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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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High fidelity quantum gates via dynamical decoupling.

Jacob R West1, Daniel A Lidar, Bryan H Fong

  • 1HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, California 90265, USA.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Quantum computers need to overcome decoherence. This study shows high fidelity quantum gates are achievable using quantum dynamical decoupling, significantly improving gate performance.

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Area of Science:

  • Quantum computing
  • Quantum information science
  • Quantum control

Background:

  • Quantum computation promises significant advancements but is hindered by decoherence.
  • Maintaining quantum coherence is crucial for reliable quantum gate operations.

Purpose of the Study:

  • To demonstrate the feasibility of high-fidelity quantum gates.
  • To explore the effectiveness of quantum dynamical decoupling in mitigating decoherence.

Main Methods:

  • Numerical simulations were employed to assess gate fidelities.
  • Dynamical decoupling pulse sequences, including recursively constructed ones, were utilized.
  • The framework of quantum dynamical decoupling was applied.

Main Results:

  • Orders of magnitude improvement in quantum gate fidelities were achieved compared to unprotected evolution.
  • High fidelity quantum gates were shown to be possible.
  • The method proved effective over a broad range of system-environment coupling strengths.

Conclusions:

  • Quantum dynamical decoupling offers a viable strategy for realizing high-fidelity quantum gates.
  • The proposed method enhances the robustness of quantum computations against environmental noise.
  • This work advances the practical implementation of quantum computers.