Journal
SCIENCE
Volume 321, Issue 5888, Pages 544-547Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1158275
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Two beams of light can be quantum mechanically entangled through correlations of their phase and intensity fluctuations. For a pair of spatially extended image- carrying light fields, the concept of entanglement can be applied not only to the entire images but also to their smaller details. We used a spatially multimode amplifier based on four- wave mixing in a hot vapor to produce twin images that exhibit localized entanglement. The images can be bright fields that display position- dependent quantum noise reduction in their intensity difference or vacuum twin beams that are strongly entangled when projected onto a large range of different spatial modes. The high degree of spatial entanglement demonstrates that the system is an ideal source for parallel continuous- variable quantum information protocols.
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