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

Bruns, Alexander ; Hsu, Chia-Yu ; Stryzhenko, Sergiy ; Giese, Enno ; Yatsenko, Leonid P. ; Yu, Ite A. ; Halfmann, Thomas ; Peters, Thorsten (2022)
Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power.
In: Quantum Science & Technology, 2022, 8 (1)
doi: 10.26083/tuprints-00022824
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power
Language: English
Date: 4 November 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: IOP Publishing
Journal or Publication Title: Quantum Science & Technology
Volume of the journal: 8
Issue Number: 1
Collation: 12 Seiten
DOI: 10.26083/tuprints-00022824
Corresponding Links:
Origin: Secondary publication DeepGreen

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 × 10⁹ pairs/(s MHz mW) we observe nonclassical correlations at pump powers below 100 nW and a narrow bandwidth of 2π × 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.

Uncontrolled Keywords: photon pair sources, single photon sources, hollow core fiber, cold atoms, quantum technology, quantum communication
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-228244
Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 05 Department of Physics > Institute of Applied Physics
Date Deposited: 04 Nov 2022 12:04
Last Modified: 14 Nov 2023 19:05
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22824
PPN: 501608001
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