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Long-lived qubit memory using atomic ions.

C Langer1, R Ozeri, J D Jost

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA. clanger@boulder.nist.gov

Physical Review Letters
|August 11, 2005
PubMed
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Researchers developed a robust quantum memory using beryllium ion qubits. This new method significantly enhances qubit coherence times, improving data storage stability for quantum computing applications.

Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Quantum memories are crucial for quantum computation and communication.
  • Previous experiments with 9Be+ atomic ion qubits faced limitations in coherence times.
  • Developing stable qubits is essential for advancing quantum technologies.

Purpose of the Study:

  • To demonstrate a robust quantum memory with extended coherence times.
  • To investigate the performance of magnetic-field-independent hyperfine transitions in 9Be+ qubits.
  • To compare the coherence properties of single physical qubits and decoherence-free subspace logical qubits.

Main Methods:

  • Utilizing a magnetic-field-independent hyperfine transition in 9Be+ atomic ion qubits.
  • Operating at a specific magnetic field (B ≈ 0.01194 T).

Related Experiment Videos

  • Experimentally measuring coherence times for both single physical qubits and two-qubit logical qubits.

    • Main Results:

    • Achieved a single physical qubit memory coherence time exceeding 10 seconds.
    • Demonstrated a coherence time improvement of approximately 5 orders of magnitude compared to previous 9Be+ experiments.
    • Observed long coherence times for decoherence-free subspace logical qubits.

    Conclusions:

    • The demonstrated quantum memory offers a significant improvement in coherence time, making it robust.
    • Magnetic-field-independent transitions are a promising avenue for stable quantum memory development.
    • Both single physical qubits and logical qubits show potential, with distinct merits for different quantum applications.