Reaching and violating thermodynamic uncertainty bounds in information engines

Abstract

Thermodynamic uncertainty relations (TURs) set fundamental bounds on the fluctuation and dissipation of stochastic systems. Here, we examine these bounds, in experiment and theory, by exploring the entire phase space of a cyclic information engine operating in a non-equilibrium steady state. Close to its maximal efficiency, we find that the engine violates the original TUR. This first experimental demonstration of TUR violation agrees with recently proposed softer bounds: The engine satisfies two generalized TUR bounds derived from the detailed fluctuation theorem with feedback control and another bound linking fluctuation and dissipation to mutual information and Renyi divergence. We examine how the interplay of work fluctuation and dissipation shapes the information conversion efficiency of the engine, and find that dissipation is minimal at a finite noise level, where the original TUR is violated.

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• Efficiency fluctuations and noise induced refrigerator-to-heater transition in information engines
• Thermodynamic uncertainty relation for energy transport in transient regime -- Model study
• Exploring quantum thermodynamics with NMR
• Transport and Diffusion Enhancement in Experimentally Realized Non-Gaussian Correlated Ratchets
• Colossal power extraction from active cyclic Brownian information engines
• Dynamical activity universally bounds precision of response in Markovian nonequilibrium systems
• Thermodynamic precision in the nonequilibrium exchange scenario
• Thermodynamics of multiple Maxwell demons
• Virial-like Thermodynamic Uncertainty Relation in the Tight-Binding Regime
• Violation of the thermodynamic uncertainty relation in quantum collisional models
• Memory-aware feedback enhances power in active information engines