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Measuring the Renyi entropy of a two-site Fermi-Hubbard model on a trapped ion quantum computer

TitleMeasuring the Renyi entropy of a two-site Fermi-Hubbard model on a trapped ion quantum computer
Publication TypeJournal Article
Year of Publication2018
AuthorsN.. M. Linke, S.. Johri, C.. Figgatt, K.. A. Landsman, A.. Y. Matsuura, and C.. Monroe
JournalPHYSICAL REVIEW A
Volume98
Pagination052334
Date PublishedNOV 26
ISSN2469-9926
Abstract

The efficient simulation of correlated quantum systems is a promising near-term application of quantum computers. Here, we present a measurement of the second Renyi entropy of the ground state of the two-site Fermi-Hubbard model on a five-qubit programmable quantum computer based on trapped ions. Our work illustrates the extraction of a nonlinear characteristic of a quantum state using a controlled-swap gate acting on two copies of the state. This scalable measurement of entanglement on a universal quantum computer will, with more qubits, provide insights into many-body quantum systems that are impossible to simulate on classical computers.

DOI10.1103/PhysRevA.98.052334