Using Spatial Correlations of SPDC Sources for Increasing the Signal to Noise Ratio in Images

Quantum Fest 2016 International Conference on Quantum Phenomena, Quantum Control and Quantum Optics

Ruíz, A.I.^1 ; Caudillo, R.^1 ; Velázquez, V.M.^1 ; Barrios, E.^1

Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, México

D.F. 04510, Mexico^1

关键词: Experimental set up;    High-contrast images;    Laser lights;    Low noise;    Photon pairs;    SIMPLE method;    Spatial correlations;    Spontaneous parametric down conversion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/839/1/012025/pdf
DOI  :  10.1088/1742-6596/839/1/012025

来源: IOP

【 摘 要 】

We experimentally show that, by using spatial correlations of photon pairs produced by Spontaneous Parametric Down-Conversion, it is possible to increase the Signal to Noise Ratio in images of objects illuminated with those photons; in comparison, objects illuminated with light from a laser present a minor ratio. Our simple experimental set-up was capable to produce an average improvement in signal to noise ratio of 11dB of Parametric Down-Converted light over laser light. This simple method can be easily implemented for obtaining high contrast images of faint objects and for transmitting information with low noise.