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Protected quantum computing: interleaving gate operations with dynamical decoupling sequences.

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This summary is machine-generated.

We developed a new method to protect quantum computations from environmental noise using dynamical decoupling. This technique significantly extends the time for accurate quantum gate operations on electron-spin qubits.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Error Correction

Background:

  • Quantum systems are highly sensitive to environmental noise, posing a major challenge for building reliable quantum devices.
  • Dynamical decoupling is a technique used to mitigate noise, but its application to quantum gate operations beyond quantum memory has been limited.

Purpose of the Study:

  • To demonstrate a general scheme for integrating dynamical decoupling with quantum logical gate operations.
  • To enhance the robustness of quantum computations against environmental noise.

Main Methods:

  • Experimental implementation of a combined dynamical decoupling and quantum gate operation scheme.
  • Utilizing an electron-spin qubit of a single nitrogen-vacancy center in diamond as the quantum system.
  • Characterization of gate performance and fidelity.

Main Results:

  • Achieved process fidelities greater than 98% for quantum logical gate operations.
  • Extended gate operation times by two orders of magnitude compared to the unprotected dephasing time (T2).
  • Demonstrated the general applicability of the scheme for quantum gate operations.

Conclusions:

  • The developed scheme effectively combines dynamical decoupling with quantum gate operations, significantly improving their performance in noisy environments.
  • This approach offers a promising pathway for building more robust and scalable quantum computers.
  • The method is applicable to various quantum systems and gate operations.