Zobrazeno 1 - 10
of 90
pro vyhledávání: '"Ferialdi, L."'
Autor:
Ferialdi, L., Diósi, L.
Publikováno v:
Phys. Rev. A 104, 052209 (2021)
Wick's theorem provides a connection between time ordered products of bosonic or fermionic fields, and their normal ordered counterparts. We consider a generic pair of operator orderings and we prove, by induction, the theorem that relates them. We n
Externí odkaz:
http://arxiv.org/abs/2110.02920
Autor:
Ferialdi, L.
Publikováno v:
Phys. Rev. A 95, 052109 (2017)
Caldeira and Leggett (CL) in a seminal paper derived a master equation describing Markovian Quantum Brownian motion. Such an equation suffered of not being completely positive, and many efforts have been made to solve this issue. We show that, when a
Externí odkaz:
http://arxiv.org/abs/1701.05024
Autor:
Ferialdi, L.
Publikováno v:
Phys. Rev. A 95, 020101 (2017); ibid. 95, 069908(E) (2017)
We provide the exact non-Markovian master equation for a two-level system interacting with a thermal bosonic bath, and we write the solution of such a master equation in terms of the Bloch vector. We show that previous approximated results are partic
Externí odkaz:
http://arxiv.org/abs/1609.00645
Autor:
Ferialdi, L.
Publikováno v:
Phys. Rev. Lett. 116, 120402 (2016)
Non-Markovian master equations describe general open quantum systems when no approximation is made. We provide the exact closed master equation for the class of Gaussian, completely positive, trace preserving, non-Markovian dynamics. This very genera
Externí odkaz:
http://arxiv.org/abs/1512.07244
Autor:
Ferialdi, L., Dürr, D.
Publikováno v:
J. Math. Phys. 57, 062101 (2016)
We study a harmonic system coupled to chain of first neighbor interacting oscillators. After deriving the exact dynamics of the system, we prove that one can effectively describe the exact dynamics by considering a suitable shorter chain. We provide
Externí odkaz:
http://arxiv.org/abs/1508.07860
Autor:
Ferialdi, L., Dürr, D.
We analyze a system coupled to a bath of independent harmonic oscillators. We transform the bath in chain structure by solving an inverse eigenvalue problem. We solve the equations of motion for the collective variables defined by this transformation
Externí odkaz:
http://arxiv.org/abs/1502.03668
Autor:
Bahrami, M., Donadi, S., Ferialdi, L., Bassi, A., Curceanu, C., Di Domenico, A., Hiesmayr, B. C.
Publikováno v:
Nature:Scientific Reports 3, 1952
Collapse models provide a theoretical framework for understanding how classical world emerges from quantum mechanics. Their dynamics preserves (practically) quantum linearity for microscopic systems, while it becomes strongly nonlinear when moving to
Externí odkaz:
http://arxiv.org/abs/1305.6168
Publikováno v:
Foundations of Physics 43, 1066-1089 (2013)
We compute the effect of collapse models on neutrino oscillations. The effect of the collapse is to modify the evolution of the `spatial' part of the wave function, which indirectly amounts to a change on the flavor components. In many respects, this
Externí odkaz:
http://arxiv.org/abs/1207.5997
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