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

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Demonstrates a two-qubit gate fidelity of 99.9(1)% for ⁴³Ca⁺ hyperfine qubits using a light-shift gate, the highest reported for any qubit platform at time of publication. Establishes trapped ions as the fidelity benchmark for two-qubit operations.

Key Results

  • Two-qubit gate fidelity: 99.9(1)% (randomized benchmarking)
  • Uses a geometric phase gate driven by off-resonant laser beams
  • Gate time: ~100 μs
  • Platform: ⁴³Ca⁺ ions in a macroscopic linear Paul trap

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