First Law of Quantum Thermodynamics in a Driven Open Two-Level System
arXiv:2104.10691 · doi:10.1103/PhysRevA.104.022219
Abstract
Assigning the variations of internal energy into heat or work contributions is a challenging task due to the fact that these properties are trajectory dependent. A number of proposals have been put forward for open quantum systems following an arbitrary dynamics. We here focus on non-equilibrium thermodynamics of a two-level system and explore, in addition to the conventional approach, two definitions motivated by either classical work or heat, in which the driving Hamiltonian or the trajectory itself are respectively used to set up a reference basis. We first give the thermodynamic properties for an arbitrary dynamics and illustrate the results on the Bloch sphere. Then, we solve the particular example of a periodically driven qubit interacting with a dissipative and decoherence bath. Our results illustrate the trajectory-dependent character of heat and work, and how contributions originally assigned to dissipation in the Lindblad equation can become coherent part assigned to work.
arXiv comment5+4 pp, 4+4 figures, revised manuscript
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