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Experimental demonstration of a heralded entanglement source

The heralded generation of entangled states is a long-standing goal in quantum information processing, because it is indispensable for a number of quantum protocols1,2. Polarization entangled photon pairs are usually generated through spontaneous parametric down-conversion3, but the emission is prob...

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Bibliographic Details
Main Authors: Wagenknecht, Claudia Martina (Author) , Li, Che-Ming (Author) , Reingruber, Andreas (Author) , Bao, Xiao-Hui (Author) , Goebel, Alexander Matthias (Author) , Chen, Yu-Ao (Author) , Zhang, Qiang (Author) , Chen, Kai (Author) , Pan, Jian-Wei (Author)
Format: Article (Journal)
Language:English
Published: 30 May 2010
In: Nature photonics
Year: 2010, Volume: 4, Issue: 8, Pages: 549-552
ISSN:1749-4893
DOI:10.1038/nphoton.2010.123
Online Access:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1038/nphoton.2010.123
Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/nphoton.2010.123
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Author Notes:Claudia Wagenknecht, Che-Ming Li, Andreas Reingruber, Xiao-Hui Bao, Alexander Goebel, Yu-Ao Chen, Qiang Zhang, Kai Chen, and Jian-Wei Pan
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Summary:The heralded generation of entangled states is a long-standing goal in quantum information processing, because it is indispensable for a number of quantum protocols1,2. Polarization entangled photon pairs are usually generated through spontaneous parametric down-conversion3, but the emission is probabilistic. Their applications are generally accompanied by post-selection and destructive photon detection. Here, we report a source of entanglement generated in an event-ready manner by conditioned detection of auxiliary photons4. This scheme benefits from the stable and robust properties of spontaneous parametric down-conversion and requires only modest experimental efforts. It is flexible and allows the preparation efficiency to be significantly improved by using beamsplitters with different transmission ratios. We have achieved a fidelity better than 87% and a state preparation efficiency of 45% for the source. This could offer promise in essential photonics-based quantum information tasks, and particularly in enabling optical quantum computing by reducing dramatically the computational overhead5,6.
Item Description:Gesehen am 27.09.2023
Physical Description:Online Resource
ISSN:1749-4893
DOI:10.1038/nphoton.2010.123

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