Physics – Quantum Physics
Scientific paper
2004-10-11
Nature 432, 482 - 486 (25 November 2004)
Physics
Quantum Physics
22 pages (double line spacing) incl. supplementary information, 4 figures, accepted for publication in Nature
Scientific paper
10.1038/nature03064
The information carrier of today's communications, a weak pulse of light, is an intrinsically quantum object. As a consequence, complete information about the pulse cannot, even in principle, be perfectly recorded in a classical memory. In the field of quantum information this has led to a long standing challenge: how to achieve a high-fidelity transfer of an independently prepared quantum state of light onto the atomic quantum state? Here we propose and experimentally demonstrate a protocol for such quantum memory based on atomic ensembles. We demonstrate for the first time a recording of an externally provided quantum state of light onto the atomic quantum memory with a fidelity up to 70%, significantly higher than that for the classical recording. Quantum storage of light is achieved in three steps: an interaction of light with atoms, the subsequent measurement on the transmitted light, and the feedback onto the atoms conditioned on the measurement result. Density of recorded states 33% higher than that for the best classical recording of light on atoms is achieved. A quantum memory lifetime of up to 4 msec is demonstrated.
Cirac Juan Ignacio
Fiurasek Jaromir
Julsgaard Brian
Polzik Eugene S.
Sherson Jacob
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