Correlations as a Resource in Single-Shot Quantum Thermodynamics
July 12th, 2019 FEDERICO CERISOLA Universidad de Buenos Aires

The presence of correlations in physical systems can be a valuable resource for many quantum information tasks. Furthermore correlations are typically also relevant in thermodynamic transformations. In fact, usually the creation of correlations in a system is associated to some energetic cost. In this talk I will discuss the role of correlations as a resource in the thermodynamic process of state formation in the single-shot regime, that is in the study of the energetic cost of deterministically creating an arbitrary non-equilibrium target state via thermodynamic operations. I will show how in this single-shot regime the energetic cost of creating multiple copies of a given state can be reduced by allowing correlations in the final state. Moreover, we can analytically obtain the minimum cost for every finite number of subsystems, and furthermore show that this feature is not restricted to the case of copies but can be readily extended to the creation of many possibly different subsystems, where the total cost is reduced by acting globally and generating correlations between subsystems, instead of creating each one individually. Additionally, we demonstrate that in the asymptotic limit, by allowing an amount of correlations that only scales logarithmically with the number of subsystems, we can recover standard thermodynamic results where the free energy quantifies the minimum energetic cost of state formation. In this way we identify in the internal correlations among subsystems a possible physical mechanism responsible for a smooth transition from the intrinsically irreversible single-shot regime to the well known standard reversible thermodynamic results.

Seminar, July 12, 2019, 12:00. ICFO’s Seminar Room

Hosted by Prof. Antonio Acín