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Area of Science:

  • Quantum Computing
  • Quantum Error Correction

Background:

  • Quantum computing's viability depends on protecting quantum states from environmental errors.
  • Quantum error correction (QEC) is essential for identifying and correcting errors in qubits.
  • Scaling quantum systems requires robust error suppression to prevent logical failures.

Purpose of the Study:

  • To demonstrate the protection of classical states from environmental bit-flip errors.
  • To show the suppression of these errors with increasing system size using QEC.
  • To verify the preservation of non-classical states.

Main Methods:

  • Utilized a linear array of nine qubits as a step towards 2D surface code QEC.
  • Employed projective quantum non-demolition parity measurements to track errors.
  • Performed tomographic verification of Greenberger-Horne-Zeilinger state preservation.

Main Results:

  • Reduced failure rate in retrieving an input state by a factor of 2.7 using five qubits.
  • Achieved an 8.5-fold reduction in failure rate using nine qubits after eight cycles.
  • Successfully verified the preservation of non-classical states.

Conclusions:

  • Demonstrated effective suppression of environment-induced errors with increasing system size.
  • This work provides a foundation for building large-scale superconducting quantum computers.
  • Highlights the importance of QEC in overcoming experimental challenges in quantum computing.