title: Experimental quantum simulation of entanglement in many-body systems.
abstract: We employ a nuclear magnetic resonance (NMR) quantum information processor to simulate the ground state of an XXZ spin chain and measure its NMR analog of entanglement, or pseudoentanglement. The observed pseudoentanglement for a small-size system already displays a singularity, a signature which is qualitatively similar to that in the thermodynamical limit across quantum phase transitions, including an infinite-order critical point. The experimental results illustrate a successful approach to investigate quantum correlations in many-body systems using quantum simulators.
authors.affiliation: Institute for Quantum Computing, Department of Physics, University of Waterloo, Ontario, Canada.
authors.forename: Jingfu
authors.initials: J
authors.lastname: Zhang
authors.forename: Tzu-Chieh
authors.initials: TC
authors.lastname: Wei
authors.forename: Raymond
authors.initials: R
authors.lastname: Laflamme