs. Previously, the performance of the photon-pairs is contaminated by Raman noise photons. Here by fiber-integrating the PPLN waveguide with noise-rejecting filters, we obtain a coincidence-to-accidental ratio (CAR) higher than 52,600 with photon-pair generation and detection rate of 52.36 kHz and 3.51 kHz, respectively. Energy-time, frequency-bin, and time-bin entanglement is prepared by coherently superposing correlated two-photon states in these degrees of freedom, respectively. The energy-time entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.71 ± 0.02 with two-photon interference visibility of 95.74 ± 0.86%. The frequency-bin entangled two-photon states achieve fidelity of 97.56 ± 1.79% with a spatial quantum beating visibility of 96.85 ± 2.46%. The time-bin entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.60 ± 0.04 and quantum tomographic fidelity of 89.07 ± 4.35%. Our results provide a potential candidate for the quantum light source in quantum photonics.
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1 University of Electronic Science and Technology of China, Institute of Fundamental and Frontier Sciences, Chengdu, China (GRID:grid.54549.39) (ISNI:0000 0004 0369 4060); University of Electronic Science and Technology of China, Yangtze Delta Region Institute (Huzhou) & School of Optoelectronic Science and Engineering, Huzhou, China (GRID:grid.54549.39) (ISNI:0000 0004 0369 4060)
2 Chinese Academy of Sciences, Shanghai Institute of Microsystem and information Technology, Shanghai, China (GRID:grid.9227.e) (ISNI:0000000119573309)
3 University of Electronic Science and Technology of China, Institute of Fundamental and Frontier Sciences, Chengdu, China (GRID:grid.54549.39) (ISNI:0000 0004 0369 4060); Southwest Institute of Technical Physics, Chengdu, China (GRID:grid.54549.39)
4 University of Electronic Science and Technology of China, Institute of Fundamental and Frontier Sciences, Chengdu, China (GRID:grid.54549.39) (ISNI:0000 0004 0369 4060); University of Electronic Science and Technology of China, Yangtze Delta Region Institute (Huzhou) & School of Optoelectronic Science and Engineering, Huzhou, China (GRID:grid.54549.39) (ISNI:0000 0004 0369 4060); University of Science and Technology of China, CAS Key Laboratory of Quantum Information, Hefei, China (GRID:grid.59053.3a) (ISNI:0000000121679639)
5 University of Electronic Science and Technology of China, Institute of Fundamental and Frontier Sciences, Chengdu, China (GRID:grid.54549.39) (ISNI:0000 0004 0369 4060); Southern University of Science and Technology, Shenzhen Institute for Quantum Science and Engineering, Shenzhen, China (GRID:grid.263817.9)
6 University of Electronic Science and Technology of China, Institute of Fundamental and Frontier Sciences, Chengdu, China (GRID:grid.54549.39) (ISNI:0000 0004 0369 4060); University of Science and Technology of China, CAS Key Laboratory of Quantum Information, Hefei, China (GRID:grid.59053.3a) (ISNI:0000000121679639)