Entanglement Structure of Non-Gaussian States and How to Measure It

Autor:	Froland, Henry, Zache, Torsten V., Ott, Robert, Mueller, Niklas
Rok vydání:	2024
Předmět:	Quantum Physics Condensed Matter - Quantum Gases High Energy Physics - Lattice
Druh dokumentu:	Working Paper
Popis:	Rapidly growing capabilities of quantum simulators to probe quantum many-body phenomena require new methods to characterize increasingly complex states. We present a protocol that constrains quantum states by experimentally measured correlation functions which only scales polynomially with system size. This method enables measurement of a quantum state's entanglement structure, opening a new route to study entanglement-related phenomena. Our approach extends Gaussian state parameterizations by systematically incorporating higher-order correlations. We show the protocol's usefulness in conjunction with current and forthcoming experimental capabilities, focusing on weakly interacting fermions as a proof of concept. Here, the lowest non-trivial expansion quantitatively predicts early time thermalization dynamics, including signaling the on-set of quantum chaos indicated by the entanglement Hamiltonian. Comment: 15 pages, 10 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2407.12083 Zobrazit plný text záznamu View this record from Arxiv