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- W4303474518 abstract "Abstract Nonclassical photon sources of high brightness are key components of quantum communication technologies. We here demonstrate the generation of narrowband, nonclassical photon pairs by employing spontaneous four-wave mixing in an optically-dense ensemble of cold atoms within a hollow-core fiber. The brightness of our source approaches the limit of achievable generated spectral brightness at which successive photon pairs start to overlap in time. For a generated spectral brightness per pump power of up to 2 × 10 9 pairs/(s MHz mW) we observe nonclassical correlations at pump powers below 100 nW and a narrow bandwidth of 2 π × 6.5 MHz. In this regime we demonstrate that our source can be used as a heralded single-photon source. By further increasing the brightness we enter the regime where successive photon pairs start to overlap in time and the cross-correlation approaches a limit corresponding to thermal statistics. Our approach of combining the advantages of atomic ensembles and waveguide environments is an important step toward photonic quantum networks of ensemble-based elements." @default.
- W4303474518 created "2022-10-08" @default.
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- W4303474518 date "2022-11-02" @default.
- W4303474518 modified "2023-10-06" @default.
- W4303474518 title "Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power" @default.
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- W4303474518 doi "https://doi.org/10.1088/2058-9565/ac985c" @default.
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