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Resisting High-Energy Impact Events through Gap Engineering in Superconducting Qubit Arrays.

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Gap engineering in superconducting qubits prevents correlated errors caused by high-energy impacts. This technique enhances quantum error correction (QEC) robustness, paving the way for more reliable quantum computing.

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Area of Science:

  • Quantum Computing
  • Superconducting Qubits
  • Materials Science

Background:

  • Quantum error correction (QEC) relies on uncorrelated errors for fault-tolerant quantum computing.
  • Superconducting qubits are vulnerable to correlated errors induced by high-energy impacts and quasiparticle (QP) tunneling.
  • Phonon propagation after impacts increases QP density, leading to correlated qubit errors.

Purpose of the Study:

  • To investigate the effectiveness of superconducting gap engineering in mitigating correlated errors in transmon qubits.
  • To assess the impact of high-energy events and optical illumination on qubits with varying gap engineering.

Main Methods:

  • Fabrication of all-aluminum transmon qubits with both strong and weak superconducting gap engineering on a single substrate.
  • Exposure of qubits to high-energy impact events and varying optical illumination intensities.
  • Measurement of qubit coherence times (T1) and error rates under different conditions.

Main Results:

  • Strongly gap engineered qubits showed no degradation in T1 during impact events.
  • Weakly gap engineered qubits exhibited correlated T1 degradation following impacts.
  • Strongly gap engineered qubits demonstrated robustness against QP poisoning from optical illumination, unlike weakly engineered qubits.

Conclusions:

  • Superconducting gap engineering effectively mitigates correlated errors induced by high-energy impacts and QP tunneling.
  • This approach enhances the resilience of superconducting qubits to environmental disturbances.
  • Gap engineering is a promising strategy for improving the reliability of quantum error correction in superconducting quantum computers.