2019/05/31 by Ahmed Omran, Harry Levine, Alexander Keesling +16 · 4 citations
Physics and Astronomy · #cond-mat.quant-gas #physics.atom-ph #quant-ph
paper · pdf · doi:10.1126/science.aax9743
published as Science 365, 570-574 (2019) · 6 pages, 4 figures + Supplementary Materials (8 pages, 9 figures, 1 table)
arxiv created 2019/08/09 · arxiv updated 2019/08/13
Quantum entanglement involving coherent superpositions of macroscopically distinct states is among the most striking features of quantum theory, but its realization is challenging, since such states are extremely fragile. Using a programmable quantum simulator based on neutral atom arrays with interactions mediated by Rydberg states, we demonstrate the deterministic generation of 'Schrödinger cat' states of the Greenberger-Horne-Zeilinger (GHZ) type with up to 20 qubits. Our approach is based on engineering the energy spectrum and using optimal control of the many-body system. We further demonstrate entanglement manipulation by using GHZ states to distribute entanglement to distant sites in the array, establishing important ingredients for quantum information processing and quantum metrology.