Quantum Fisher Information for Different States and Processes in Quantum Chaotic Systems

Autor:	Iniguez, Fernando, Srednicki, Mark
Rok vydání:	2023
Předmět:	Condensed Matter - Statistical Mechanics Quantum Physics
Druh dokumentu:	Working Paper
Popis:	The quantum Fisher information (QFI) associated with a particular process applied to a many-body quantum system has been suggested as a diagnostic for the nature of the system's quantum state, e.g., a thermal density matrix vs. a pure state in a system that obeys the eigenstate thermalization hypothesis (ETH). We compute the QFI for both an energy eigenstate and a thermal density matrix for a variety of processes in a system obeying ETH, including a change in the hamiltonian that is either sudden (a quench), slow (adiabatic), or followed by contact with a heat bath. We compare our results with earlier results for a local unitary transformation. Comment: 8 pages, no figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2304.01657 Zobrazit plný text záznamu View this record from Arxiv