| Texto completo | |
| Autor(es): |
Bittencourt, Victor A. S. V.
;
Bernardini, Alex E.
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS; v. 50, n. 7 APR 14 2017. |
| Citações Web of Science: | 3 |
| Resumo | |
Disentanglement and loss of quantum correlations due to one global collective noise effect are described for two-qubit Schrodinger cat and Werner states of a four level trapped ion quantum system. Once the Jaynes-Cummings ionic interactions are mapped onto a Dirac spinor structure, the elementary tools for computing quantum correlations of two-qubit ionic states are provided. With two-qubit quantum numbers related to the total angular momentum and to its projection onto the direction of an external magnetic field (which lifts the degeneracy of the ion's internal levels), a complete analytical profile of entanglement for the Schrodinger cat and Werner states is obtained. Under vacuum noise (during spontaneous emission), the two-qubit entanglement in the Schrodinger cat states is shown to vanish asymptotically. Otherwise, the robustness of Werner states is concomitantly identified, with the entanglement content recovered by their noiseless-like evolution. Most importantly, our results point to a firstly reported sudden transition between classical and quantum decay regimes driven by a classical collective noise on the Schrodinger cat states, which has been quantified by the geometric discord. (AU) | |
| Processo FAPESP: | 15/05903-4 - Emaranhamento de estruturas de bi-espinores no SU(2) x SU(2) e correlações quânticas adicionais exibidas por sistemas tipo-Dirac como grafeno e íons aprisionados |
| Beneficiário: | Alex Eduardo de Bernardini |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |