Coherent control of collective atom phase for ultralong, inversion-free photon echoes

  • Ham B
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Abstract

To overcome the fundamental limitations of the p optical pulse-induced
population inversion and optical decay-caused short storage time
in conventional photon echoes, a coherent control of collective atoms
is studied for inversion-free, optical decay-halted photon echoes,
where the constraint of photon storage time is now replaced by a
spin population decay process. Using phase-controlled double rephasing,
an inversion-free photon echo scheme is obtained, where no spontaneous
or stimulated emission-driven quantum noise exists. Thus, the present
method can be applied for ultralong quantum memories in quantum repeaters
for long-distance quantum communications.

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Authors

  • Byoung S. Ham

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