Physics – Quantum Physics
Scientific paper
2010-12-22
Phys. Rev. A 83, 053810 (2011)
Physics
Quantum Physics
13 pages, 8 figures, submitted to Phys.Rev.A
Scientific paper
10.1103/PhysRevA.83.053810
We study the coherent storage and retrieval of a very short multimode light pulse in an atomic ensemble. We consider a quantum memory process based on the conversion of a signal pulse into a long-lived spin coherence via light matter interaction in an on-resonant Lambda-type system. In order to study the writing and reading processes we analytically solve the partial differential equations describing the evolution of the field and of the atomic coherence in time as well as in space. We show how to optimize the process for writing as well as for reading. If the medium length is fixed, for each length, there is an optimal value of the pulse duration. We discuss the information capacity of this memory scheme and we estimate the number of transverse modes that can be stored as a quantum hologram.
Bramati Alberto
Giacobino Elisabeth
Golubev Yu.
Golubeva Tania
Laurat Julien
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