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Quantum coherence control is presented for wavelength convertible quantummemory in a double-lambda-type solid ensemble whose spin states areinhomogeneously broadened. Unlike typical atomic media whose spin decay ishomogeneous, a spin inhomogeneously broadened solid ensemble requires acounter-intuitive access in the quantum coherence control to avoid spontaneousemission-caused quantum noises. Such quantum coherence control in a solidensemble results in a near perfect retrieval efficiency and is applicable toultralong photon storage up to the spin phase relaxation time. Here, the basicphysics of the counter-intuitive quantum coherence control is presented notonly for two-photon (Raman) coherent transients, but also for a detailedcoherence transfer mechanism resulting in frequency up-/down-conversion. Thiswork sheds light on potential applications of quantum optical memoriessatisfying noise free, near perfect, ultralong, and multimode photon storage,where quantum repeaters, scalable entangled qubits, and magnetometry would beimminent beneficiaries.

Wavelength convertible quantum memory satisfying ultralong photon storage and near perfect retrieval efficiency