5 research outputs found
Asymptotic equivalence of a subclass of WCLT non degenerate GKSL generator
We prove the assymptotic equivalence of a sequence of block diagonal matrices
with Toeplitz blocks. The blocks are the principal submatrices of an
originating Toeplitz sequence with generating symbol of the Wiener class. As an
application, using the invariance of certain \textit{diagonal} and
\textit{cyclic-diagonal} operator subspaces of the GKSL generators of circulant
and WCLT quantum Markov semigroups, the asymptotic equivalence of the families
is proved under suitable hypothesis
The fast recurrent subspace on an -level quantum energy transport model
The fast recurrent subspace (the biggest support of all invariant states) of
a Weak Coupling Limit Type Quantum Markov Semigroup modeling a quantum
transport open system of -energy levels is determined. This is achieved by
characterizing the structure of all the invariant state and their spectra in
terms of a natural generalization of the Discrete Fourier Transform operator.
Finally, the attraction domains and long-time behavior of the evolution are
studied on hereditary subalgebras where faithful invariant states exist.Comment: 25 page
A Characterization of Quantum Gaussian States in Terms of Annihilation Moments
We give a rigorous definition of moments of an unbounded observable with
respect to a quantum state in terms of Yosida's approximations of unbounded
generators of contractions semigroups. We use this notion to characterize
Gaussian states in terms of annihilation moments. As a by-product, rigorous
formulae for the mean value vector and the covariance matrix of a Gaussian
state are obtained