An error-resilient gate search scheme using multi-objective optimization and pulse symmetries enables microsecond two-qubit gates with fidelities approaching 99.9% in linear ion traps of up to 50 ions.
High-Fidelity Universal Gate Set for $^9$Be$^+$ Ion Qubits
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abstract
We report high-fidelity laser-beam-induced quantum logic gates on magnetic-field-insensitive qubits comprised of hyperfine states in $^{9}$Be$^+$ ions with a memory coherence time of more than 1 s. We demonstrate single-qubit gates with error per gate of $3.8(1)\times 10^{-5}$. By creating a Bell state with a deterministic two-qubit gate, we deduce a gate error of $8(4)\times10^{-4}$. We characterize the errors in our implementation and discuss methods to further reduce imperfections towards values that are compatible with fault-tolerant processing at realistic overhead.
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Reviews paradigmatic entanglement quantifiers and state-of-the-art detection/certification methods, with emphasis on assumptions about states and measurements.
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Error-Resilient Fast Entangling Gates for Scalable Ion-Trap Quantum Processors
An error-resilient gate search scheme using multi-objective optimization and pulse symmetries enables microsecond two-qubit gates with fidelities approaching 99.9% in linear ion traps of up to 50 ions.
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Entanglement Certification $-$ From Theory to Experiment
Reviews paradigmatic entanglement quantifiers and state-of-the-art detection/certification methods, with emphasis on assumptions about states and measurements.