Determining phase coherence time of stored light in warm atomic vapor

In quantum memory based on an atomic medium, we may have a question about whether all information on the stored light is preserved. In particular, the phase coherence between the stored and retrieval light pulses is very interesting, because it can indicate the relationship between the coherence tim...

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Bibliographic Details
Published in:Scientific reports 2017-11, Vol.7 (1), p.15559-7, Article 15559
Main Authors: Jeong, Taek, Park, Jumi, Moon, Han Seb
Format: Article
Language:English
Subjects:
639/624/400/482
639/766/36/1121
639/766/400/1102
Humanities and Social Sciences
Light
multidisciplinary
Science
Science (multidisciplinary)
Vapors
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Summary:In quantum memory based on an atomic medium, we may have a question about whether all information on the stored light is preserved. In particular, the phase coherence between the stored and retrieval light pulses is very interesting, because it can indicate the relationship between the coherence time and storage time of the light. In this paper, we investigate the phase coherence time of light stored in a warm atomic vapor, by examining the beat-note interference between the retrieval light pulse and a reference light beam optically delayed using an optical fiber. The beat-note interference fringes are measured for different reference-light optical delays. The observed retrieval-light phase indicates that the phase of the input probe light is preserved in the medium. However, we further confirm that the retrieval-light phase coherence depends on the phase coherence of the coupling light used for retrieval in the storage process.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-15469-4