High speed spatially multimode atomic memory

Details High speed spatially multimode atomic memory High speed spatially multimode atomic memory

2010-12-22

arxiv.org/abs/1012.5016v4

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.

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