Storage and retrieval of continuous-variable polarization-entangled cluster states in atomic ensembles

Details Storage and retrieval of continuous-variable polarization-entangled cluster states in atomic ensembles Storage and retrieval of continuous-variable polarization-entangled cluster states in atomic ensembles

2011-05-24

arxiv.org/abs/1105.4814v2

Phys. Rev. A 84, 022328 (2011)

Physics

Quantum Physics

6 pages, 4 figures

Scientific paper

We present a proposal for storing and retrieving a continuous-variable quadripartite polarization-entangled cluster state, using macroscopic atomic ensembles in a magnetic field. The Larmor precession of the atomic spins leads to a symmetry between the atomic canonical operators. In this scheme, each of the four spatially separated pulses passes twice through the respective ensemble in order to map the polarization-entangled cluster state onto the long-lived atomic ensembles. The stored state can then be retrieved by another four read-out pulses, each crossing the respective ensemble twice. By calculating the variances, we analyzed the fidelities of the storage and retrieval, and our scheme is feasible under realistic experimental conditions.

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