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Published Online June 12, 2008
Science DOI: 10.1126/science.1158275

Reports

Submitted on March 25, 2008
Accepted on June 4, 2008

Entangled Images from Four-Wave Mixing

Vincent Boyer 1*, Alberto M. Marino 1, Raphael C. Pooser 1, Paul D. Lett 1*

1 Joint Quantum Institute, National Institute of Standards and Technology, University of Maryland, Gaithersburg, MD 20899, USA.

* To whom correspondence should be addressed.
Vincent Boyer , E-mail: vincent.boyer{at}nist.gov
Paul D. Lett , E-mail: paul.lett{at}nist.gov

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. Using a spatially multimode amplifier based on four-wave mixing in a hot vapor, we 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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Science. ISSN 0036-8075 (print), 1095-9203 (online)