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We showcase recent developments in improving coherence times of superconducting qubits at IQM Quantum Computers. We demonstrate how optimized fabrication and design result in increases in coherence times, enabling enhanced performance when integrated into quantum processing units (QPUs). We also report current efforts to mitigate the detrimental effects on coherence of remaining two-level-system (TLS) defects. Our results showcase state-of-the-art fabrication capabilities at IQM Quantum Computers, exhibiting \(T_1\) and \(T_{2}\) echo times up to the millisecond level in test devices. These improvements, when applied to QPU-compliant designs and combined with IQM’s quantum computer control software stack, yield consistently improved performance, enabling increased gate fidelities and paving the way to building fault-tolerant quantum computers.

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Coherence Development at IQM Quantum Computers

  • 会议论文

  • 发表日期：

    2026年

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  • Matthew Steggles,
  • Arthur Rebello,
  • Ivan Takmakov,
  • Andrew Guthrie,
  • Lihuang Zhu,
  • Azad Karis,
  • Alejandro Gómez-Frieiro,
  • Tuomas Mylläri,
  • Eelis Takala,
  • Leonid Abdurakhimov,
  • Juha Hassel

摘要

We showcase recent developments in improving coherence times of superconducting qubits at IQM Quantum Computers. We demonstrate how optimized fabrication and design result in increases in coherence times, enabling enhanced performance when integrated into quantum processing units (QPUs). We also report current efforts to mitigate the detrimental effects on coherence of remaining two-level-system (TLS) defects. Our results showcase state-of-the-art fabrication capabilities at IQM Quantum Computers, exhibiting \(T_1\) and \(T_{2}\) echo times up to the millisecond level in test devices. These improvements, when applied to QPU-compliant designs and combined with IQM’s quantum computer control software stack, yield consistently improved performance, enabling increased gate fidelities and paving the way to building fault-tolerant quantum computers.