Quantum State Transfer Between Matter and Light
Abstract
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 readout 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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We acknowledge fruitful conversations with T. A. B. Kennedy, J. A. Sauer, L. You, A. Zangwill and, particularly, M. S. Chapman and thank R. Smith and E. T. Neumann for experimental assistance. This work was supported by NASA and the Research Corporation.
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Published In
Science
Volume 306 | Issue 5696
22 October 2004
22 October 2004
Copyright
American Association for the Advancement of Science.
Submission history
Received: 28 July 2004
Accepted: 16 September 2004
Published in print: 22 October 2004
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