Efficient quantum memory and entanglement between light and an atomic ensemble using magnetic fields

Details Efficient quantum memory and entanglement between light and an atomic ensemble using magnetic fields Efficient quantum memory and entanglement between light and an atomic ensemble using magnetic fields

2005-12-24

arxiv.org/abs/quant-ph/0512226v4

Phys. Rev. A 73 062329 (2006)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.73.062329

We present two protocols, one for the storage of light in an atomic ensemble and the subsequent retrieval, and another one for the generation of entanglement between light and atoms. They rely on two passes of a single pulse through the ensemble, Larmor precessing in an external field. Both protocols work deterministically and the relevant figures of merit - such as the fidelity or the EPR variance - scale exponentially in the coupling strength. We solve the corresponding Maxwell-Bloch equations describing the scattering process and determine the resulting input-output relations which only involve one relevant light mode that, in turn, can be easily accessed experimentally.

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