Few emitters in a cavity: from cooperative emission to individualization
Few emitters in a cavity: from cooperative emission to individualization
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DOI：
10.1088/1367-2630/13/9/093020
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发表时间：
2011-09-09
影响因子：
3.3
通讯作者：
Franca Santos, M.
中科院分区：
文献类型：
--
作者：
Auffeves, A.;Gerace, D.;Franca Santos, M.
我们研究了一个电磁谐振器耦合到由弱外部驱动的非相干泵浦的介观数量的两能级发射器所发射的场的时间相关性。我们求解了系统的主方程，以增加发射体数量和作为腔质量因子的函数，我们确定了三种主要的状态，这些状态以发射辐射的良好统计特性为特征。对于较小的腔衰率，发射事件是不相关的，并且发射场中的光子数量大于1，类似于腔内激光场的积累。在中等衰减速率下（与发射体-腔耦合相比），对于少数发射体，发射辐射的统计数据是聚集的，并且明显依赖于发射体数量的宇称。后一特性与发射体与腔模耦合介导的协同性有关，并讨论了其与稳态子辐射的关系。最后，在坏腔态下，恢复了单个发射体集合发射的典型情况。我们还分析了合作行为如何演变为纯减相的函数，这使我们能够恢复由独立发射器集合组成的经典源的情况，类似于非常漏腔的情况。最先进的谐振腔q开关技术，结合最近调谐单个发射器进入和退出共振的能力，表明该系统是不同量子态光的通用源。
We study the temporal correlations of the field emitted by an electromagnetic resonator coupled to a mesoscopic number of two-level emitters that are incoherently pumped by a weak external drive. We solve the master equation of the system for increasing number of emitters and as a function of the cavity quality factor, and we identify three main regimes characterized by well-distinguished statistical properties of the emitted radiation. For small cavity decay rates, the emission events are uncorrelated and the number of photons in the emitted field becomes larger than one, resembling the buildup of a laser field inside the cavity. At intermediate decay rates (as compared with the emitter-cavity coupling) and for a few emitters, the statistics of the emitted radiation is bunched and strikingly dependent on the parity of the number of emitters. The latter property is related to the cooperativity of the emitters mediated by their coupling to the cavity mode, and its connection with steady-state subradiance is discussed. Finally, in the bad cavity regime the typical situation of emission from a collection of individual emitters is recovered. We also analyze how the cooperative behavior evolves as a function of pure dephasing, which allows us to recover the case of a classical source made of an ensemble of independent emitters, similar to what is obtained for a very leaky cavity. State-of-the-art techniques of Q-switch of resonant cavities, allied with the recent capability of tuning single emitters in and out of resonance, suggest this system to be a versatile source of different quantum states of light.