Interferometer-Free Polarization-Entangled Photon Source Using Single Periodic Domain Structure
Chun-Yao Yang1,2, Chao-Yuan Wang1,2*, Kuan-Heng Lin1,2, Tsung-Ying Tsai1,2, Chih-Chia Lin1,2, Li-Bang Wang1,2, Chih-Sung Chuu1,2
1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
2Center for Quantum Technology, National Tsing Hua University, Hsinchu, Taiwan
* Presenter:Chao-Yuan Wang,
Polarization-entangled photons are essential to many quantum technologies and fundamental studies. In this paper, we propose and demonstrate a novel method that generates polarization-entangled photons by exploiting single periodic domain structure in a nonlinear crystal to realize two types of phase-matching necessary for the polarization entanglement. The compact source, without the need of interferometers, delicate domain structures, and post-selection, is advantageous for scalable quantum computing and communication, where many replicas or chip-scale devices are needed.

Keywords: Quantum entanglement, Bell inequality, Entangled photons