- Full text PDF available (23)
- This year (0)
- Last 5 years (1)
- Last 10 years (15)
Journals and Conferences
Bloch-vector spaces for N -level systems are investigated from the spherical-coordinate point of view in order to understand their geometrical aspects. We present a characterization of the space by… (More)
We provide a new class of positive maps in matrix algebras. The construction is based on the family of balls living in the space of density matrices of n-level quantum system. This class generalizes… (More)
We provide a partial classification of positive linear maps in matrix algebras which is based on a family of spectral conditions. This construction generalizes celebrated Choi example of a map which… (More)
We provide a new approach to open quantum systems which is based on the Feshbach projection method. Instead of looking for a master equation for the dynamical map acting in the space of density… (More)
We analyze non-Markovian evolution of open quantum systems. It is shown that any dynamical map representing the evolution of such a system may be described either by a nonlocal master equation with a… (More)
We construct a new class of positive indecomposable maps in the algebra of d × d complex matrices. Each map is uniquely characterized by a cyclic bistochastic matrix. This class generalizes a Choi… (More)
The relation between completely positive maps and compound states is investigated in terms of the notion of quantum conditional probability.
Using well known duality between quantum maps and states of composite systems we introduce the notion of Schmidt number of a quantum channel. It enables one to define classes of quantum channels… (More)
A class of linear positive, trace preserving maps in Mn is given in terms of affine maps in R n 2 −1 which map the closed unit ball into itself.