Portal de Periódicos da CAPES

Equivalence between Entanglement and the Optimal Fidelity of Continuous Variable Teleportation

2005; American Physical Society; Volume: 95; Issue: 15 Linguagem: Inglês

10.1103/physrevlett.95.150503

1092-0145

Gerardo Adesso, Fabrizio Illuminati,

Wireless Communication Security Techniques

We devise the optimal form of Gaussian resource states enabling continuous-variable teleportation with maximal fidelity. We show that a nonclassical optimal fidelity of N-user teleportation networks is necessary and sufficient for N-party entangled Gaussian resources, yielding an estimator of multipartite entanglement. The entanglement of teleportation is equivalent to the entanglement of formation in a two-user protocol, and to the localizable entanglement in a multiuser one. Finally, we show that the continuous-variable tangle, quantifying entanglement sharing in three-mode Gaussian states, is defined operationally in terms of the optimal fidelity of a tripartite teleportation network.