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Title:
Non local interactions enhance the performances of quantum batteries : the case of SYK
Speaker:
Abstract:
In this talk, motivated by the growing interest in building devices based on quantum principles, we will introduce and characterize some novel models of quantum batteries. After an introduction to the notion of quantum battery, as a quantum mechanical system able to store and release energy, we will study how a quantum battery can be efficiently charged. In particular, we will focus on the so-called double sudden quench protocol. We will analyze the main universal and model-dependent features of the charging protocol, and we will show how strongly interacting quenches allow to improve drastically the charging performances. In this respect, we will propose a quench based on the SYK hamiltonian as an optimal choice. In the second part of the talk, we will focus on the problem of maximizing the portion of the energy usable for practical purposes. We will introduce the associated notion of ergotropy and we will show how high levels of entanglement can negatively affect the value of the ergotropy and thus the overall performance of the battery. Based on these findings, we will argue that in the double sudden quench protocol small quantum batteries, individually charged via a SYK-like quench, represent the optimal choice.
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