2017/12/22 by Norbert M. Linke, Sonika Johri, Caroline Figgatt +3 · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.98.052334
published as Phys. Rev. A 98, 052334 (2018) · main text: 5 pages, 4 figures, 2 F-H systems, 2 qubits each, 1 ancilla; supplementary material: 4 pages, 7 figures
arxiv created 2017/12/22 · arxiv updated 2018/12/05
The efficient simulation of correlated quantum systems is the most 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 5-qubit programmable quantum computer based on trapped ions. Our work illustrates the extraction of a non-linear 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.