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Recovering information in probabilistic quantum teleportation |
Luis Roa1, Andrea Espinoza2, Ariana Muñoz1,3, María L. Ladrón de Guevara2( ) |
1. Departamento de Física, Universidad de Concepción, Casilla 160-C, Concepción, Chile
2. Departamento de Física, Universidad Católica del Norte, Angamos 0610, Antofagasta, Chile
3. Facultad de Ingeniería, Universidad Autónoma de Chile, 5 Poniente 1670, Talca, Chile |
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Abstract In this paper we redesign the probabilistic teleportation scheme considered in Phys. Rev. A 61, 034301 (2000) by Wan-Li Li et al., where the optimal state extraction protocolcomplements the basic teleportation process with a partially entangled pure state channel, in order to transfer the unknown state with fidelity 1. Unlike that scheme, where the information of the unknown state is lost if the state extraction fails, our proposal teleports exactly and optimally an unknown state, and allows to recover faithfully that state when the process has not succeeded. In order to study the resilience of the scheme, we apply it to the teleportation problem through a quantum channel in a mixed state with pure dephasing. We find that a successful process transfers an unfaithful state, namely, the outcome state acquires the decoherence of the channel, but the unknown state is recovered by the sender with fidelity 1 if the teleportation fails. In addition, in this case, the fidelity of the teleported state has quantum features only if the channel has an amount of entanglement different from zero.
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| Keywords
quantum information
teleportation
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Corresponding Author(s):
María L. Ladrón de Guevara
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Issue Date: 22 November 2019
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