Zobrazeno 1 - 10
of 203
pro vyhledávání: '"O. Terra"'
In open quantum systems, entanglement can vanish faster than coherence. This phenomenon is usually called sudden death of entanglement. In [M. O. Terra Cunha, New J. Phys. 9, 237 (2007)] a geometrical explanation was offered and a classification of a
Externí odkaz:
http://arxiv.org/abs/0811.3344
Autor:
Cavalcanti, D., Saldanha, P. L., Cosme, O., Brandao, F. G. S. L., Monken, C. H., Padua, S., Santos, M. Franca, Cunha, M. O. Terra
Publikováno v:
Phys. Rev. A 78, 012318 (2008)
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 singular points at the border of the set of unentangled states appear as sin
Externí odkaz:
http://arxiv.org/abs/0709.0301
Publikováno v:
Phys. Rev. A 76, 042329 (2007)
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 superposition is given in terms of the entanglement of the superposed states and
Externí odkaz:
http://arxiv.org/abs/0705.2521
Autor:
Cunha, Marcelo O. Terra
Publikováno v:
New Journal of Physics 9 (2007) 237
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 is discussed from a geometrical point of view, in the context of two qu
Externí odkaz:
http://arxiv.org/abs/quant-ph/0703121
Autor:
Cavalcanti, Daniel, Moreira, L. M., Matinaga, Franklin, Cunha, Marcelo O. Terra, Santos, Marcelo Franca
Publikováno v:
Phys. Rev. B 76, 113304 (2007)
We address the question whether identical-particle entanglement is a useful resource for quantum information processing. We answer this question positively by reporting a scheme to create entanglement using semiconductor quantum wells. The Pauli excl
Externí odkaz:
http://arxiv.org/abs/quant-ph/0608141
Autor:
Cavalcanti, Daniel, Oliveira Jr, J. G., de Faria, J. G. Peixoto, Cunha, Marcelo O. Terra, Santos, Marcelo Franca
Publikováno v:
Phys. Rev. A 74, 042328 (2006)
We study the relation between energy and entanglement in an entanglement transfer problem. We first analyze the general setup of two entangled qubits (a and b) exchanging this entanglement with two other independent qubits (A and B). Qubit a (b) inte
Externí odkaz:
http://arxiv.org/abs/quant-ph/0608139
Autor:
Cunha, Marcelo O Terra, Vedral, Vlatko
Publikováno v:
Acta Physica Hungarica A 26, 261-268 (2006)
We review how to obtain spin entangled pairs of fermions from a Fermi gas. An experiment with neutrons is proposed in order to get such pairs.
Comment: Prepared for the Proceedings of Central European Workshop on Quantum Optics, Vienna - 2006
Comment: Prepared for the Proceedings of Central European Workshop on Quantum Optics, Vienna - 2006
Externí odkaz:
http://arxiv.org/abs/quant-ph/0607224
We address some of the most commonly raised questions about entanglement, especially with regard to so-called occupation number entanglement. To answer unambiguously whether entanglement can exist in a one-atom delocalized state, we propose an experi
Externí odkaz:
http://arxiv.org/abs/quant-ph/0606149
Publikováno v:
Appl. Phys. Lett. 89, 084102 (2006)
The experimental determination of entanglement is a major goal in the quantum information field. In general the knowledge of the state is required in order to quantify its entanglement. Here we express a lower bound to the robustness of entanglement
Externí odkaz:
http://arxiv.org/abs/quant-ph/0605155
Publikováno v:
New J. Phys. 8, 260 (2006)
By the topological argument that the identity matrix is surrounded by a set of separable states follows the result that if a system is entangled at thermal equilibrium for some temperature, then it presents a phase transition (PT) where entanglement
Externí odkaz:
http://arxiv.org/abs/quant-ph/0510132