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

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

2011-10-16

arxiv.org/abs/1110.3478v1

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

To overcome fundamental limitations of the \pi 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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