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Single-qubit quantum memory exceeding ten-minute coherence time

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Demonstrates single-qubit quantum memory with coherence time exceeding 10 minutes (>600 s) in ¹⁷¹Yb⁺ using sympathetic cooling with ¹³⁸Ba⁺ ions. The long coherence is achieved by operating on the ¹⁷¹Yb⁺ hyperfine clock transition, which is first-order insensitive to magnetic field fluctuations.

Key Results

  • T₂ > 600 s (10 minutes) for single ¹⁷¹Yb⁺ qubit
  • Sympathetic cooling with ¹³⁸Ba⁺ to suppress motional heating
  • Hyperfine clock transition encoding for magnetic field insensitivity

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