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Single ion qubit with estimated coherence time exceeding one hour.

Pengfei Wang1, Chun-Yang Luan2, Mu Qiao2

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Researchers achieved a quantum memory coherence time of 5500 seconds using a ytterbium-171 ion qubit. This significant advancement overcomes previous limitations, paving the way for practical quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Achieving long coherence times in quantum memory is crucial for quantum technology.
  • Previous record was 660 seconds for a single 171-ytterbium ion qubit, limited by heating and magnetic field fluctuations.

Purpose of the Study:

  • Identify and suppress factors limiting quantum memory coherence time.
  • Demonstrate significantly enhanced coherence times in a 171-ytterbium ion qubit.

Main Methods:

  • Suppressed magnetic field fluctuations, microwave reference oscillator instability, and leakage.
  • Utilized quantum process tomography to study decoherence.
  • Applied resource theories of quantum memory and coherence for analysis.

Main Results:

  • Achieved a coherence time of approximately 5500 seconds for the 171-ytterbium ion qubit.
  • Observed coherence times up to 960 seconds, with the fit indicating 5500 seconds.
  • Systematically analyzed decoherence processes.

Conclusions:

  • Overcame key limitations in quantum memory coherence.
  • Experimental demonstration accelerates practical applications of quantum memories.
  • Significant progress for noisy-intermediate-scale quantum (NISQ) applications.