Quantum Interference between Light Sources Separated by 150 Million Kilometers.

@article{Deng2019QuantumIB,
  title={Quantum Interference between Light Sources Separated by 150 Million Kilometers.},
  author={Yu-Hao Deng and Hui Wang and Xing Ding and Zhao-Chen Duan and Jian Qin and M.-C. Chen and Yu Ming He and Yu-Ming He and Jin-Peng Li and Yu-Huai Li and Li-Chao Peng and Elisha S. Matekole and Tim Byrnes and Schneider and M. Kamp and Da-Wei Wang and Jonathan P. Dowling and Sven H{\"o}fling and Chaoyang Lu and Marlan O. Scully and Jian-Wei Pan},
  journal={Physical review letters},
  year={2019},
  volume={123 8},
  pages={
          080401
        }
}
We report an experiment to test quantum interference, entanglement, and nonlocality using two dissimilar photon sources, the Sun and a semiconductor quantum dot on the Earth, which are separated by ∼150  million kilometers. By making the otherwise vastly distinct photons indistinguishable in all degrees of freedom, we observe time-resolved two-photon quantum interference with a raw visibility of 0.796(17), well above the 0.5 classical limit, providing unambiguous evidence of the quantum nature… 

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