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Entangled qutrits generated in four-wave mixing without post-selection

Authors :
Wei Zhang
Ming-Xin Dong
Bao-Sen Shi
Shuai Shi
Dong-Sheng Ding
Kai Wang
Ying-Hao Ye
Guang-Can Guo
Yi-Chen Yu
Source :
Optics express. 28(8)
Publication Year :
2020

Abstract

High-dimensional entangled states and quantum repeaters are important elements in efficient long-range quantum communications. The high-dimensional property associated with the orbital angular momentum (OAM) of each photon improves the bandwidth of the quantum communication network. However, the generation of high-dimensional entangled states by the concentration method reduces the brightness of the entangled light source, making extensions to these higher dimensions difficult. To overcome this difficulty, we propose to generate entangled qutrits in the OAM space by loading the pump light with OAM. Compared with the concentration method, our experimental results show that the rate of generation of photon pairs improves significantly with an observed 5.5-fold increase. The increased generation rate provides the system with the ability to resist the noise and improve the fidelity of the state. The S value of the Clauser–Horne–Shimony–Holt inequality increases from 2.48 ± 0.07 to 2.69 ± 0.04 under the same background noise, and the fidelity of the reconstructed density matrix improves from 57.8 ± 0.14% to 70 ± 0.17%. These achievements exhibit the enormous advantages of high-dimensional entanglement generation.

Details

ISSN :
10944087
Volume :
28
Issue :
8
Database :
OpenAIRE
Journal :
Optics express
Accession number :
edsair.doi.dedup.....72f9d2eae89c96a4454f1c957e19b80d