248 citations
- Federal University of São João del-ReiBR1 paper
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17 papers · 1 filter
Generating mixtures of spatial qubits
G. Lima, F. A. Torres-Ruiz, L. Neves +3
In a recent letter [Phys. Rev. Lett. 94, 100501 (2005)], we presented a scheme for generating pure entangled states of spatial qudits (-dimensional quantum systems) by using the…
Geometrically induced singular behavior of entanglement
D. Cavalcanti, P. L. Saldanha, O. Cosme +5
We show that the geometry of the set of quantum states plays a crucial role in the behavior of entanglement in different physical systems. More specifically it is shown that singul…
Characteristic Time and Maximum Mixedness: Single Mode Gaussian States in Dissipative Channels
Leonardo A. M. Souza, M. C. Nemes
We derive an upper limit for the mixedness of single bosonic mode gaussian states propagating in dissipative channels. It is a function of the initial squeezing and temperature of…
Multipartite entanglement of superpositions
D. Cavalcanti, M. O. Terra Cunha, A. Acin
The entanglement of superpositions [Phys. Rev. Lett. 97, 100502 (2006)] is generalized to the multipartite scenario: an upper bound to the multipartite entanglement of a superposit…
An analytical relation between entropy production and quantum Lyapunov exponents for Gaussian bipartite systems
K. M. Fonseca Romero, J. E. Parreira, L. A. M. Souza +2
We study and compare the information loss of a large class of Gaussian bipartite systems. It includes the usual Caldeira-Leggett type model as well as Anosov models (parametric osc…
The Geometry of Entanglement Sudden Death
Marcelo O. Terra Cunha
In open quantum systems, entanglement can vanish faster than coherence. This phenomenon is usually called sudden death of entanglement. In this paper sudden death of entanglement i…