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Updated: Jul 5, 2026
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Beamlike high-brightness source of polarization-entangled photon pairs
Xiao-Ling Niu1, Yun-Feng Huang, Guo-Yong Xiang
1Key Laboratory of Quantum Information, Chinese Academy of Sciences (CAS), University of Science and Technology of China, Hefei 230026, China.
Abstract:
We report on an ultrabright beamlike source of polarization-entangled photon pairs that is suitable for the task of multiphoton quantum information processing. The photon pairs are generated from a beamlike type-II parametric downconversion process in two adjacently located but 180 degrees rotated beta-barium borate crystals. Approximately 30,000 s(-1) entangled photon pairs are recorded experimentally with only 100 mW pump power. The fidelity of the generated entangled state as compared with a Bell state is measured to be 0.974 with the method of quantum state tomography. With this source, we also obtain a violation of Bell's inequality by 61 standard deviations in just a few seconds.
