Abstract
Multi-photon entangled states not only play a crucial role in research on quantum physics but also have many applications in quantum information fields such as quantum computation, quantum communication, and quantum metrology. To fully exploit the multi-photon entangled states, it is important to establish the interaction between entangled photons and matter, which requires that photons have narrow bandwidth. Here, we report on the experimental generation of a narrowband four-photon Greenberger–Horne–Zeilinger state with a fidelity of 64.9% through multiplexing two spontaneous four-wave mixings in a cold atomic ensemble. The full bandwidth of the generated GHZ state is about 19.5 MHz. Thus, the generated photons can effectively match the atoms, which are very suitable for building a quantum computation and quantum communication network based on atomic ensembles.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Chao Zhang, Yun-Feng Huang, Cheng-Jie Zhang, Jian Wang, Bi-Heng Liu, Chuan-Feng Li, and Guang-Can Guo
Opt. Express 24(24) 27059-27069 (2016)
Yan Xia, Yi-Hao Kang, and Pei-Min Lu
J. Opt. Soc. Am. B 31(9) 2077-2082 (2014)
Lei Chen, Xiao-Ming Xiu, Li Dong, Nan-Nan Liu, Cai-Peng Shen, Shou Zhang, Shu Chen, and Shi-Lei Su
Opt. Lett. 47(9) 2262-2265 (2022)