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-偏振子凝聚体作为非高斯光的来源。具体地说，有三个子目标：(I)探索参数空间和优化模型参数(Ii)简化先前工作的原理(Iii)从偏振子寻找非高斯光的应用。这最初是一个为期两年的项目，目标(I)和(Ii)在第一年完成，目标(Iii)在第二年完成。截至2015年1月，我已经搬到纽约大学上海校区中国，因此我在第一年年底终止了该项目。我们已经完成了目标(I)和目标(II)，并改进了产生非高斯光的方案。AIM(III)还没有完成，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。一种是首先产生激子--极化子，另一种是固定位相以避免位相扩散--这完全破坏了我们试图创造的效果。我们成功地将其简化为单一激光器，这不仅简化了实验设置，而且使产生过程变得更加简单。然而，仍然需要一种定相机制，这是通过另一种方式来实现的，即通过反馈零差电流来实现。我们发现，这比我们以前的方案提供了更强的非高斯光，极大地提高了性能。

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.