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

Research output: Contribution to journalArticlepeer-review

258 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)549-552
Number of pages4
JournalNature Photonics
Issue number8
Publication statusPublished - 2010 Aug

All Science Journal Classification (ASJC) codes

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


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