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Experimental demonstration of a heralded entanglement source

Source: Nat. Photonics 4, 549 (2010); doi:10.1038/nphoton.2010.123

Issue Date: August 2010

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Claudia Wagenknecht
[1] Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany [2] These authors contributed equally to this work

Che-Ming Li
[1] Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany [2] Department of Physics and National Center for Theoretical Sciences, National Cheng Kung University, Tainan 701, Taiwan [3] These authors contributed equally to this work

Andreas Reingruber
Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany

Xiao-Hui Bao
[1] Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany [2] Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

Alexander Goebel
Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany

Yu-Ao Chen
[1] Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany [2] Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

Qiang Zhang
Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany

Kai Chen
Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

Jian-Wei Pan
[1] Physikalisches Institut, Ruprecht-Karls-Universitt Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany [2] Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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. Polarization entangled photon pairs are usually generated through spontaneous parametric down-conversion, 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 photons. 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. ©2010

(As supplied by publisher.)

Permalink: http://dx.doi.org/10.1038/nphoton.2010.123
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