Abstract
We analytically show that probabilistic amplification of a weak
coherent state stored inside an atomic medium can be achieved via
detection of coherently scattered photons. We show that this is
because of collective excitations created among atoms in the ensemble.
We describe the physics of the amplification and identify the failure
events, which occur during the amplification process. The
amplification is realized by coherently mapping a weak coherent state
in an ensemble of $ \Lambda $-level atoms followed by detection of
multiple Raman scattered photons, conditionally projecting the
coherent state into an amplified state upon retrieval.
© 2019 Optical Society of
America
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