We investigated the interaction between two coupled cavities, each one of them interacting with a two-level atom in its interior. We observed that if one of the atoms is in a superposition state and the other parts of the system are in their fundamental states, it is possible to transfer this state to the atom in the other cavity through the temporal evolution of the system. The time-evolution behaviour of the system during this transfer was studied and we observed its dependence with the frequency of the atom and the coupling constant between the atom and its respective cavity.
In this paper, we study a system formed by two electromagnetic cavities coupled by an optical fibre, where each cavity interacts with a trapped ion. In this model we observe that it is possible to transmit two-qubit states from the ion in cavity 1 to the ion in cavity 2, both connected by an optical fibre. The mentioned states consist of vibration and internal degrees of freedom of the ions. The presence of a reservoir with temperature T = 0 is included in the model. Taking into account the presence of the reservoir, we conclude that the transmission is reliable even for dissipation rates observed in experiments.
The interaction between identical two-level atoms with a system that consists of two coupled cavities connected by an optical fiber was investigated. With new bosonic operators, the interaction Hamiltonian between the fiber and the cavities can be diagonalized (Pellizzari's model1). In the strong coupling regime (cavity field-fiber), the interaction between atoms and the non-resonant normal modes can be eliminated, simplifying our system to that of one atom interacting with a single-mode cavity. For this interaction, we have analyzed the entanglement between distant atoms. We present two simple procedures to generate two atoms in a maximally entangled state, interacting (i) successively and (ii) simultaneously with the coupled cavities system.
<p class="Resumo">Este estudo foi conduzido com o objetivo de avaliar o emprego de equações hipsométricas em cerrado <em>sensu stricto</em> focalizando o sistema de amostragem e o agrupamento dos dados de relação hipsométrica. Para isso, foram utilizadas 46 parcelas de 1.000 m² cada, onde 13 parcelas foram empregadas na simulação de seis diferentes sistemas de amostragem e na estratificação de dados para o ajuste de modelos hipsométricos. As 33 parcelas restantes foram reservadas para um teste de aplicação das equações hipsométricas geradas, onde, para decidir quanto ao modelo hipsométrico e sistema de amostragem, foram adotados os critérios estatísticos: erro padrão residual e correlação linear múltipla, além da análise da distribuição de resíduos. Após esta decisão, foi utilizado um teste de identidade de modelos para verificar a melhor forma de preparar a base de dados visando o ajuste de modelos hipsométricos. Concluiu-se que a relação funcional linear: Ln(h)=f[Ln(N); Ln(dq/d); 1/d] foi a mais adequada para caracterizar a relação hipsométrica em inventários florestais de cerrado sensu stricto e deve ser ajustada com dados obtidos nas 50 primeiras árvores de cada parcela, sem agrupamento por classe de diâmetro.</p>
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