Light Qubit Storage and Retrieval using Macroscopic Atomic Ensembles

Details Light Qubit Storage and Retrieval using Macroscopic Atomic Ensembles Light Qubit Storage and Retrieval using Macroscopic Atomic Ensembles

2005-05-23

arxiv.org/abs/quant-ph/0505170v2

Physics

Quantum Physics

4 pages, 3 figures For his new version, the original paper has substantially rewritten to make it clearer including completely

Scientific paper

10.1103/PhysRevA.74.011802

We present an experimentally feasible protocol for the complete storage and retrieval of arbitrary light states in an atomic quantum memory using the well-established Faraday interaction between light and matter. Our protocol relies on multiple passages of a single light pulse through the atomic ensemble without the impractical requirement of kilometer long delay lines between the passages. Furthermore, we introduce a time dependent interaction strength which enables storage and retrieval of states with arbitrary pulse shapes. The fidelity approaches unity exponentially without squeezed or entangled initial states, as illustrated by explicit calculations for a photonic qubit.

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