Qubit Zoo

High-Fidelity Universal Gate Set for ⁹Be⁺ Ion Qubits

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Demonstrates a universal gate set for ⁹Be⁺ hyperfine qubits with single-qubit gate fidelity of 99.9999% and two-qubit Mølmer-Sørensen gate fidelity of 99.9(1)%, both characterized by randomized benchmarking. Establishes the highest single-qubit gate fidelity for any platform.

Key Results

  • 1Q gate fidelity: 99.9999(1)% (randomized benchmarking)
  • 2Q MS gate fidelity: 99.9(1)%
  • Platform: ⁹Be⁺ hyperfine qubits in surface-electrode trap
  • Error dominated by spontaneous emission from Raman beams

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