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Probing Qubit Memory Errors at the Part-per-Million Level.

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This summary is machine-generated.

This study demonstrates robust qubit memory essential for quantum computing. Researchers achieved a memory error rate below 10⁻⁴ for a trapped-ion qubit, crucial for building reliable quantum processors.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing Hardware

Background:

  • Robust qubit memory is critical for both near-term quantum devices and future fault-tolerant quantum computers.
  • Trapped-ion qubits are a leading platform for quantum information processing due to their long coherence times.

Purpose of the Study:

  • To directly measure the memory error rate (εm) of a 43Ca+ trapped-ion qubit.
  • To assess the qubit memory performance in the small-error regime for potential quantum computing applications.

Main Methods:

  • Direct measurement of memory error (εm) for a 43Ca+ trapped-ion qubit.
  • Utilizing randomized benchmarking techniques to quantify error rates at specific storage times.

Main Results:

  • Achieved a memory error rate εm < 10⁻⁴ for storage times up to approximately 50 milliseconds.
  • Measured εm = 1.2(7) × 10⁻⁶ at t = 1 ms, significantly lower than extrapolated values from T₂* time.
  • Identified atomic clock reference instability as a limiting factor for further error reduction.

Conclusions:

  • The demonstrated qubit memory performance is superior to gate and measurement fidelities by three orders of magnitude.
  • This high-fidelity qubit memory is a significant step towards building scalable and reliable quantum computers.
  • Further improvements in atomic clock stability are necessary to achieve even lower memory error rates.