Teletransporte de estados cuánticos: Fidelidad de la transferencia
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Cano Fernández, Luis Elvis
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Trabajo de grado - Maestría
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EspañolFecha de publicación
2014
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Se estudio la fdelidad del teletransporte de un qubit cuando los recursos sufren decoherencia. Consideramos procesos de ruido idénticos pero independientes para cada parte de los estados iniciales de Bell empleados como recurso. Cuando sobre las dos partes del recurso actua el canal de despolarización, el recurso particular de Bell no juega ningun role en la fidelidad promedio de teletransporte. Sin embargo, si las dos partes se afectan por el canal de desfasamiento, la concurrecia de los estados iniciales de Bell se vuelven diferentes cuando pasa el tiempo. Estados iniciales de Bell cuyas concurrencias son menos afectados por el ruido llevan a fidelidades de teletransporte mayor, como se esperaba. Finalmente, si las dos partes son sujetas al ruido de disipación de la amplitud, estados iniciales de Bell cuya concurrencia es menor pueden conducir a mayores fidelidades de teletransporte.
Abstract. We study the fidelity of the teleportation of a single qubit when the resource suffers decoherence. We consider identical but independent noise processes for each party of the initial Bell state employed as a resource. When both parties of the resource undergo depolarization, the particular Bell resource plays no role on average teleportation fidelity. However, if both parties are affected by a dephasing channel, the concurrence of different initial Bell states becomes different as time passes by. Initial Bell states whose concurrence is less affected by the noise lead to larger teleportation fidelities, as expected. Finally, if both parties are subject to an amplitude damping noise, initial Bell states whose concurrence is smaller may lead to larger teleportation fidelities.
Abstract. We study the fidelity of the teleportation of a single qubit when the resource suffers decoherence. We consider identical but independent noise processes for each party of the initial Bell state employed as a resource. When both parties of the resource undergo depolarization, the particular Bell resource plays no role on average teleportation fidelity. However, if both parties are affected by a dephasing channel, the concurrence of different initial Bell states becomes different as time passes by. Initial Bell states whose concurrence is less affected by the noise lead to larger teleportation fidelities, as expected. Finally, if both parties are subject to an amplitude damping noise, initial Bell states whose concurrence is smaller may lead to larger teleportation fidelities.