Generation of negative Wigner function light using using exciton-polariton condensates

该提案的主要目的是研究使用激子-极化子凝聚体作为非高斯光源。具体来说，有3个子目标：(1)参数空间的探索和模型参数的优化；(2)前人工作原理的简化；(3)寻找极化非高斯光的应用。该项目最初计划为期两年，目标(I)和（II）在第一年完成，目标（III）在第二年完成。2015年1月，我已经搬到了纽约大学中国上海校区，因此我在第一年结束时终止了这个项目。我们完成了目标(I)和（II），并改进了产生非高斯光的方案。Aim （III）尚未完成，需要更多的工作来完成项目的这一方面。在我们之前的方案中，需要两个激光器来产生非高斯光。一个是为了首先产生激子极化，另一个是为了固定相位以避免相位扩散——这完全破坏了我们想要创造的效果。我们成功地将其减少到一个激光器，这不仅简化了实验设置，而且使生成过程更加直接。然而，相位固定机制仍然是必要的，这是通过另一种方式完成的，通过反馈一个纯差电流。我们发现这比我们以前的方案提供了更强的非高斯光，大大提高了性能。

The main aim of the proposal was to investigate using exciton-polariton condensates as a source of non-Gaussian light. Specifically, there were 3 sub-aims that were targeted: (I)Exploration of parameter space and optimization of model parameters (II)Simplification of the principle of the previous work (III)Finding applications of non-Gaussian light from polaritons.This was originally planned as a two-year project, with aims (I) and (II) being completed in the first year, and aim (III) being completed in the second year. As of January 2015, I have now relocated to New York University's Shanghai campus in China, hence I terminated the project at the end of the first year. We have completed aims (I) and (II) and refined our scheme for producing non-Gaussian light. Aim (III) was not completed, and requires more work to complete that aspect of the project.In our previous scheme, two lasers were necessary to generate the non-Gaussian light. One for creating the exciton-polaritons in the first place, and another to fix the phase to avoid phase diffusion -- this completely destroys the effect that we are trying to create. We were successful in reducing this to a single laser, which not only simplifies the experimental setup, but makes the generation process much more straightforward. However, a phase fixing mechanism is still necessary, which is accomplished by another means, by feeding back a homodyne current. We found that this gives much stronger non-Gaussian light than our previous scheme, improving the performance greatly.