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Mapping photonic entanglement into and out of a quantum memory

Choi, K. S. and Deng, H. and Kimble, H. J. (2008) Mapping photonic entanglement into and out of a quantum memory. Nature, 452 (7183). pp. 67-71. ISSN 0028-0836. doi:10.1038/nature06670.

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Developments in quantum information science rely critically on entanglement—a fundamental aspect of quantum mechanics that causes parts of a composite system to show correlations stronger than can be explained classically. In particular, scalable quantum networks require the capability to create, store and distribute entanglement among distant matter nodes by means of photonic channels. Atomic ensembles can play the role of such nodes. So far, in the photon-counting regime, heralded entanglement between atomic ensembles has been successfully demonstrated through probabilistic protocols. But an inherent drawback of this approach is the compromise between the amount of entanglement and its preparation probability, leading to intrinsically low count rates for high entanglement. Here we report a protocol where entanglement between two atomic ensembles is created by coherent mapping of an entangled state of light. By splitting a single photon and performing subsequent state transfer, we separate the generation of entanglement and its storage. After a programmable delay, the stored entanglement is mapped back into photonic modes with overall efficiency of 17%. Together with improvements in single-photon sources, our protocol will allow 'on-demand' entanglement of atomic ensembles, a powerful resource for quantum information science.

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Additional Information:© 2008 Nature Publishing Group. Received 16 October 2007; Accepted 3 January 2008. We acknowledge our ongoing collaboration with S. J. van Enk. This research is supported by the Intelligence Advanced Research Projects Activity and by the National Science Foundation. H.D. acknowledges support as Fellow of the Center for the Physics of Information at Caltech. J.L. acknowledges financial support from the European Union (Marie Curie Fellowship). Author Contributions: K.S.C. and H.D. are the principal contributors to the experiment in equal measure.
Funding AgencyGrant Number
Intelligence Advanced Research Projects Activity (IARPA)UNSPECIFIED
Caltech Center for the Physics of InformationUNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Issue or Number:7183
Record Number:CaltechAUTHORS:20121024-090153274
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Official Citation:Choi, K. S., H. Deng, et al. (2008). "Mapping photonic entanglement into and out of a quantum memory." Nature 452(7183): 67-71.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35061
Deposited By: Tony Diaz
Deposited On:24 Oct 2012 17:11
Last Modified:09 Nov 2021 23:12

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