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- W2434447947 abstract "We study the effect of a change in size and spatial profile of the pump beam in an atomic-based four-wave mixing process on the size of the coherence area of the generated entangled twin beams. We perform experiments and develop a theoretical model to obtain a measure of the linear extent or ``radius'' of the coherence area from noise measurements of the twin beams as a function of transmission through a variable size slit. Our results show that an increase in the size of the pump reduces the size of the coherence area. More interestingly, we find that the use of a flat-top pump beam of the same size as a Gaussian pump beam leads to a reduction by a factor of more than 2 in the linear extent of the coherence area. This in turn leads to an increase by a factor of more than 4 in the number of spatial modes that make up the twin beams and a resolution enhancement of the entangled images that can be generated with the four-wave mixing process." @default.
- W2434447947 created "2016-06-24" @default.
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- W2434447947 date "2016-06-13" @default.
- W2434447947 modified "2023-09-27" @default.
- W2434447947 title "Control of the size of the coherence area in entangled twin beams" @default.
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- W2434447947 doi "https://doi.org/10.1103/physreva.93.063821" @default.
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