Abstract
We experimentally demonstrate Franson interference of a time–energy entangled photon pair generated via collective two-photon coherence in the transition of warm atoms. The two unbalanced Michelson interferometers used in our setup are spatially separated in order to understand entanglement as a nonlocal property of the photon pairs from the warm atomic ensemble. We observe a Franson interference fringe with a high visibility of with continuous-wave-mode photon pairs from the cascade-type atomic ensemble. To the best of our knowledge, this work is the first demonstration of the nonlocal two-photon interference experiment in separated photon channels by use of two-photon pairs emitted from a cascade-type atomic system as originally proposed by Franson [Phys. Rev. Lett. 62, 2205 (1989) [CrossRef] ].
© 2019 Optical Society of America
Full Article | PDF ArticleMore Like This
Jiho Park, Heonoh Kim, and Han Seb Moon
Opt. Lett. 45(8) 2403-2406 (2020)
Gyu-Hyeok Lee, Dong-Gil Im, Yosep Kim, U-Shin Kim, and Yoon-Ho Kim
Opt. Lett. 45(24) 6748-6751 (2020)
Jiho Park, Heonoh Kim, and Han Seb Moon
Photon. Res. 9(1) 49-53 (2021)