Unity gain and non-unity gain quantum teleportation

Details Unity gain and non-unity gain quantum teleportation Unity gain and non-unity gain quantum teleportation

2003-03-31

arxiv.org/abs/quant-ph/0303179v2

IEEE Journal of selected topics in quantum electronics, Vol. 9, pp. 1519, 2003

Physics

Quantum Physics

14 pages, 17 figures

Scientific paper

We investigate continuous variable quantum teleportation. We discuss the methods presently used to characterize teleportation in this regime, and propose an extension of the measures proposed by Grangier and Grosshans \cite{Grangier00}, and Ralph and Lam \cite{Ralph98}. This new measure, the gain normalized conditional variance product $\mathcal{M}$, turns out to be highly significant for continuous variable entanglement swapping procedures, which we examine using a necessary and sufficient criterion for entanglement. We elaborate on our recent experimental continuous variable quantum teleportation results \cite{Bowen03}, demonstrating success over a wide range of teleportation gains. We analyze our results using fidelity; signal transfer, and the conditional variance product; and a measure derived in this paper, the gain normalized conditional variance product.

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