11 research outputs found
Quantum erasure in the presence of a thermal bath: the effects of system-environment microscopic correlations
We investigate the role of the environment in a quantum erasure setup in the
cavity quantum electrodynamics domain. Two slightly different schemes are
analyzed. We show that the effects of the environment vary when a scheme is
exchanged for another. This can be used to estimate the macroscopic parameters
related to the system-environment microscopic correlations.Comment: 10 pages, 2 figure
Control of state and state entanglement with a single auxiliary subsystem
We present a strategy to control the evolution of a quantum system. The novel
aspect of this protocol is the use of a \emph{single auxiliary subsystem}. Two
applications are given, one which allows for state preservation and another
which controls the degree of entanglement of a given initial state
Classical and quantum coupled oscillators: symplectic structure
We consider a set of N linearly coupled harmonic oscillators and show that
the diagonalization of this problem can be put in geometrical terms. The matrix
techniques developed here allowed for solutions in both the classical and
quantum regimes.Comment: 27 pages, 6 figure
Coping with the Double Legacy of Authoritarianism and Revolution in Portuguese Democracy
Comparative research on democratisation suggests the political space for the immediate punishment of previous dictatorships depends on the type of transition and the correlative power-sharing and veto capacity of the political actors and institutions. This article argues that the type and diversity of transitional justice in Portugal's democratisation must be correlated not only with the absence of the veto capacity of former authoritarian elites and institutions, due to their collapse, but mainly with the cleavages opened by democratisation and military intervention in politics. We also argue that the nature of the transition is superimposed on the nature of the authoritarian regime and the extent of its legacy in the type of transitional justice, and that the transition's powerful dynamic served to constitute another legacy for the consolidation of democracy, strongly counterbalancing those of the authoritarian regime