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Using collective atom phase control a population inversion-free photon echoscheme has been studied for quantum memory applications. For the inversion-freephoton echoes a double rephasing method is combined with optical locking, wherethe optical locking coherently controls each atom phase excited by weak datapulses. As a result, intensity flattened, normally ordered, storagetime-extended, and noise-free photon echoes are obtained.

Collective atom phase-controlled noise-free photon echoes using double rephasing and optical locking