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2015 ; 5
(ä): 13609
Nephropedia Template TP
Sci Rep
2015[Aug]; 5
(ä): 13609
PMID26314514
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Quantum entanglement provides an essential resource for quantum computation,
quantum communication, and quantum network. How to conveniently and efficiently
produce entanglement between bright light beams presents a challenging task to
build realistic quantum information processing networks. Here, we present an
efficient and convenient way to realize a novel quantum phenomenon, named
electromagnetically induced entanglement, in the conventional ?-type three-level
atomic system driven by a strong pump field and a relatively weak probe field.
Nearly perfect entanglement between the two fields can be achieved with a low
coherence decay rate between the two lower levels, high pump-field intensity, and
large optical depth of the atomic ensemble. The physical origin is quantum
coherence between the lower doublet produced by the pump and probe fields,
similar to the well-known electromagnetically induced transparency. This method
would greatly facilitate the generation of nondegenerate narrow-band
continuous-variable entanglement between bright light beams by using only
coherent laser fields, and may find potential and broad applications in realistic
quantum information processing.