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This is foundational theory work on nonequilibrium quantum thermodynamics. It offers exact expressions for quantum subsystem averages and boundary conditions for how a small system affects large reservoirs, where earlier methods relied on approximations. Its practical value for quantum device modelling depends on computational efficiency for larger or more complex setups, which the authors flag as an open challenge.
Toronto Team Maps Entropy Production in Driven Quantum Subsystems
How do you accurately predict energy flow within nanoscale devices interacting with complex environments? A new framework delivers exact expressions for average values using local density operators, and crucially, derives how those tiny systems feed back into their surroundings via novel boundary conditions. This allows construction of an equation describing internal energy evolution subject to external driving, improving upon existing methods that often neglect environmental effects.
Reservoirs represent an important area of study. Local density operators function as functionals of constraint variables which serve as thermodynamic forces satisfying a set of equations of motion. The evolution of average internal energy within the quantum subsystem, potentially subject to external autonomous driving performing work on it, is a primary focus. Entropy production within the system also…
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