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Protecting conditional quantum gates by robust dynamical decoupling.

Ch Piltz1, B Scharfenberger1, A Khromova1

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We demonstrate a robust two-qubit controlled-NOT gate using dynamical decoupling (DD) to overcome dephasing in quantum systems. This method protects quantum information, enabling high-fidelity quantum logic operations.

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Area of Science:

  • Quantum computing
  • Quantum information science
  • Atomic physics

Background:

  • Dephasing, the loss of quantum superposition, hinders high-fidelity quantum logic operations.
  • Quantum gates require precise control and are susceptible to environmental noise and control imperfections.

Purpose of the Study:

  • To implement a robust two-qubit controlled-NOT gate that overcomes dephasing.
  • To develop and test a novel concatenated dynamical decoupling (DD) sequence for quantum gate protection.

Main Methods:

  • Implementation of a two-qubit controlled-NOT gate using a concatenated DD sequence.
  • Experimental realization in a prototype quantum system of trapped atomic ions with spin-spin interaction.
  • Comparison of the concatenated DD sequence performance against three other DD sequences.

Main Results:

  • Successful implementation of a universal conditional quantum gate with extended gate times beyond the intrinsic coherence limit.
  • Demonstrated robustness of the concatenated DD sequence against DD pulse imperfections.
  • Experimental validation in a trapped ion system.

Conclusions:

  • The developed concatenated DD scheme effectively protects quantum information during gate operations, mitigating dephasing.
  • This approach is applicable to various quantum computing platforms, including NV centers, NMR, and circuit QED.
  • The findings pave the way for realizing high-fidelity quantum logic operations in noisy quantum systems.