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Coherent control of collective spontaneous emission in an extended atomicensemble resonantly interacting with single-photon wave packets is analyzed. Ascheme for coherent manipulation of collective atomic states is developed suchthat superradiant states of the atomic system can be converted into subradiantones and vice versa. Possible applications of such a scheme for optical quantumstate storage and single-photon wave packet shaping are discussed. It is shownthat also in the absence of inhomogeneous broadening of the resonant line,single-photon wave packets with arbitrary pulse shape may be recorded as asubradiant state and reconstructed even although the duration of the wavepackets is larger than the superradiant life-time. Specifically theapplicability for storing time-bin qubits, which are used in quantumcryptography is analyzed.Comment: 11 pages, 4 figures, submitted to PR

Coherent control of collective spontaneous emission in an extended atomic ensemble and quantum storage