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

• URL: http://arxiv.org/abs/2208.05230v2
• Date: Wed, 2 Nov 2022 11:16:59 GMT
• Title: Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power
• Authors: Alexander Bruns, Chia-Yu Hsu, Sergiy Stryzhenko, Enno Giese, Leonid P. Yatsenko, Ite A. Yu, Thomas Halfmann, Thorsten Peters
• Abstract summary: 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.
• Score: 51.961447341691
• License: http://creativecommons.org/licenses/by/4.0/
• 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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