Surpassing the standard quantum limit for optical imaging using nonclassical multimode light.

  title={Surpassing the standard quantum limit for optical imaging using nonclassical multimode light.},
  author={Nicolas Treps and Ulrik Lund Andersen and Ben C. Buchler and Ping Koy Lam and Agn{\`e}s Ma{\^i}tre and Hans-A. Bachor and Claude Fabre},
  journal={Physical review letters},
  volume={88 20},
Using continuous wave superposition of spatial modes, we demonstrate experimentally displacement measurement of a light beam below the standard quantum limit. Multimode squeezed light is obtained by mixing a vacuum squeezed beam and a coherent beam that are spatially orthogonal. Although the resultant beam is not squeezed, it is shown to have strong internal spatial correlations. We show that the position of such a light beam can be measured using a split detector with an increased precision… 

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