Geometrically induced singular behavior of entanglement

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
Rok vydání:	2007
Předmět:	Quantum Physics
Zdroj:	Phys. Rev. A 78, 012318 (2008)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevA.78.012318
Popis:	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 singularities in the dynamics of entanglement of smoothly varying quantum states. We illustrate this result by implementing a photonic parametric down conversion experiment. Moreover, this effect is connected to recently discovered singularities in condensed matter models. Comment: v2: 4 pags, 4 figs. A discussion before the proof of Proposition 1 and tomographic results were included, Propostion 2 was removed and the references were fixed
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0709.0301 Zobrazit plný text záznamu View this record from Arxiv