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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| Main Authors: | , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
30 May 2010
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| 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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| 520 | |a 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. | ||
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