Experimental demonstration of quantum memory for light

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dc.creatorJulsgaard, Brian
dc.creatorSherson, Jacob
dc.creatorCirac, J. Ignacio
dc.creatorFiurasek, Jaromir
dc.creatorPolzik, Eugene S.
dc.date2004-10-11
dc.date.accessioned2026-07-07T06:11:04Z
dc.date.available2026-07-07T06:11:04Z
dc.descriptionThe 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.
dc.description22 pages (double line spacing) incl. supplementary information, 4 figures, accepted for publication in Nature
dc.identifierhttps://arxiv.org/abs/quant-ph/0410072
dc.identifierhttp://arxiv.org/abs/quant-ph/0410072
dc.identifierNature 432, 482 - 486 (25 November 2004)
dc.identifierdoi:10.1038/nature03064
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/92431
dc.subjectQuantum Physics
dc.titleExperimental demonstration of quantum memory for light
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