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Coherencia y entrelazamiento en dinámica no Markoviana de qubits

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Author(s): Cristian Edwin Susa Quintero | Jhon Henry Reina Estupiñan

Journal: Universitas Scientiarum
ISSN 0122-7483

Volume: 18;
Issue: 2;
Start page: 141;
Date: 2013;
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Keywords: Qubits | quantum information | entanglement | non-Markovian decoherence | nanostructures.

ABSTRACT
We provide a thorough analysis of the entanglement dynamics of an interacting two-qubit systemin the non-Markovian regime. In such a regime, the time scale on which the reservoir degrees offreedom evolve is either of the same order of magnitude or less than that on which the systemevolves.We used an exact numerical method; the Quasi-Adiabatic Path Integral (QUAPI) technique,to describe the corresponding qubit dissipative dynamics in such a non-Markovian regime. Wecomputed the time evolution of the density operator for the quibits, from which we quantified thecoherences and population dynamics, as well as the qubit-bath coupling effects. Using negativityas a metric, we calculated the dynamics of non-local quantum correlations (entanglement), andindentified a non-Markovian quantum phenomena in terms of early stage disentanglement, and thecollapse and revival of entanglement.
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