Unity gain and nonunity gain quantum teleportation

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 p...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics 2003-11, Vol.9 (6), p.1519-1532
Main Authors: Bowen, W.P., Treps, N., Buchler, B.C., Schnabel, R., Ralph, T.C., Symul, T., Ping Koy Lam
Format: Article
Language:English
Subjects:
Analysis of variance
Criteria
Entanglement
Gain
Gain measurement
Information systems
Performance evaluation
Physics
Polarization
Quantum computing
Quantum electronics
Quantum entanglement
Quantum teleportation
Signal analysis
Teleportation
Unity
Variance
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Summary: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.
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2003.820908