Time-Energy Entangled Photon Pairs from Doppler-Broadened Atomic Ensemble via Collective Two-Photon Coherence

We experimentally demonstrate two-photon interference of a time-energy entangled photon pair generated via collective two-photon coherence in Doppler-broadened cascade-type ^{87}Rb atoms. The two photons originally proposed by J. D. Franson are realized as a photon pair due to collective effects, wh...

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Bibliographic Details
Published in:Physical review letters 2018-12, Vol.121 (26), p.263601-263601, Article 263601
Main Authors: Park, Jiho, Jeong, Taek, Kim, Heonoh, Moon, Han Seb
Format: Article
Language:English
Subjects:
Coherence
Entanglement
Interference
Photons
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Summary:We experimentally demonstrate two-photon interference of a time-energy entangled photon pair generated via collective two-photon coherence in Doppler-broadened cascade-type ^{87}Rb atoms. The two photons originally proposed by J. D. Franson are realized as a photon pair due to collective effects, which are generated from the cascade atomic system with a relatively long lifetime of the initial state and a considerably shorter lifetime of the intermediate state. The achievement of two-photon interference with photon-pair sources generated from inhomogeneous atomic ensembles constitutes an important result for time-energy entanglement based on an atom-photon interaction.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.263601