A Entangling a photon from the Sun with one from Earth

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Thread starter DrChinese
Start date Feb 7, 2024
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Feb 7, 2024

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TL;DR Summary: Quantum interference between light sources separated by 150 million kilometers

NOTE: This isn't actually Quantum Foundations or Interpretations, but I thought the audience might be best here. Or perhaps regular Quantum Physics or Astronomy? Not sure. Please move if appropriate.

A fun entanglement experiment! How about entangling light emitted from the sun with indistinguishable light created here? The sources are 93 million miles apart!!

Quantum interference between light sources separated by 150 million kilometers

Yu-Hao Deng, Hui Wang, Xing Ding, Z.-C. Duan, Jian Qin, M.-C. Chen, Yu He, Yu-Ming He, Jin-Peng Li, Yu-Huai Li, Li-Chao Peng, E. S. Matekole, Tim Byrnes, C. Schneider, M. Kamp, Da-Wei Wang, Jonathan P. Dowling, Sven Höfling, Chao-Yang Lu, Marlan O. Scully, Jian-Wei Pan (2019)

Abstract: 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 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 the first evidence of quantum nature of thermal light. Further, using the photons with no common history, we demonstrate post-selected two-photon entanglement with a state fidelity of 0.826(24), and a violation of Bell's inequality by 2.20(6). The experiment can be further extended to a larger scale using photons from distant stars, and open a new route to quantum optics experiments at an astronomical scale.

NOTE: This isn't actually Quantum Foundations or Interpretations, but I thought the audience might be best here. Or perhaps regular Quantum Physics or Astronomy? Not sure.

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