Alessandra Colla
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View article: Local energy assignment for two interacting quantum thermal reservoirs
Local energy assignment for two interacting quantum thermal reservoirs Open
Understanding how to assign internal energy, heat, and work in quantum systems beyond weak coupling remains a central problem in quantum thermodynamics, particularly as the difference between competing definitions becomes increasingly rele…
View article: Local and global approaches to the thermodynamics of pure decoherence processes in open quantum systems
Local and global approaches to the thermodynamics of pure decoherence processes in open quantum systems Open
We study the nonequilibrium thermodynamics of pure decoherence processes in open quantum systems coupled to a thermal reservoir. We review various definitions of central quantities, such as internal energy, work, heat, and entropy producti…
View article: Local and global approaches to the thermodynamics of pure decoherence processes in open quantum systems
Local and global approaches to the thermodynamics of pure decoherence processes in open quantum systems Open
We study the nonequilibrium thermodynamics of pure decoherence processes in open quantum systems coupled to a thermal reservoir. We review various definitions of central quantities, such as internal energy, work, heat and entropy productio…
View article: Unveiling coherent dynamics in non-Markovian open quantum systems: exact expression and recursive perturbation expansion
Unveiling coherent dynamics in non-Markovian open quantum systems: exact expression and recursive perturbation expansion Open
We introduce a systematic framework to derive the effective Hamiltonian governing the coherent dynamics of non-Markovian open quantum systems. By applying the minimal dissipation principle, we uniquely isolate the coherent contribution to …
View article: Recursive perturbation approach to time-convolutionless master equations: Explicit construction of generalized Lindblad generators for arbitrary open systems
Recursive perturbation approach to time-convolutionless master equations: Explicit construction of generalized Lindblad generators for arbitrary open systems Open
We develop a recursive perturbative expansion for the time-convolutionless (TCL) generator of an open quantum system in a generalized Lindblad form. This formulation provides a systematic approach to derive the generator at arbitrary order…
View article: Observing time-dependent energy level renormalisation in an ultrastrongly coupled open system
Observing time-dependent energy level renormalisation in an ultrastrongly coupled open system Open
View article: Thermodynamic roles of quantum environments: from heat baths to work reservoirs
Thermodynamic roles of quantum environments: from heat baths to work reservoirs Open
Environments in quantum thermodynamics usually take the role of heat baths. These baths are Markovian, weakly coupled to the system, and initialized in a thermal state. Whenever one of these properties is missing, standard quantum thermody…
View article: Observing Time-Dependent Energy Level Renormalisation in an Ultrastrongly Coupled Open System
Observing Time-Dependent Energy Level Renormalisation in an Ultrastrongly Coupled Open System Open
Understanding how strong coupling and memory effects influence the energy levels of open quantum systems is a complex and challenging problem. Here, we show these effects by probing the transition frequency of an open two-level system with…
View article: Thermodynamic Roles of Quantum Environments: From Heat Baths to Work Reservoirs
Thermodynamic Roles of Quantum Environments: From Heat Baths to Work Reservoirs Open
Environments in quantum thermodynamics usually take the role of heat baths. These baths are Markovian, weakly coupled to the system, and initialized in a thermal state. Whenever one of these properties is missing, standard quantum thermody…
View article: Quantum thermodynamics of the spin-boson model using the principle of minimal dissipation
Quantum thermodynamics of the spin-boson model using the principle of minimal dissipation Open
A recently developed approach to the thermodynamics of open quantum systems, on the basis of the principle of minimal dissipation, is applied to the spin-boson model. Employing a numerically exact quantum dynamical treatment based on the h…
View article: Dynamically emergent quantum thermodynamics: Non-Markovian Otto cycle
Dynamically emergent quantum thermodynamics: Non-Markovian Otto cycle Open
Employing a recently developed approach to dynamically emergent quantum thermodynamics, we revisit the thermodynamic behavior of the quantum Otto cycle with a focus on memory effects and strong system-bath couplings. Our investigation is b…
View article: Dynamically Emergent Quantum Thermodynamics: Non-Markovian Otto Cycle
Dynamically Emergent Quantum Thermodynamics: Non-Markovian Otto Cycle Open
Employing a recently developed approach to dynamically emergent quantum thermodynamics, we revisit the thermodynamic behavior of the quantum Otto cycle with a focus on memory effects and strong system-bath couplings. Our investigation is b…
View article: Initial correlations in open quantum systems: constructing linear dynamical maps and master equations
Initial correlations in open quantum systems: constructing linear dynamical maps and master equations Open
We investigate the dynamics of open quantum systems which are initially correlated with their environment. The strategy of our approach is to analyze how given, fixed initial correlations modify the evolution of the open system with respec…
View article: Initial Correlations in Open Quantum Systems: Constructing Linear Dynamical Maps and Master Equations
Initial Correlations in Open Quantum Systems: Constructing Linear Dynamical Maps and Master Equations Open
We investigate the dynamics of open quantum systems which are initially correlated with their environment. The strategy of our approach is to analyze how given, fixed initial correlations modify the evolution of the open system with respec…
View article: Open-system approach to nonequilibrium quantum thermodynamics at arbitrary coupling
Open-system approach to nonequilibrium quantum thermodynamics at arbitrary coupling Open
We develop a general theory describing the thermodynamical behavior of open quantum systems coupled to thermal baths beyond perturbation theory. Our approach is based on the exact time-local quantum master equation for the reduced open sys…
View article: Entropy production and the role of correlations in quantum Brownian motion
Entropy production and the role of correlations in quantum Brownian motion Open
We perform a study on quantum entropy production, different kinds of correlations, and their interplay in the driven Caldeira-Leggett model of quantum Brownian motion. The model, taken with a large but finite number of bath modes, is exact…
View article: Exact Open System Approach to Strong Coupling Quantum Thermodynamics
Exact Open System Approach to Strong Coupling Quantum Thermodynamics Open
We develop a general theory describing the thermodynamical behavior of open quantum systems coupled to thermal baths beyond perturbation theory. Our approach is based on the exact time-local quantum master equation for the reduced open sys…
View article: Entropy Production and the Role of Correlations in Quantum Brownian Motion
Entropy Production and the Role of Correlations in Quantum Brownian Motion Open
We perform a study on quantum entropy production, different kinds of correlations, and their interplay in the driven Caldeira-Leggett model of quantum Brownian motion. The model, taken with a large but finite number of bath modes, is exact…
View article: Dynamics of Quantum Spin Chains
Dynamics of Quantum Spin Chains Open
In the present thesis we perform a step towards understanding the effec-
\ntiveness of Hamiltonian perturbation theory in quantum dynamics, which is made possible by the Hamiltonian framing of quantum mechanics. To such a purpose, we focus…