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Multiple-pulse coherence enhancement of solid state spin qubits.

W M Witzel1, S Das Sarma

  • 1Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.

Physical Review Letters
|March 16, 2007
PubMed
Summary
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Researchers prolonged the spin coherence time of solid-state spin qubits using designed electron spin resonance pulse sequences. This technique enhances qubit performance in quantum computing architectures like GaAs quantum dots and Si:P by suppressing spin echo decay.

Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Quantum Computing

Background:

  • Localized electron spins in solids, or solid-state spin qubits, are crucial for quantum computing.
  • Their performance is limited by spin coherence time, which is affected by environmental noise.
  • Nuclear spin dynamics cause spectral diffusion, leading to spin echo decay and reduced coherence times.

Purpose of the Study:

  • To prolong the spin coherence time of solid-state spin qubits.
  • To suppress spin echo decay caused by nuclear spin flip-flop dynamics.
  • To enhance the performance of quantum computing architectures.

Main Methods:

  • Application of designed electron spin resonance (ESR) pulse sequences.
  • Utilizing multiple-pulse sequences analogous to the Carr-Purcell-Meiboom-Gill sequence.

Related Experiment Videos

  • Employing composite pulse sequences with an even number of pulses.

    • Main Results:

    • Demonstrated strong suppression of spin echo decay.
    • Achieved significant prolongation of spin coherence time, by factors of 4-10.
    • Successfully applied the method in GaAs quantum-dot and Si:P quantum computer architectures.

    Conclusions:

    • Designed ESR pulse sequences effectively prolong spin coherence time in solid-state spin qubits.
    • The developed multiple-pulse sequences offer a robust method to combat decoherence.
    • This advancement holds promise for improving the scalability and reliability of quantum computers.