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      Secure Continuous Variable Teleportation and Einstein-Podolsky-Rosen Steering

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          Abstract

          We investigate the resources needed for secure teleportation of coherent states. We extend continuous variable teleportation to include quantum teleamplification protocols that allow nonunity classical gains and a preamplification or postattenuation 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 preamplification may enable high-fidelity heralded teleportation, using minimally entangled yet steerable resources.

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          Most cited references64

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          Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels

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            Unconditional quantum teleportation

            Quantum teleportation of optical coherent states was demonstrated experimentally using squeezed-state entanglement. The quantum nature of the achieved teleportation was verified by the experimentally determined fidelity Fexp = 0.58 +/- 0.02, which describes the match between input and output states. A fidelity greater than 0.5 is not possible for coherent states without the use of entanglement. This is the first realization of unconditional quantum teleportation where every state entering the device is actually teleported.
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              Teleportation of Continuous Quantum Variables

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                Author and article information

                Journal
                PRLTAO
                Physical Review Letters
                Phys. Rev. Lett.
                American Physical Society (APS)
                0031-9007
                1079-7114
                October 2015
                October 27 2015
                : 115
                : 18
                Article
                10.1103/PhysRevLett.115.180502
                26565449
                31d7541a-1154-49d1-88bd-95cd46a4a84f
                © 2015

                http://link.aps.org/licenses/aps-default-license

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