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# Storage and retrieval of single photons transmitted between remote quantum memories

## Abstract

An elementary quantum network operation involves storing a qubit state in an atomic quantum memory node, and then retrieving and transporting the information through a single photon excitation to a remote quantum memory node for further storage or analysis. Implementations of quantum network operations are thus conditioned on the ability to realize matter-to-light and/or light-to-matter quantum state mappings. Here we report the generation, transmission, storage and retrieval of single quanta using two remote atomic ensembles. A single photon is generated from a cold atomic ensemble at one site 1, and is directed to another site through 100 metres of optical fibre. The photon is then converted into a single collective atomic excitation using a dark-state polariton approach2. After a programmable storage time, the atomic excitation is converted back into a single photon. This is demonstrated experimentally, for a storage time of 0.5 microseconds, by measurement of an anti-correlation parameter. Storage times exceeding ten microseconds are observed by intensity cross-correlation measurements. This storage period is two orders of magnitude longer than the time required to achieve conversion between photonic and atomic quanta. The controlled transfer of single quanta between remote quantum memories constitutes an important step towards distributed quantum networks.

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## Acknowledgements

This work was supported by NASA, Office of Naval Research Young Investigator Program, National Science Foundation, Research Corporation, Alfred P. Sloan Foundation, and Cullen-Peck Chair. We thank M. S. Chapman for discussions and E. T. Neumann for experimental assistance.

## Author information

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Correspondence to A. Kuzmich.

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## Supplementary information

### Supplementary Notes

This file contains additional information on the theory of electromagnetically induced transparency (EIT) for atoms with Zeeman degeneracy, which is essential for adequate modelling of the system. We also include details of the analysis of the photoelectron counting statistics of the light fields detected in our experiment, in support of generation, storage, and retrieval of single photon states of the electromagnetic field. (PDF 167 kb)

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Chanelière, T., Matsukevich, D., Jenkins, S. et al. Storage and retrieval of single photons transmitted between remote quantum memories. Nature 438, 833–836 (2005). https://doi.org/10.1038/nature04315

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• DOI: https://doi.org/10.1038/nature04315

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