Experimental demonstration of a heralded entanglement source

Claudia Wagenknecht; Che Ming Li; Andreas Reingruber; Xiao Hui Bao; Alexander Goebel; Yu Ao Chen; Qiang Zhang; Kai Chen; Jian Wei Pan

doi:10.1038/nphoton.2010.123

Experimental demonstration of a heralded entanglement source

Claudia Wagenknecht, Che Ming Li, Andreas Reingruber, Xiao Hui Bao, Alexander Goebel, Yu Ao Chen, Qiang Zhang, Kai Chen, Jian Wei Pan

Department of Engineering Science

Research output: Contribution to journal › Article › peer-review

191 Citations (Scopus)

Abstract

The heralded generation of entangled states is a long-standing goal in quantum information processing, because it is indispensable for a number of quantum protocols^1,2. 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 overhead ^5,6.

Original language	English
Pages (from-to)	549-552
Number of pages	4
Journal	Nature Photonics
Volume	4
Issue number	8
DOIs	https://doi.org/10.1038/nphoton.2010.123
Publication status	Published - 2010 Aug

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics

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10.1038/nphoton.2010.123

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title = "Experimental demonstration of a heralded entanglement source",

abstract = "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 overhead 5,6.",

author = "Claudia Wagenknecht and Li, {Che Ming} and Andreas Reingruber and Bao, {Xiao Hui} and Alexander Goebel and Chen, {Yu Ao} and Qiang Zhang and Kai Chen and Pan, {Jian Wei}",

note = "Funding Information: This work was supported by the European Commission through the European Research Council (ERC) Grant and the Specific Targeted Research Projects (STREP) project Hybrid Information Processing (HIP), the Chinese Academy of Sciences, the National Fundamental Research Program of China under grant no. 2006CB921900, and the National Natural Science Foundation of China. C.W. was additionally supported by the Schlieben-Lange Program of the ESF. The authors are grateful to Dr Xian-Min Jin for help in improving the figures.",

year = "2010",

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AU - Chen, Yu Ao

AU - Zhang, Qiang

AU - Chen, Kai

AU - Pan, Jian Wei

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