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Originally published in Science Express on 12 June 2008
Science 25 July 2008:
Vol. 321. no. 5888, pp. 544 - 547
DOI: 10.1126/science.1158275
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Reports

Entangled Images from Four-Wave Mixing

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

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.

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

* To whom correspondence should be addressed. E-mail: vincent.boyer{at}nist.gov (V.B.); paul.lett{at}nist.gov (P.D.L.)

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Science. ISSN 0036-8075 (print), 1095-9203 (online)