Quantum interference between light sources separated by 150 million kilometers
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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. With quantum erasure techniques applied to all degrees of freedom of the otherwise vastly distinct photons, 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.
Deng , Y-H , Wang , H , Ding , X , Duan , Z-C , Qin , J , Chen , M-C , He , Y , He , Y-M , Li , J-P , Li , Y-H , Peng , L-C , Matekole , E S , Byrnes , T , Schneider , C , Kamp , M , Wang , D-W , Dowling , J P , Höfling , S , Lu , C-Y , Scully , M O & Pan , J-W 2019 , ' Quantum interference between light sources separated by 150 million kilometers ' , Physical Review Letters , vol. 123 , no. 8 , 080401 . https://doi.org/10.1103/PhysRevLett.123.080401
Physical Review Letters
© 2019, American Physical Society. This work has been made available online in accordance with the publisher's policies. This is the final published version of the work, which was originally published at https://doi.org/10.1103/PhysRevLett.123.080401
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