To overcome the fundamental limitations of the π 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. © 2012 American Physical Society.
CITATION STYLE
Ham, B. S. (2012). Coherent control of collective atom phase for ultralong, inversion-free photon echoes. Physical Review A - Atomic, Molecular, and Optical Physics, 85(3). https://doi.org/10.1103/PhysRevA.85.031402
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