Polarization entanglement by two simultaneous backward phase-matching processes in a single crystal

• URL: http://arxiv.org/abs/2402.18404v1
• Date: Wed, 28 Feb 2024 15:26:54 GMT
• Title: Polarization entanglement by two simultaneous backward phase-matching processes in a single crystal
• Authors: Ming-Yuan Gao, Yin-Hai Li, Zhao-Qi-Zhi Han, Qiang Zhou, Guang-Can Guo, Zhi-Yuan Zhou and Bao-Sen Shi
• Abstract summary: Entanglement enables many promising applications in quantum technology. Here we realize a distinct polarization-entangled source by simultaneously achieving type-0 and type-I backward quasi-phase matching. The emitted photons in both processes have a bandwidth as narrow as 15.7 GHz.
• Score: 4.195738041091666
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement enables many promising applications in quantum technology. Devising new generation methods and harnessing entanglement are prerequisites for practical applications. Here we realize a distinct polarization-entangled source by simultaneously achieving type-0 and type-I backward quasi-phase matching (BQPM) through spontaneous parametric down-conversion in a single bulk crystal, which is different from all previous entangled-source configurations. Pumping the crystal with a single polarized beam generates a non-maximally polarization-entangled state, which can be further projected to a maximal Bell state with a pair of Brewster windows. Hong-Ou-Mandel interference experiments are done on polarization-degenerate photon pairs for both type-0 and type-I BQPM processes for the first time. The emitted photons in both processes have a bandwidth as narrow as 15.7 GHz. The high quality of this source is characterized by various methods. The rather simple configuration, narrow bandwidth, and high entanglement quality make the source very promising for many quantum information tasks.

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