Extracting spatial information from noise measurements of multi-spatial-mode quantum states
Extracting spatial information from noise measurements of multi-spatial-mode quantum states
复制标题
从多空间模式量子态的噪声测量中提取空间信息
DOI：
10.1140/epjd/e2012-30037-1
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
P. Lett
中科院分区：
文献类型：
--
作者：
A. Marino;J. Clark;Q. Glorieux;P. Lett
摘要
Abstract
We show that it is possible to use the spatial quantum correlations present in twin beams to extract information about the shape of a binary amplitude mask in the path of one of the beams. The scheme, based on noise measurements through homodyne detection, is useful in the regime where the number of photons is low enough that direct detection with a photodiode is difficult but high enough that photon counting is not an option. We find that under some conditions the use of quantum states of light leads to an enhancement of the sensitivity in the estimation of the shape of the mask over what can be achieved with a classical state with equivalent properties (mean photon flux and noise properties). In addition, we show that the level of enhancement that is obtained is a result of the quantum correlations and cannot be explained with only classical correlations.