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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Simulation of a non-Markovian evolution using coherence

Marrou Osores, Jean Paul 12 June 2019 (has links)
This thesis will be oriented in the study of open quantum systems. The transition of processes that go between the Markovian and non-Markovian regime will be studied. The diagnose of non-Markovianity will be made in terms of the variation of the coherence of the state. Accordingly, an optical setup will be implemented that allows us to manipulate certain degrees of freedom, like the polarization and the optical path. Theoretically, we have found that the coherence of the system is transferred to the environment and it decreases as we move a parameter that we will take as time. This situation has been confirmed in the experiment. Then, due to the second part of the setup, which produces a non-Markovian evolution by also changing one of its parameters, we have accomplished the goal of returning the information back into the system and to measure the non-Markovianity of the process. / El trabajo de tesis estará orientado al estudio de sistemas cuánticos abiertos. Se estudiará la transición de procesos que van del régimen Markoviano al no Markoviano en forma controlada. El diagnóstico de no Markovianidad se hará en términos de la variación de la coherencia del estado. Para ello se implementará un arreglo óptico que permita manipular varios grados de libertad, tales como polarización y camino óptico. Teóricamente, encontramos que la coherencia del sistema se transfiere al entorno y disminuye al mover uno de estos parámetros que tomaremos como el tiempo, lo que se ha podido comprobar en el experimento. Posteriormente, utilizando otro arreglo que produce una evolución no- Markoviana cambiando uno de sus parámetros también como el tiempo, se ha logrado recuperar la coherencia del sistema. De esta manera se hace posible el retorno de la información y la medición de la no-Markovianidad de dicho proceso.

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