Measurements in Many-Body Open Quantum Systems: Discrete Time Crystals and Quantum Batteries
This talk presents an overview of my PhD work on measurements in many-body open quantum systems, focusing on two main examples: discrete time crystals and quantum batteries. The common idea behind these two topics is that measurements are not only a way to extract information from a quantum system, but can also play an active role in understanding and exploiting its dynamics in the presence of dissipation.
In the first part, I discuss dissipative discrete time crystals, namely driven many-body systems that display a robust subharmonic response. I analyze their dynamical and thermodynamic behavior and show how projective measurements can be used to characterize the persistence of time-crystalline order, the formation of defects, and the emergence of temporal domains.
In the second part, I focus on quantum batteries, quantum systems designed to coherently store and release energy. In this context, I discuss how continuous monitoring of the environment gives access to conditional quantum trajectories and can increase the amount of extractable work. This enhancement is quantified through the "daemonic ergotropy" and is related to the information gained from the measurement record.
https://us06web.zoom.us/j/86143613108?pwd=m2FuQHno2LO09SpBrV7EoUnOK8wbHd.1
Contact details:
Luisa Toledo Tude Contact form