论文标题
量子时间成像的模态方法
A modal approach to quantum temporal imaging
论文作者
论文摘要
在时间镜头通过总和频率生成非线性过程实现的情况下，我们考虑量子时间成像的问题，特别是当设备接近100％转换效率时。在一般情况下，时间镜头还提出有限的光圈和不完美的相位匹配相关的功绩数字，例如时间分辨率，没有明确的表达式。结果，很难评估成像方案的性能。对这些优点数字的可靠估计尤其重要，因为它们可能与通常在经典时间成像中通常考虑的低转化效率的状态显着不同。我们表明，可以根据成像方案的本征码来解决这个问题，并展示如何从成像方案的模态描述中提取其相关的功绩数字。结果，我们获得了允许设计成像方案的标准，并接近统一效率。
We consider the problem of quantum temporal imaging in the case where the time lens is implemented by a Sum Frequency Generation nonlinear process, in particular when the device is operated close to 100% conversion efficiency. In the general case where the time lens also presents a finite aperture and a non-perfect phase-matching the relevant figures of merit, as for example the temporal resolution, do not have an explicit expression. As a consequence, the performances of imaging scheme are difficult to assess. Having a reliable estimation of these figures of merits is particularly important because they can be significantly different from the regime of low conversion efficiency usually considered in classical temporal imaging. We show that this problem can be approached in terms of the eigenmodes of the imaging scheme and we show how its relevant figures of merit can be extracted from the modal description of the imaging scheme. As a consequence we obtain criteria allowing to design imaging schemes with close to unity efficiencies.
