Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Cucchietti, F. M."'
Publikováno v:
Phys. Rev. Lett. 105, 240406 (2010)
Geometric phases, arising from cyclic evolutions in a curved parameter space, appear in a wealth of physical settings. Recently, and largely motivated by the need of an experimentally realistic definition for quantum computing applications, the quant
Externí odkaz:
http://arxiv.org/abs/1006.1468
Publikováno v:
Lecture Notes in Physics 843, 245-294 (2012)
The quantum information approach to many body physics has been very successful in giving new insight and novel numerical methods. In these lecture notes we take a vertical view of the subject, starting from general concepts and at each step delving i
Externí odkaz:
http://arxiv.org/abs/1003.3153
Publikováno v:
New Journal of Physics 12, 025021 (2010)
We introduce a quantum generalization of classical kinetic Ising models, described by a certain class of quantum many body master equations. Similarly to kinetic Ising models with detailed balance that are equivalent to certain Hamiltonian systems, o
Externí odkaz:
http://arxiv.org/abs/0911.0624
Publikováno v:
Phys. Rev. A 81, 052318 (2010)
Quantum discord quantifies non-classical correlations in a quantum system including those not captured by entanglement. Thus, only states with zero discord exhibit strictly classical correlations. We prove that these states are negligible in the whol
Externí odkaz:
http://arxiv.org/abs/0908.3157
Autor:
Quan, H. T., Cucchietti, F. M.
Publikováno v:
Phys. Rev. E 79, 031101 (2009)
We study the quantum fidelity approach to characterize thermal phase transitions. Specifically, we focus on the mixed-state fidelity induced by a perturbation in temperature. We consider the behavior of fidelity in two types of second-order thermal p
Externí odkaz:
http://arxiv.org/abs/0806.4633
Publikováno v:
Acta Physica Polonica B, 38, No. 5 (2007), 1685
We examine an exactly solvable model of decoherence -- a spin-system interacting with a collection of environment spins. We show that in this simple model (introduced some time ago to illustrate environment--induced superselection) generic assumption
Externí odkaz:
http://arxiv.org/abs/quant-ph/0611200
Publikováno v:
Phys. Rev. A 72, 052113 (2005)
We examine two exactly solvable models of decoherence -- a central spin-system, (i) with and (ii) without a self--Hamiltonian, interacting with a collection of environment spins. In the absence of a self--Hamiltonian we show that in this model (intro
Externí odkaz:
http://arxiv.org/abs/quant-ph/0508184
We examine an exactly solvable model of decoherence - a spin-system interacting with a collection of environment spins. We show that in this model (introduced some time ago to illustrate environment-induced superselection) generic assumptions about t
Externí odkaz:
http://arxiv.org/abs/quant-ph/0312207
Publikováno v:
Phys. Rev. Lett. 91, 210403 (2003).
Environment--induced decoherence causes entropy increase. It can be quantified using, e.g., the purity $\varsigma={\rm Tr}\rho^2$. When the Hamiltonian of a quantum system is perturbed, its sensitivity to such perturbation can be measured by the Losc
Externí odkaz:
http://arxiv.org/abs/quant-ph/0306142
Publikováno v:
Phys. Rev. E 65, 046209 (2002)
We study the time evolution of two wave packets prepared at the same initial state, but evolving under slightly different Hamiltonians. For chaotic systems, we determine the circumstances that lead to an exponential decay with time of the wave packet
Externí odkaz:
http://arxiv.org/abs/nlin/0112015