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View article: Classical pair of states as optimal pair for quantum distinguishability quantifiers
Classical pair of states as optimal pair for quantum distinguishability quantifiers Open
The capability to quantitatively distinguish quantum states is of great importance for a variety of tasks, and has recently played an important role in the study of quantum reduced dynamics and their characterization in terms of memory eff…
View article: Quantum Information Concepts in Open Quantum Systems
Quantum Information Concepts in Open Quantum Systems Open
This issue contains contributions in different cutting edge topics within the field of open quantum systems. The theoretical work presented is focused, in particular, on quantum thermodynamics and quantum non-Markovianity and provides a wi…
View article: Non-Markovian dynamics under time-translation symmetry
Non-Markovian dynamics under time-translation symmetry Open
A dynamical symmetry is employed to determine the structure of the quantum\nnon-Markovian time-local master equation. Such a structure is composed from two\ncomponents: scalar kinetic coefficients and the standard quantum Markovian\noperat…
View article: On the use of total state decompositions for the study of reduced dynamics
On the use of total state decompositions for the study of reduced dynamics Open
The description of the dynamics of an open quantum system in the presence of initial correlations with the environment needs different mathematical tools than the standard approach to reduced dynamics, which is based on the use of a time-d…
View article: Holevo skew divergence for the characterization of information backflow
Holevo skew divergence for the characterization of information backflow Open
The interpretation of non-Markovian effects as due to the information exchange between an open quantum system and its environment has been recently formulated in terms of properly regularized entropic quantities, as their revivals in time …
View article: On the Use of Total State Decompositions for the Study of Reduced Dynamics
On the Use of Total State Decompositions for the Study of Reduced Dynamics Open
The description of the dynamics of an open quantum system in the presence of initial correlations with the environment needs different mathematical tools than the standard approach to reduced dynamics, which is based on the use of a time-d…
View article: Correlations, Information Backflow, and Objectivity in a Class of Pure Dephasing Models
Correlations, Information Backflow, and Objectivity in a Class of Pure Dephasing Models Open
We critically examine the role that correlations established between a system and fragments of its environment play in characterising the ensuing dynamics. We employ a dephasing model with different initial conditions, where the state of t…
View article: Holevo skew divergence for the characterization of information backflow
Holevo skew divergence for the characterization of information backflow Open
The interpretation of non-Markovian effects as due to the information exchange between an open quantum system and its environment has been recently formulated in terms of properly regularized entropic quantities, as their revivals in time …
View article: Adapted projection operator technique for the treatment of initial correlations
Adapted projection operator technique for the treatment of initial correlations Open
The standard theoretical descriptions of the dynamics of open quantum systems rely on the assumption that the correlations with the environment can be neglected at some reference (initial) time. While being reasonable in specific instances…
View article: Adapted projection operator technique for the treatment of initial correlations
Adapted projection operator technique for the treatment of initial correlations Open
The standard theoretical descriptions of the dynamics of open quantum systems rely on the assumption that the correlations with the environment can be neglected at some reference (initial) time. While being reasonable in specific instances…
View article: Memory Effects in Quantum Dynamics Modelled by Quantum Renewal Processes
Memory Effects in Quantum Dynamics Modelled by Quantum Renewal Processes Open
Simple, controllable models play an important role in learning how to manipulate and control quantum resources. We focus here on quantum non-Markovianity and model the evolution of open quantum systems by quantum renewal processes. This cl…
View article: Entropic Bounds on Information Backflow
Entropic Bounds on Information Backflow Open
In the dynamics of open quantum systems, the backflow of information to the reduced system under study has been suggested as the actual physical mechanism inducing memory and thus leading to non-Markovian quantum dynamics. To this aim, the…
View article: Non-Markovian dynamics under time-translation symmetry
Non-Markovian dynamics under time-translation symmetry Open
A dynamical symmetry is employed to determine the structure of the quantum non-Markovian time-local master equation. Such a structure is composed from two components: scalar kinetic coefficients and the standard quantum Markovian operator …
View article: Continuous quantum measurement for general Gaussian unravelings can exist
Continuous quantum measurement for general Gaussian unravelings can exist Open
Quantum measurements and the associated state changes are properly described\nin the language of instruments. We investigate the properties of a time\ncontinuous family of instruments associated with the recently introduced family\nof gene…
View article: Parametrization and Optimization of Gaussian Non-Markovian Unravelings for Open Quantum Dynamics
Parametrization and Optimization of Gaussian Non-Markovian Unravelings for Open Quantum Dynamics Open
We derive a family of Gaussian non-Markovian stochastic Schrödinger equations for the dynamics of open quantum systems. The different unravelings correspond to different choices of squeezed coherent states, reflecting different measurement…
View article: Eternal non-Markovianity: from random unitary to Markov chain realisations
Eternal non-Markovianity: from random unitary to Markov chain realisations Open
View article: Non-Markovianity and the physics of memory: Be careful with master equations
Non-Markovianity and the physics of memory: Be careful with master equations Open
The theoretical description of quantum dynamics in an intriguing way does not necessarily imply the underlying dynamics is indeed intriguing. Here we show how a known very interesting master equation with an always negative decay rate [ete…