弗洛奎特分辨耗散选择超越布居谱的纠缠
Floquet-Resolved Dissipation Selects Entanglement Beyond Population Spectroscopy
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中文总结 AI 辅助
该研究针对周期驱动量子器件，对比PHDA与FBM两种耗散描述，发现布居相似但纠缠特性差异显著，确立相干性敏感可观测量为量子态工程的关键验证基准。
中文摘要 AI 辅助
在周期驱动器件中实现可靠的量子态工程，仅重现其激发谱是不够的，环境还必须分辨驱动系统的跃迁。我们表明，参数耦合量子比特的两种耗散描述，可产生极为相似的周期平均布居，却呈现出定性不同的渐近纠缠。两种描述均保留了完整的周期驱动哈密顿量、相同的微观浴耦合以及相同的物理可观测量；它们的差异在于用于分辨耗散通道的动力学表示及对应的系统算符：部分谐波分解方法（PHDA）中的静态缀饰基，以及弗洛奎特-玻恩-马尔可夫（FBM）理论中包含所有相关驱动边带的弗洛奎特基。布居图保留了相同的共振骨架，且在从低到中等的宽驱动区域内仍极为相似，而随着调制增强，差异会变得更明显。相位分辨的单量子比特和两量子比特相干性可观测量，揭示了振幅与相位的显著重分布。并发度放大了这种隐藏的态水平差异：弗洛奎特分辨耗散选择了更强、更扩展的类贝尔纠缠区域，以及与固定类贝尔参考的更大重叠，而PHDA通常低估了纠缠及其热持续性。通道分辨测试验证了在相关参数域内完全正定的FBM构造。我们的结果确立，布居一致性并非开放弗洛奎特量子态工程的充分基准，并确定相干性敏感可观测量是决定性的验证测试。
英文摘要
Reliable quantum-state engineering in periodically driven devices requires more than reproducing their excitation spectrum: the environment must resolve the transitions of the driven system. We show that two dissipative descriptions of the same parametrically coupled qubits can yield closely similar period-averaged populations yet qualitatively different asymptotic entanglement. Both retain the complete periodically driven Hamiltonian, the same microscopic bath couplings, and the same physical observables; they differ in the dynamical representation used to resolve the dissipative channels and the corresponding system operators: the static dressed basis in the partial harmonic decomposition approach (PHDA) and the Floquet basis, including all relevant drive sidebands, in Floquet-Born-Markov (FBM) theory. The population maps preserve the same resonance skeleton and remain closely similar over broad low-to-moderate drive regions, while clearer differences emerge as the modulation becomes stronger. Phase-resolved single- and two-qubit coherence observables reveal a substantially stronger redistribution of amplitudes and phases. Concurrence amplifies this hidden state-level discrepancy: Floquet-resolved dissipation selects stronger and more extended Bell-like entangled regions and a larger overlap with a fixed Bell-like reference, while PHDA generally underestimates the entanglement and its thermal persistence. A channel-resolution test verifies the secular, completely positive FBM construction throughout the relevant parameter domain. Our results establish population agreement as an insufficient benchmark for open Floquet quantum-state engineering and identify coherence-sensitive observables as the decisive validation test.
