Nonlocal Rydberg enhancement for four-wave-mixing biphoton generation

Year: 2024

Authors: Zhao HM., Zhang XJ., Artoni M., La Rocca GC., Wu JH.

Autors Affiliation: Northeast Normal Univ, Sch Phys, Changchun 130024, Peoples R China; Northeast Normal Univ, Ctr Quantum Sci, Changchun 130024, Peoples R China; Brescia Univ, Dept Engn & Informat Technol, I-25133 Brescia, Italy; European Lab Nonlinear Spect, I-50019 Sesto Fiorentino, Italy; Ist Nazl Ott CNR CNR INO, I-50019 Sesto Fiorentino, Italy; Scuola Normale Super Pisa, NEST, I-56126 Pisa, Italy.

Abstract: Tunable Rydberg interactions in cold atoms can be used to generate strongly correlated photon pairs through a spontaneous four -wave -mixing process in which all driving fields are allowed to work on resonance. The scheme relies on electromagnetically induced transparency and an imbalanced dark state with most atoms trapped in a ground state and a weakly populated Rydberg state. We show in particular that the combination of these two effects results in negligible linear absorption and Raman gain at the Stokes and anti -Stokes frequencies of generated photon pairs, while the nonlocal (Rydberg) nonlinearities contribute significantly to the enhancement of photon -pair generation rates and cross correlations at very low pump strengths and optical depths.

Journal/Review: PHYSICAL REVIEW A

Volume: 109 (4)      Pages from: 43711-1  to: 43711-11

More Information: This work is supported by the National Natural Science Foundation of China (Grants No. 12074061 and No. 62375047) , the Italian PNRR MUR (Grant No. PE0000023-NQSTI) , European Union, Next Generation EU’ Integrated Infrastructure Initiative in Photonic and Quantum Sciences (I-PHOQS, IR0000016, ID D2B8D520) , the Fund for International Activities at the University of Brescia, and the Fund from Jilin Province (Grant No. 20220502002GH) . H.-M.Z. and J.-H.W. would like to thank Scuola Normale Superiore for their kind hospitality.
KeyWords: Photon Pairs; Optics
DOI: 10.1103/PhysRevA.109.043711

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