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Using double optical Raman rephasing, an inversion-free resonant Raman echois studied in an inhomogeneously broadened spin ensemble of a solid medium,where the Raman optical field-excited spin coherence has a frozen propagationvector. Unlike photon echoes whose quantum memory application is strictlylimited due to \pi rephasing pulse-induced population inversion causing quantumnoises, the optical Raman field-excited spin echo is inherently silent owing tothe frozen propagation vector. Thus, the doubly rephased Raman echo can bedirectly applied for quantum interface in a population inversion-freeenvironment.

Inversion-free, noiseless Raman echoes