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Degenerate polarization entangled photon source based on a single Ti-diffusion lithium niobate waveguide in a polarization Sagnac interferometer |
| Yu Sun(孙宇)1, Chang-Wei Sun(孙昌伟)2, Wei Zhou(周唯)1, Ran Yang(杨然)1, Jia-Chen Duan(端家晨)1, Yan-Xiao Gong(龚彦晓)1, Ping Xu(徐平)3,†, and Shi-Ning Zhu(祝世宁)1 |
1. National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China;
2. NanZhi Institude of Advanced Optoelectronic Integration, Nanjing 210018, China;
3. Institute for Quantum Information and State Key Laboratory of High Performance Computing, College of Computer Science and Technology, National University of Defense Technology, Changsha 410073, China |
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Abstract Combining a Ti-diffusion periodically poled lithium niobate (PPLN) waveguide with a Sagnac interferometer, two opposite directions type-II spontaneous parametric down conversions (SPDC) occur coherently and yield a high brightness, high stability polarization entanglement source. The source produces degenerate photon pairs at 1540.4 nm with a brightness of B = (1.36±0.03)×106 pairs/(s· nm·mW). We perform quantum state tomography to reconstruct the density matrix of the output state and obtain a fidelity of F=0.983±0.001. The high brightness and phase stability of our waveguide source enable a wide range of quantum information experiments operating at a low pump power as well as hold the advantage in mass production which can promote the practical applications of quantum technologies.
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Received: 11 May 2023
Revised: 11 May 2023
Accepted manuscript online: 25 May 2023
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PACS:
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03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.-a
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(Quantum information)
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42.50.Dv
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(Quantum state engineering and measurements)
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42.65.-k
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(Nonlinear optics)
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| Fund: Project supported by the National Key R&D Program of China (Grant Nos.2022YFF0712800 and 2019YFA0308700). |
Corresponding Authors:
Ping Xu
E-mail: pingxu520@nju.edu.cn
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Cite this article:
Yu Sun(孙宇), Chang-Wei Sun(孙昌伟), Wei Zhou(周唯), Ran Yang(杨然), Jia-Chen Duan(端家晨), Yan-Xiao Gong(龚彦晓), Ping Xu(徐平), and Shi-Ning Zhu(祝世宁) Degenerate polarization entangled photon source based on a single Ti-diffusion lithium niobate waveguide in a polarization Sagnac interferometer 2023 Chin. Phys. B 32 080308
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