Unity gain and non-unity gain quantum teleportation

Abstract

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.

14 pages, 17 figures

References in corpus (19)

• Experimental quantum teleportation
• Separability Criterion for Density Matrices
• Inseparability criterion for continuous variable systems
• Quantum Teleportation is a Universal Computational Primitive
• Continuous variable quantum cryptography using coherent states
• Teleportation of Quantum States
• Multipartite entanglement for continuous variables: A quantum teleportation network
• Experimental investigation of continuous variable quantum teleportation
• An experimental investigation of criteria for continuous variable entanglement
• Quantum teleportation of light beams
• Quantum teleportation with squeezed vacuum states
• No-cloning theorem and teleportation criteria for quantum continuous variables
• Entanglement swapping using continuous variables
• Quantum versus Classical Domains for Teleportation with Continuous Variables
• Stokes operator squeezed continuous variable polarization states
• Teleportation of a Bose-Einstein condensate state by controlled elastic collisions
• Tailoring teleportation to the quantum alphabet
• Interferometric Tests of Teleportation
• Quantum teleportation criteria for continuous variables