摘要
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)×10^(6) pairs/(s·nm·m W).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.
作者
孙宇
孙昌伟
周唯
杨然
端家晨
龚彦晓
徐平
祝世宁
Yu Sun;Chang-Wei Sun;Wei Zhou;Ran Yang;Jia-Chen Duan;Yan-Xiao Gong;Ping Xu;Shi-Ning Zhu(National Laboratory of Solid State Microstructures and School of Physics,Nanjing University,Nanjing 210093,China;NanZhi Institude of Advanced Optoelectronic Integration,Nanjing 210018,China;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)
基金
Project supported by the National Key R&D Program of China(Grant Nos.2022YFF0712800 and 2019YFA0308700)。
