期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.040504
关键词
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资金
- European project CHIST-ERA QScale
- European project FP7-CIPRIS [MC ITN-287252]
- ERC Starting grant QuLIMA
- Spanish MINECO OQISAM project [FIS2012-37569]
- Beatriu de Pinos program [2010BP B0014]
- ICREA Funding Source: Custom
We report on experiments demonstrating the reversible mapping of heralded single photons to long-lived collective optical atomic excitations stored in a Pr3+:Y2SiO5 crystal. A cavity-enhanced spontaneous down-conversion source is employed to produce widely nondegenerate narrow-band (approximate to 2 MHz) photon pairs. The idler photons, whose frequency is compatible with telecommunication optical fibers, are used to herald the creation of the signal photons, compatible with the Pr3+ transition. The signal photons are stored and retrieved using the atomic frequency comb protocol. We demonstrate storage times up to 4.5 mu s while preserving nonclassical correlations between the heralding and the retrieved photon. This is more than 20 times longer than in previous realizations in solid state devices, and implemented in a system ideally suited for the extension to spin-wave storage.
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