AI 中文总结
研究在强光-物质耦合中发现两种双光子阻塞，弱TPB在级联通道关闭时出现，提取级联跃迁率定律，揭示弱非谐性和谐振驱动相互作用是弱TPB形成机制，为量子技术开发提供新思路。
AI 中文摘要
我们报告了在奇偶性破缺的广义量子拉比模型的强耦合区域中发现的一种独特的双光子阻塞（称为弱TPB），此外在超强耦合（USC）区域中还有另一种双光子阻塞（称为强TPB）。与传统上具有开放级联衰变通道的强TPB不同，弱TPB相在级联衰变通道关闭的情况下非常规地出现。奇偶性破缺原本允许打开的级联通道的关闭是出乎意料的，其在强TPB区域的打开实际上被延迟了。我们提取了级联跃迁率的立方定律，该定律解释了两个TPB区域中级联通道的抑制和延迟打开。此外，我们发现级联态上的粒子数在强TPB中至关重要，而在弱TPB中则相反地起次要作用。相反，对于弱TPB来说，级联之上的上态是相关的。我们证明弱非谐性和谐振驱动的相互作用是上态粒子数和弱TPB形成的主要机制。我们的分析不仅为不同TPB的本质提供了更深入的见解，还暗示了多光子阻塞的机制和操纵多样性，这可能为在单个量子的操纵层面上开发量子技术开辟更多途径。
英文摘要
We report a distinct two-photon blockade (termed as weak TPB) discovered in the strong-coupling regime of a parity-broken generalized quantum Rabi model, in addition to the other two-photon blockade (termed as strong TPB) in the ultrastrong coupling (USC) regime. In contrast to the strong TPB conventionally with opened cascade decay channel, the weak TPB phase emerges unconventionally with closed cascade decay channel. The closure of cascade channel originally allowed to open by parity breaking is unexpected and its opening in the strong-TPB regime is actually delayed. We extract a cubic law for the cascade transition rate that accounts for the suppression of cascade channel and the delayed opening in the two TPB regimes. Furthermore, we find that the population on the cascade state, which is crucial in the strong TPB, contrarily plays a minor role in the weak TPB. Instead, it is the upper state above the cascade that is relevant for the weak TPB. We demonstrate that the interplay of weak anharmonicity and resonant driving is the primary mechanism responsible for the upper-state population and the formation of weak TPB. Our analyses not only provide deeper insights into the nature of different TPBs, but also imply mechanism and manipulation diversities for the multi-photon blockade, which may open more avenues for developing quantum technologies on the manipulation level of individual quanta.
Comments16 pages, 8 figures
