17 citations · 54 across the 11 of their papers we have counts for
11 papers
Squeezing as a probe of the universality hypothesis
P. A. L. Mourão, H. A. S. Costa, P. R. S. Carvalho
We compute analytically the radiative quantum corrections, up to next-to-leading loop order, to the universal critical exponents for both massless and massive O() scala…
Parameter estimation in an anisotropic expanding spacetime
O. P. de Sá Neto, I. G. da Paz, P. R. S. Carvalho +1
In this work, we investigate how the anisotropy affects the cosmological parameters estimation. Here the anisotropy is incorporated as a small gravitational disturbance. We calcula…
Temperature estimation of an entangled pair of trapped ions
O. P. de Sá Neto, H. A. S. Costa, G. A. Prataviera +1
We apply estimation theory to a system formed by two interacting trapped ions. By using the Fisher matrix formalism, we introduce a simple scheme for estimation of the temperature…
Diffeomorphism symmetry effect on the O(N ) universality class
H. A. S. Costa, P. R. S. Carvalho
We probe the effect of diffeomorphism symmetry on the critical exponents values for massive O() scalar field theories in curved spacetime. We apply field-theoretic reno…
Influence of conformal symmetry on the amplitude ratios for O() models
H. A. S. Costa, P. R. S. Carvalho
In this Letter we compute analytically the effect of conformal symmetry on the radiative corrections to the amplitude ratios for O() massless scalar field theories in c…
Decoherence of a uniformly accelerated finite-time detector
Helder A. S. Costa
We study a uniformly accelerated detector coupled to a massless scalar field for a finite time interval. By considering the detector initially prepared in a superposition state, qu…
Ramsey interferometry as a witness of acceleration radiation
Helder A. S. Costa, Irismar G. da Paz, Paulo R. S. Carvalho +1
We adapt a typical Ramsey interferometer by inserting a linear accelerator capable of accelerating an atom inside a single-mode cavity. We demonstrate that this simple scheme allow…
NLO critical exponents of O() lambda scalar field theories in curved spacetime
H. A. S. Costa, P. R. S. Carvalho
In this paper we investigate analytically the conformal symmetry influence on the next-to-leading order radiative quantum corrections to critical exponents for massless O() $λϕ^…
Measuring a QED cross section via a witness particle
Jonas B. Araujo, B. Hiller, I. G. da Paz +2
We consider a QED scattering (), in which is initially entangled with a third particle () that does not participate directly in the scattering. The effect…
Interacting fermions in an expanding spacetime
L. N. Machado, H. A. S. Costa, I. G. da Paz +2
We evaluate the effect of quantum electrodynamics on the correlations between Dirac field modes corresponding electron-positron pairs of opposite momenta generated by expansion of…
Parameter estimation for a Lorentz invariance violation
H. A. S. Costa, P. R. S. Carvalho, I. G. da Paz
We employ techniques from quantum estimation theory (QET) to estimate the Lorentz violation parameters in the 1+3-dimensional flat spacetime. We obtain and discuss the expression o…