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

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 ro...

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Bibliographic Details
Published in:Physical review letters 2016-08, Vol.117 (6), p.060504-060504, Article 060504
Main Authors: Ballance, C J, Harty, T P, Linke, N M, Sepiol, M A, Lucas, D M
Format: Article
Language:English
Subjects:
Approximation
Error analysis
Fault tolerance
Gates
Logic circuits
Permissible error
Qubits (quantum computing)
Tradeoffs
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Summary: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 3.8  μs and 520  μs, and develop a theoretical error model which is consistent with the data and which allows us to identify the principal technical sources of infidelity.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.117.060504