Abstract
AbstractIn this chapter, we derive a generalized second law with a quantum measurement and quantum feedback control [1, 2], which is the first main part of this thesis. Thermodynamics of feedback control has been studied for a long time in terms of Maxwell’s demon [3–7]. In fact, the demon can be formulated as a feedback controller acting on thermodynamic systems. Recently, this topic has attracted numerous attentions based on the advancements in nonequilibrium statistical mechanics and quantum information theory [1, 2, 8–21]. In Sect. 6.1, we derive the lower bound of the entropy difference by feedback control. Based on it, in Sect. 6.2, we derive a generalized second law of thermodynamics with feedback control. In Sect. 6.3, we discuss a generalized Szilard engine [22] that achieves the upper bound of the generalized second law.KeywordsFeedback ControlDensity OperatorHeat BathUnitary EvolutionThermodynamic CycleThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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