Browsing by Author "Vinck-Posada, Hebert"

Now showing 1 - 3 of 3
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    Entanglement properties of quantum polaritons
    (2016) Suarez Forero, D. G.; Cipagauta, G.; Vinck-Posada, Hebert; Fonseca Romero, K. M.
    Exciton polaritons are coupled states of matter and light, originated by the strong interaction between an optical and semiconductor excitons. This interaction be obtained also single-particle level, in which case it has been shown that a quantum treatment is mandatory. In this work we study the light-matter entanglement of polaritons from a fully quantum formalism including pumping and dissipation. We find that the entanglement is completely destroyed if the exciton and photon are tuned at the resonance condition, even under very low pumping rates: Instead, the best condition for maximizing entanglement and purity of the steady state is when the exciton and photon are out of resonance and when incoherent pumping exactly compensates the dissipation rate. In the presence of multiple quantum dots coupled to the light mode, matter-light entanglement survives only at larger detuning for a higher number of quantum dots considered.
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    Espectro de emisión de un sistema de cavidades acopladas con un punto cuántico
    (2013) Gómez, Fabiola; Vinck-Posada, Hebert; Rodríguez, Boris A.
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    The Role of a Polariton Bath in the Emission Spectrum of an Open Nanocavity-Quantum Dot System
    (2013-09-17) Moure, Nicolas; Vinck-Posada, Hebert; Rodríguez, Boris A.
    We investigate the effect of a polariton bath on the photoluminescence (PL) spectrum in confined nanocavity-quantum dot (nC-QD) systems. We model the nC-QD system as a two-level exciton in strong coupling with a single photonic cavity mode interacting with its environment. The non- Hamiltonian processes induced by the environment are taken into account via a Born-Markov master equation which includes: gain and loss of excitons and photons into/out of the cavity, a dephasing mechanism produced by phonon scattering in the semiconductor lattice and gain and loss of polaritons due to the already mentioned polariton bath. In order validate our phenomenological model, we fit an experimental spectrum to extract the values of all parameters appearing in the master equation. Our results show that polariton pumping and loss rates are comparable to the other parameters and therefore we have a first evidence that the polariton bath we proposed has a significant role in the dynamics of a nC-QD system