Quantum State Transfer Between Matter and Light

Details Quantum State Transfer Between Matter and Light Quantum State Transfer Between Matter and Light

2004-10-12

arxiv.org/abs/quant-ph/0410092v1

Science 306, 663 (2004)

Physics

Quantum Physics

14 pages, 4 figures, to be published in Science

Scientific paper

10.1126/science.1103346

We report on the coherent quantum state transfer from a two-level atomic system to a single photon. Entanglement between a single photon (signal) and a two-component ensemble of cold rubidium atoms is used to project the quantum memory element (the atomic ensemble) onto any desired state by measuring the signal in a suitable basis. The atomic qubit is read out by stimulating directional emission of a single photon (idler) from the (entangled) collective state of the ensemble. Faithful atomic memory preparation and read-out are verified by the observed correlations between the signal and the idler photons. These results enable implementation of distributed quantum networking.

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