少数发射体极限下的连续准能量坍缩与光子阻塞破缺
Successive quasienergy collapse and breakdown of photon blockade in the few-emitter limit
AI总结：
本文研究受驱耗散 Tavis–Cummings 模型的少数发射体极限，揭示缀饰态准能量的分阶段坍缩及光-物质相关性导致的相变点偏移与宇称破缺态增多。
摘要：
随尺寸增大的多体系统中出现的涌现行为遵循普遍规律，这些规律在有序到无序的转变中变得明显。虽然这种行为传统上是针对大量发射体研究的，但近期进展使探索少数发射体极限成为可能；在该极限下，相关性可以被测量并与微观模型联系起来，从而进一步认识有序到无序的转变。我们在受驱且耗散的 Tavis–Cummings 模型中探索这一少体极限，该模型描述一组原子与一个受驱且耗散的腔模之间的相互作用。我们的探索围绕原子系综与光场的缀饰态展开；结果表明，随着驱动场增强，这些态的能量发生坍缩，标志着耗散量子相变的开始。这种坍缩分阶段发生，是光与物质相关性的效应；对于单个原子，这种相关性会被忽略，而在平均场模型中也未被考虑。文中给出了这些相关性对系统宏观可观测量的影响。我们发现，预期的转变点发生偏移，并且一旦进入有序相，可供选择的宇称破缺态数量增加。
英文摘要：
The emergent behavior that arises in many-body systems of increasing size follows universal laws that become apparent in order-to-disorder transitions. While this behavior has been traditionally studied for large numbers of emitters, recent progress allows for the exploration of the few-emitter limit, where correlations can be measured and connected to microscopic models to gain further insight into order-to-disorder transitions. We explore this few-body limit in the driven and damped Tavis--Cummings model, which describes a collection of atoms interacting with a driven and damped cavity mode. Our exploration revolves around the dressed states of the atomic ensemble and field, whose energies are shown to collapse as the driving field is increased to mark the onset of a dissipative quantum phase transition. The collapse occurs in stages and is an effect of light-matter correlations that are overlooked for single atoms and neglected in mean-field models. The implications of these correlations over the macroscopic observables of the system are presented. We encounter a shift in the expected transition point and an increased number of parity-broken states to choose from once the ordered phase is reached.
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