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Quantum teleportation with continuous variables: A survey

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Laser Physics

Abstract

Very recently, we took part in a new development of quantum information, the so-called continuous variable (CV) quantum information theory. Such a further development is mainly due to the experimental and theoretical advantages offered by CV systems, i.e., quantum systems described by a set of observables, like position and momentum, which have a continuous spectrum of eigenvalues. According to this novel trend, quantum information protocols like quantum teleportation have been suitably extended to the CV framework. Here, we briefly review some mathematical tools relative to CV systems, and we consequently develop the concepts of quantum entanglement and teleportation in the CV framework by analogy with the qubit-based approach. Some connections between teleportation fidelity and entanglement properties of the underlying quantum channel are inspected. Next, we address the study of CV quantum teleportation networks where more users share a multipartite state and an arbitrary pair of them performs quantum teleportation. In this context, we show alternative protocols, and we investigate the optimal strategy that maximizes the performance of the network.

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Authors and Affiliations

  1. Dipartimento di Fisica, Università di Camerino, via Madonna delle Carceri, Camerino, I-6203S, Italy

    S. Pirandola & S. Mancini

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  1. S. Pirandola
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  2. S. Mancini
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Original Text © Astro, Ltd., 2006.

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Pirandola, S., Mancini, S. Quantum teleportation with continuous variables: A survey. Laser Phys. 16, 1418–1438 (2006). https://doi.org/10.1134/S1054660X06100057

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  • DOI: https://doi.org/10.1134/S1054660X06100057

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