发表机构
Department of Physics, Faculty of Science, University of Hormozgan（霍尔木兹甘大学理学院物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过数值精确主方程，揭示共享耗散腔的驱动类型决定两量子比特关联形式，参数驱动可产生无纠缠的量子失协，特定时间调制参数驱动能产生可被温度破坏的纠缠，且参数驱动对单量子比特相干性保护最优。
AI 中文摘要
我们采用数值精确的主方程方法，证明了仅通过一个共享的阻尼受驱动腔耦合的两个量子比特可以产生关联。驱动会影响关联的量和类型：对于参数驱动、相干驱动和谐振调制驱动，量子比特会产生随腔温度升高而增大的量子失协，而对数负性在数值上始终为零，这表明存在无纠缠的量子失协。相比之下，仅时间调制的参数驱动能产生真实的两量子比特纠缠，在(ε, γ)=(0.3, 0.2)时，对数负性E_N≈0.15，并发度≈0.16；在弱耦合、中等阻尼区域，E_N可升至≈0.32。当热光子数n_th≈0.2时，加热最终会破坏该纠缠，而量子失协持续增长，导致在单一驱动下发生由温度驱动的从纠缠到失协的转变。此外，参数驱动对单量子比特相干性的保护效果最佳，这与相干驱动和调制驱动不同。绝热消除模型表明，腔会产生有效耦合和集体退相位通道，两者均随温度升高而增大，这解释了观测到的无纠缠量子失协现象。
英文摘要
Using a numerically exact master equation, we demonstrate that two qubits, coupled solely through a shared damped, driven cavity, can become correlated. The drive influences both the amount and the type of correlation. For parametric, coherent, and resonantly modulated drives, the qubits develop quantum discord that increases with cavity temperature, while the logarithmic negativity remains numerically zero. This indicates the presence of discord without entanglement. In contrast, a time-modulated parametric drive is the only one that generates genuine two-qubit entanglement, achieving \(E_\mathcal{N} \simeq 0.15\) and concurrence \(\simeq 0.16\) at \((\eps, γ) = (0.3, 0.2)\), which rises to \(E_\mathcal{N} \simeq 0.32\) in the weak-coupling, moderate-damping region. Heating eventually destroys this entanglement around \(n_{\mathrm{th}} \simeq 0.2\), while discord continues to grow, resulting in a temperature-driven transition from entanglement to discord within a single drive. Moreover, the parametric drive offers the best protection for single-qubit coherence, unlike the coherent and modulated drives. An adiabatic-elimination model indicates that the cavity generates an effective coupling and a collective dephasing channel, both of which increase with temperature, explaining the observed discord without entanglement.
