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Unity gain and nonunity gain quantum teleportation

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7 Author(s)
W. P. Bowen ; Dept. of Phys., Australian Nat. Univ., Canberra, ACT, Australia ; N. Treps ; B. C. Buchler ; R. Schnabel
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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 , and Ralph and Lam . This new measure, the gain normalized conditional variance product 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 , 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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IEEE Journal of Selected Topics in Quantum Electronics  (Volume:9 ,  Issue: 6 )