Secure continuous variable quantum teleportation and Einstein-Podolsky-Rosen steering
arXiv:1410.1041 · doi:10.1103/PhysRevLett.115.180502
Abstract
We investigate the resources needed for secure teleportation of coherent states. We extend continuous variable teleportation to include quantum tele-amplification protocols, that allow non-unity classical gains and a pre-amplification or post-attenuation of the coherent state. We show that, for arbitrary Gaussian protocols and a significant class of Gaussian resources, two-way steering is required to achieve a teleportation fidelity beyond the no-cloning threshold. This provides an operational connection between Gaussian steerability and secure teleportation. We present practical recipes suggesting that heralded noiseless pre-amplification may enable high-fidelity heralded teleportation, using minimally entangled yet steerable resources.
5 pages, 4 figures, improved referencing and new proofs, supplementary materials included
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