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Atomic frequency comb (AFC) made of an ensemble of atoms with a periodicoptical resonance was originally proposed as a viable approach for quantummemory for photons. In this paper, we examine the quantum cloning capacity ofan AFC in terms of the spectral distribution of the atomic populations in theenergy levels associated by the optical transition. Expressions are derived forthe memory readout efficiency, signal to noise ratio, and fidelity for an inputat the single photon level. When applied to a square toothed AFC, our analysisshows that there is a region where amplification from the excited state resultsin greater than unit recall efficiency, while maintaining a fidelity greaterthan the classical limit.

Quantum Memory and Quantum Cloning in Atomic Frequency Comb