Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Santos, M. Franca"'
Publikováno v:
Journal of Physics: Condensed Matter 28, 195602 (2016)
We study the nonequilibrium interplay between disorder and interactions in a closed quantum system. We base our analysis on the notion of dynamical state-space localization, calculated via the Loschmidt echo. Although real-space and state-space local
Externí odkaz:
http://arxiv.org/abs/1508.04436
Autor:
Mascarenhas, Eduardo, Valente, Daniel, Montangero, Simone, Auffeves, Alexia, Gerace, Dario, Santos, M. Franca
Publikováno v:
EPL 106, 54003 (2014)
Electronic diodes, which enable the rectification of an electrical energy flux, have played a crucial role in the development of current microelectronics after the invention of semiconductor p-n junctions. Analogously, signal rectification at specifi
Externí odkaz:
http://arxiv.org/abs/1307.6493
Autor:
Mascarenhas, E., Braganca, H., Dorner, R., Santos, M. Franca, Vedral, V., Modi, K., Goold, J.
Publikováno v:
Phys. Rev. E 89, 062103 (2014)
We study the physics of quantum phase transitions from the perspective of non-equilibrium thermodynamics. For first order quantum phase transitions, we find that the average work done per quench in crossing the critical point is discontinuous. This l
Externí odkaz:
http://arxiv.org/abs/1307.5544
Publikováno v:
Physical Review B 81, 245419 (2010)
The influence of pure dephasing on the dynamics of the coupling between a two-level atom and a cavity mode is systematically addressed. We have derived an effective atom-cavity coupling rate that is shown to be a key parameter in the physics of the p
Externí odkaz:
http://arxiv.org/abs/1002.3753
Publikováno v:
Phys. Rev. A 81, 032310 (2010)
We study how to protect quantum information in quantum systems subjected to local dissipation. We show that combining the use of three-level systems, environment monitoring, and local feedback can fully and deterministically protect any available qua
Externí odkaz:
http://arxiv.org/abs/1002.0436
Publikováno v:
Optics Communications 281 (2008) 4696
The dissipative dynamics of Gaussian squeezed states (GSS) and coherent superposition states (CSS) are analytically obtained and compared. Time scales for sustaining different quantum properties such as squeezing, negativity of the Wigner function or
Externí odkaz:
http://arxiv.org/abs/0710.5930
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 75, 062324 (2007)
Entanglement evolution in high dimensional bipartite systems under dissipation is studied. Discontinuities for the time derivative of the lower bound of entanglement of formation is found depending on the initial conditions for entangled states. This
Externí odkaz:
http://arxiv.org/abs/quant-ph/0702246
Publikováno v:
Phys. Rev. Lett. 98, 020401 (2007)
We present a method of measuring the quantum state of a harmonic oscillator through instantaneous probe-system selective interactions of the Jaynes-Cummings type. We prove that this scheme is robust to general decoherence mechanisms, allowing the pos
Externí odkaz:
http://arxiv.org/abs/quant-ph/0606004
Publikováno v:
Phys. Rev. A 73, 040305(R) (2006) (4 pages)
We propose a method for directly probing the dynamics of disentanglement of an initial two-qubit entangled state, under the action of a reservoir. We show that it is possible to detect disentanglement, for experimentally realizable examples of decayi
Externí odkaz:
http://arxiv.org/abs/quant-ph/0509204