High-fidelity control and entanglement of Rydberg atom qubits
Individual neutral atoms excited to Rydberg states are a promising platform for quantum simulation and quantum information processing. However, experimental progress to date has been limited by short coherence times and relatively low gate fidelities associated with such Rydberg excitations. We report progress towards high-fidelity quantum control of Rydberg-atom qubits. Enabled by a reduction in laser phase noise, our approach yields a significant improvement in coherence properties of individual qubits. We further show that this high-fidelity control extends to the multi-particle case by preparing a two-atom entangled state with a fidelity exceeding 0.97(3), and extending its lifetime with a two-atom dynamical decoupling protocol. These advances open up new prospects for scalable quantum simulation and quantum computation with neutral atoms.
© 2018 American Physical Society. Received 12 June 2018; published 20 September 2018. We acknowledge A. Browaeys, M. Saffman, G. Biedermann, and their groups for many fruitful discussions during the Institute for Theoretical Atomic, Molecular, and Optical Physics (ITAMP) workshop, which stimulated this study. We also thank J. Ye and T. Lahaye for many useful discussions and suggestions. This work was supported by National Science Foundation (NSF), Center for Ultracold Atoms (CUA), Army Research Office (ARO), Air Force Office of Scientific Research Multidisciplinary Research Program of the University Research Initiative (AFOSR MURI), and the Vannevar Bush Faculty Fellowship. H.L. acknowledges support from the National Defense Science and Engineering Graduate (NDSEG) fellowship. A. O. acknowledges support by a research fellowship from the German Research Foundation (DFG). S. S. acknowledges funding from the European Union under the Marie Skłodowska Curie Individual Fellowship Programme H2020-MSCA-IF-2014 (Project No. 658253).
Submitted - 1806.04682.pdf
Published - PhysRevLett.121.123603.pdf
Supplemental Material - coherence_si.pdf