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arXiv · 2208.05230

Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power

Alexander Bruns·Chia-Yu Hsu·Sergiy Stryzhenko·Enno Giese·Leonid P. Yatsenko·Ite A. Yu·Thomas Halfmann·Thorsten Peters
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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 $2\times 10^{9} \ \textrm{pairs/(s MHz mW)}$ we observe nonclassical correlations at pump powers below $100 \textrm{nW}$ and a narrow bandwidth of $2\pi\times 6.5 \ \textrm{MHz}$. 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 towards photonic quantum networks of ensemble based elements.

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Alexander Bruns, Chia-Yu Hsu, Sergiy Stryzhenko, Enno Giese, Leonid P. Yatsenko, Ite A. Yu, Thomas Halfmann, Thorsten Peters. 2022-08-10. Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power. https://doi.org/10.1088/2058-9565%2Fac985c

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