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Phys Rev Lett. 2006 Jan 27;96(3):030404. doi: 10.1103/PhysRevLett.96.030404. Epub 2006 Jan 25.

Observation of entanglement of a single photon with a trapped atom.

Physical review letters

Jürgen Volz, Markus Weber, Daniel Schlenk, Wenjamin Rosenfeld, Johannes Vrana, Karen Saucke, Christian Kurtsiefer, Harald Weinfurter

Affiliations

  1. Department für Physik, Ludwig-Maximilians-Universität München, D-80799 München, Germany. [email protected]

PMID: 16486671 DOI: 10.1103/PhysRevLett.96.030404

Abstract

We report the observation of entanglement between a single trapped atom and a single photon at a wavelength suitable for low-loss communication over large distances, thereby achieving a crucial step towards long range quantum networks. To verify the entanglement, we introduce a single atom state analysis. This technique is used for full state tomography of the atom-photon qubit pair. The detection efficiency and the entanglement fidelity are high enough to allow in a next step the generation of entangled atoms at large distances, ready for a final loophole-free Bell experiment.

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