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A quantum memory with telecom-wavelength conversion

A quantum memory with telecom-wavelength conversion
A quantum memory with telecom-wavelength conversion
In a fibre-based quantum information network, telecom-wavelength transmission between quantum memory elements is required to minimize absorption. Owing to the paucity of suitable ground-state atomic transitions, a quantum memory interfaced with telecom light has not been previously realized. We report its demonstration by converting to telecom wavelength near-infrared light emitted on a ground-state transition. The conversion is achieved with a diamond configuration of atomic transitions, in an optically thick gas of cold rubidium. The quantum memory is also realized with cold rubidium, but confined in an optical lattice to suppress motional dephasing on a submillisecond timescale. We observe quantum memory lifetimes in excess of 0.1?s by laser compensation of the lattice light shifts that limited the previous generation of atomic memory to 7?ms. By measuring quantum correlations of light fields before and after telecom down-conversion, transmission and up-conversion, we demonstrate a basic memory element for a scalable, long-distance quantum network
1745-2473
894-899
Radnaev, A. G.
a5647a89-e27b-4b91-ac75-93552535662a
Dudin, Y. O.
c24ba684-bf0d-4936-adf9-d6109015ae5d
Zhao, R.
0d9a8bc7-f0f8-421c-96a2-702f37993d7e
Jen, H. H.
1ac7e88e-379b-4f78-a635-aca530b48f3c
Jenkins, S. D.
65d861fb-b85a-4927-805a-7c906fca26c6
Kuzmich, A.
7f959cd2-805c-4cb6-8938-8d6abcd212ee
Kennedy, T. A. B.
213e8d0b-c02a-4dd8-8ce1-feeac53961c7
Radnaev, A. G.
a5647a89-e27b-4b91-ac75-93552535662a
Dudin, Y. O.
c24ba684-bf0d-4936-adf9-d6109015ae5d
Zhao, R.
0d9a8bc7-f0f8-421c-96a2-702f37993d7e
Jen, H. H.
1ac7e88e-379b-4f78-a635-aca530b48f3c
Jenkins, S. D.
65d861fb-b85a-4927-805a-7c906fca26c6
Kuzmich, A.
7f959cd2-805c-4cb6-8938-8d6abcd212ee
Kennedy, T. A. B.
213e8d0b-c02a-4dd8-8ce1-feeac53961c7

Radnaev, A. G., Dudin, Y. O., Zhao, R., Jen, H. H., Jenkins, S. D., Kuzmich, A. and Kennedy, T. A. B. (2010) A quantum memory with telecom-wavelength conversion. Nature Physics, 6 (11), 894-899. (doi:10.1038/nphys1773).

Record type: Article

Abstract

In a fibre-based quantum information network, telecom-wavelength transmission between quantum memory elements is required to minimize absorption. Owing to the paucity of suitable ground-state atomic transitions, a quantum memory interfaced with telecom light has not been previously realized. We report its demonstration by converting to telecom wavelength near-infrared light emitted on a ground-state transition. The conversion is achieved with a diamond configuration of atomic transitions, in an optically thick gas of cold rubidium. The quantum memory is also realized with cold rubidium, but confined in an optical lattice to suppress motional dephasing on a submillisecond timescale. We observe quantum memory lifetimes in excess of 0.1?s by laser compensation of the lattice light shifts that limited the previous generation of atomic memory to 7?ms. By measuring quantum correlations of light fields before and after telecom down-conversion, transmission and up-conversion, we demonstrate a basic memory element for a scalable, long-distance quantum network

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Published date: September 2010

Identifiers

Local EPrints ID: 175759
URI: http://eprints.soton.ac.uk/id/eprint/175759
ISSN: 1745-2473
PURE UUID: 40d0f744-94be-4755-aadb-2c2ba67e49b5

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Date deposited: 28 Feb 2011 10:09
Last modified: 27 Apr 2022 09:42

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Contributors

Author: A. G. Radnaev
Author: Y. O. Dudin
Author: R. Zhao
Author: H. H. Jen
Author: S. D. Jenkins
Author: A. Kuzmich
Author: T. A. B. Kennedy

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