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1 results

  • 6 - Quantum Decoherence

  • Yidun Wan, Fudan University, Shanghai
  • Book:
    Quantum Computing Unveiled
    Published online:
    27 February 2026
    Print publication:
    19 March 2026, pp 160-192

  • Summary

    This chapter examines quantum decoherence, a process by which quantum information is lost due to environmental interactions. Various noise channels, such as bit-flip, phase-flip, and depolarizing channels, are discussed to illustrate common errors in qubit states. The Kraus representation and Lindblad equation offer frameworks for modeling these interactions. Metrics such as T1 (relaxation time) and T2 (decoherence time) are introduced to measure qubit stability. Understanding decoherence mechanisms is critical for developing strategies to preserve quantum information, laying the groundwork for quantum error correction techniques and highlighting the challenges in creating reliable quantum systems.