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<p>The quantum speed-limit (QSL) time of a single superconducting qubit subject to pure dephasing by bistable random telegraph noise (RTN) is examined. Non-Markovianity is quantified using a coherence-based measure, and the unified QSL time for mixed initial states introduced in <a href="https://doi.org/10.1103/PhysRevA.98.042132">Phys. Rev. A <b>98</b>, 042132 (2018)</a> is employed. The results show that the switching rate, coupling strength, and RTN initialization govern the transition between Markovian and non-Markovian dynamics. At equilibrium, memory effects shorten the QSL time via information backflow, whereas under non-equilibrium initializations the dynamics remain Markovian; nevertheless, strong coupling still accelerates the evolution through enhanced dephasing.</p>

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Quantum Speed Limits in Qubit Dynamics Driven by Bistable Random Telegraph Noise: From Markovian to Non-Markovian Regimes

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Maryam Hadipour

摘要

The quantum speed-limit (QSL) time of a single superconducting qubit subject to pure dephasing by bistable random telegraph noise (RTN) is examined. Non-Markovianity is quantified using a coherence-based measure, and the unified QSL time for mixed initial states introduced in Phys. Rev. A 98, 042132 (2018) is employed. The results show that the switching rate, coupling strength, and RTN initialization govern the transition between Markovian and non-Markovian dynamics. At equilibrium, memory effects shorten the QSL time via information backflow, whereas under non-equilibrium initializations the dynamics remain Markovian; nevertheless, strong coupling still accelerates the evolution through enhanced dephasing.