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High-Fidelity Quantum Logic Gates Using Trapped-Ion Hyperfine Qubits

C. J. Ballance, T. P. Harty, N. M. Linke, M. A. Sepiol, and D. M. Lucas
Phys. Rev. Lett. 117, 060504 – Published 4 August 2016
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Abstract

We demonstrate laser-driven two-qubit and single-qubit logic gates with respective fidelities 99.9(1)% and 99.9934(3)%, significantly above the 99% minimum threshold level required for fault-tolerant quantum computation, using qubits stored in hyperfine ground states of calcium-43 ions held in a room-temperature trap. We study the speed-fidelity trade-off for the two-qubit gate, for gate times between 3.8μs and 520μs, and develop a theoretical error model which is consistent with the data and which allows us to identify the principal technical sources of infidelity.

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  • Received 30 December 2015

DOI:https://doi.org/10.1103/PhysRevLett.117.060504

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

C. J. Ballance, T. P. Harty, N. M. Linke, M. A. Sepiol, and D. M. Lucas*

  • Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

  • *d.lucas@physics.ox.ac.uk

See Also

High-Fidelity Universal Gate Set for Be9+ Ion Qubits

J. P. Gaebler, T. R. Tan, Y. Lin, Y. Wan, R. Bowler, A. C. Keith, S. Glancy, K. Coakley, E. Knill, D. Leibfried, and D. J. Wineland
Phys. Rev. Lett. 117, 060505 (2016)

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Vol. 117, Iss. 6 — 5 August 2016

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